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Articles 2161 - 2190 of 302419

Full-Text Articles in Physical Sciences and Mathematics

The Potential Of Winter Rye Cultivars In The Gauteng Province Of South Africa, C C. Botha, N.F. G. Rethman Jun 2024

The Potential Of Winter Rye Cultivars In The Gauteng Province Of South Africa, C C. Botha, N.F. G. Rethman

IGC Proceedings (1993-2023)

Trials were conducted at the Hatfield Experimental Farm to evaluate eight rye cultivars (Secale cereale) in terms of production and development during different seasons. These consisted of a pot experiment, comparing two water regimes, and a field trial, comprising different planting dates, in order to observe phenological development. SSR 729, a South African winter rye, and imported cultivars compared favourably with the traditional cultivars. The winter rye cultivars are good substitutes for the “old” cultivars for the production of green forage in the autumn/winter period.

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Analysis Of Pasture Management Practices Within A Pasture Composition Matrix Model, D R. Kemp, D L. Michalk, P M. Dowling, T A. Klein Jun 2024

Analysis Of Pasture Management Practices Within A Pasture Composition Matrix Model, D R. Kemp, D L. Michalk, P M. Dowling, T A. Klein

IGC Proceedings (1993-2023)

In extensive livestock industries better pasture management is seen as the main strategy to improve poor quality pastures, or to maintain newly sown ones. Pasture management practices need to be evaluated within a framework that considers the desirability of changes in species composition rather than simply considering the statistical significance of the results. This can be done through the state and transition model used in rangelands management, but difficulties were found when applying that model to temperate perennial pastures as the interactions between species often showed continuous distributions. An alternative pasture composition matrix model based on the ratios of functional …

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Productivity Of Silphium Perfoliatum L. In Low Input Agricultural Systems, G Pichard, R Cussen, F Moore Jun 2024

Productivity Of Silphium Perfoliatum L. In Low Input Agricultural Systems, G Pichard, R Cussen, F Moore

IGC Proceedings (1993-2023)

There is a large area in the coastal region of southern Chile affected by low productivity of soils and severe climatic limitations, which is owned mainly by small farmers. This research was conducted with dairy farmers producing an average of 20,000 liters/year whose main problem is cattle underfeeding because of severe seasonal cycles in pasture growth and extended overgrazing of natural grasslands of low production potential. Silphium perfoliatum L. is a perennial forage species that grows well during the summer period when grasslands have stopped their growth due to moisture stress and high temperatures. Based on the agronomic results and …

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Dry Matter Production And Nutritive Value Of Forage Of Digitaria Eriantha Cv. Irene In Two Locations Of The Central Semi-Arid Region Of Argentina, C A. Frasinelli, H J. Petruzzi, J H. Veneciano, C M. Ferri, V V. Jouve, N P. Stritzler, O A. Terenti Jun 2024

Dry Matter Production And Nutritive Value Of Forage Of Digitaria Eriantha Cv. Irene In Two Locations Of The Central Semi-Arid Region Of Argentina, C A. Frasinelli, H J. Petruzzi, J H. Veneciano, C M. Ferri, V V. Jouve, N P. Stritzler, O A. Terenti

IGC Proceedings (1993-2023)

The aim of this experiment was to compare dry matter (DM) production rates and nutritive value of a warm-season grass, Digitaria eriantha cv. Irene, in two locations of Central Argentina, Santa Rosa (SR) and Villa Mercedes (VM). The plants were established in two identical groups of plots, within a randomized block design. DM rates were calculated from serial, out of phase clippings, and in vitro dry matter digestibility (IVDMD) and crude protein (CP) content analyzed on subsamples. The study lasted for three consecutive growing seasons. Results showed that DM production rates were generally higher (P<0.05) in SR than in VM, but IVDMD and CP content showed no clear trends between both locations. DM production tended to lower from year 1 to 3, related to processes of N depletion from soils (VM) and diminishing rainfall (SR). It is concluded that D.eriantha is a very promising warm-season grass to Central Argentina. Data of nutritive value obtained in one location can be used in others, but results of DM production rates should be taken under the conditions where they will be used.

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Pasture Species For Grazing-Based Dairy Production Under Irrigated In The Intermountain West, J W. Macadam, R E. Whitesides, M B. Winger, S Buffler Jun 2024

Pasture Species For Grazing-Based Dairy Production Under Irrigated In The Intermountain West, J W. Macadam, R E. Whitesides, M B. Winger, S Buffler

IGC Proceedings (1993-2023)

Forage trials were established in response to producer interest in grazing-based dairy production. The quantity and seasonal distribution of yield of tall fescue (Festuca arundinacea Schreb.), orchardgrass (Dactylis glomerata L.), white clover (Trifolium repens var. giganteum L.), birdsfoot trefoil (Lotus corniculatus L.), and cicer milkvetch (Astragalus cicer L.) harvested three times were similar, with about half the production occurring in June. Legume quality was higher in June, and quality for all species was highest in late summer. Yields of perennial ryegrass (Lolium perenne L.), meadow bromegrass (Bromus riparius Rehm.) and Kentucky bluegrass (Poa pratensis …

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Interpreting Guineagrass Behaviour Under Different Clipping, Nitrogen And Irradiance Regimesa, A Paez, M E. Gonzalez, L Villavicencio, A Salazar, D Tissue Jun 2024

Interpreting Guineagrass Behaviour Under Different Clipping, Nitrogen And Irradiance Regimesa, A Paez, M E. Gonzalez, L Villavicencio, A Salazar, D Tissue

IGC Proceedings (1993-2023)

An increase in the photosynthetic rate of the remaining tissues or regrowth has been proposed to explain compensatory growth after defoliation. In fact, we observed this effect in guineagrass, but it was not solely related to higher stomatal conductance. Nitrogen and irradiance may influence this response in the field, interacting with clipping. The objective of this research was to determine if these factors alter photosynthesis of intensively clipped well-watered guineagrass. Plants grown in a soil mixture were placed in the shade and in full sunlight. After establishment, some plants in each irradiance were clipped monthly at 20-cm, and the others …

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Separate Harvest Of Leaves From The Stems Of Lucerne Stands, L Schmidt Jun 2024

Separate Harvest Of Leaves From The Stems Of Lucerne Stands, L Schmidt

IGC Proceedings (1993-2023)

Lucerne leaves have significantly higher crude protein and lower crude fibre contents than the stems. The present methods for separating the leaves from the stems have serious deficiencies. Early harvesting, for example, weakens the lucerne stand, and sifting after artificial drying impairs quality. Above that, preparation of leaf protein concentrates is rather expensive. Field trials with a pronged cylinder which strips the leaves from the stems produced leaf yields of ž 80 % with a stem portion of £ 15 % (containing ž 26 % crude protein and £ 18 % crude fibre in the dry matter). Lucerne leaves can …

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Persistence Of Contrasting Perennial Ryegrass- White Clover Mixtures At Two Defoliation Frequencies, A Elgersma, H Schlepers Jun 2024

Persistence Of Contrasting Perennial Ryegrass- White Clover Mixtures At Two Defoliation Frequencies, A Elgersma, H Schlepers

IGC Proceedings (1993-2023)

Mixtures of two cultivars of perennial ryegrass with contrasting growth habits and three white clover cultivars differing in leaf sizes were evaluated at two cutting frequencies to study white clover persistence. A trial was sown in 1991 on a clay soil. The plots received no nitrogen fertilizer. Throughout the years, mixtures with the large-leaved clover cv. Alice yielded significantly more herbage dry matter and had a higher clover content than mixtures with cvs. Gwenda and Retor. Companion grass cultivar did not consistently affect yield, nor botanical composition. Cutting at 2 t DM ha-1 resulted in slightly higher total annual yields …

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Species Composition And Forage Quality Of Birdsfoot Trefoil (Lotus Corniculatus L.) - Grass Mixtures, L J. Greub, D J. Undersander Jun 2024

Species Composition And Forage Quality Of Birdsfoot Trefoil (Lotus Corniculatus L.) - Grass Mixtures, L J. Greub, D J. Undersander

IGC Proceedings (1993-2023)

This study compares yield, species composition, and forage quality of binary mixtures of two birdsfoot trefoil cultivars (‘Witt’ and ‘Dawn’) and six cool-season forage grasses. Stands were established by no-till seeding into glyphosate killed pasture sod in May and in August. Heavy autumn dandelion (Taraxacum officinale Weber) competition reduced trefoil survival in August seedings. The proportion of trefoil in the herbage varied widely but in spring-seeded seeding year stands it was always highest with Kentucky bluegrass (maximum of 740 g kg-1, first harvest, 1994) and usually lowest (107 g kg-1 or less) with perennial ryegrass, reed canarygrass, or orchardgrass. …

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Winter-Hardiness And Pasture Productivity Of Some White Clover Cultivars In New York, H D. Karsten, G W. Fick Jun 2024

Winter-Hardiness And Pasture Productivity Of Some White Clover Cultivars In New York, H D. Karsten, G W. Fick

IGC Proceedings (1993-2023)

California Ladino (Ladino) the recommended white clover (Trifolium repens L.) cultivar, was compared to ‘Milkanova’, ‘Ranger’, and ‘Will’ from 1994 to 1996 on a dairy farm in New York. Each cultivar was represented by clones of 40 different mother plants in four blocks. Within each block for each cultivar, individuals from ten different mother plants were planted in seven 1m rows. To compare the cultivars, stolon density, growing point density, stolon starch and sugar concentrations, and plants/m were measured in autumn and spring. During the growing season rows were visually rated and aboveground biomass was sampled to estimate yield. Stolon …

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Evaluation Of Grassland Advance Tall Fescue Under Grazing, R.J M. Hay, T B. Lyons, H S. Easton Jun 2024

Evaluation Of Grassland Advance Tall Fescue Under Grazing, R.J M. Hay, T B. Lyons, H S. Easton

IGC Proceedings (1993-2023)

Four cultivars of tall fescue (Festuca arundinacea Schreb.) were evaluated under sheep grazing at Palmerston North, New Zealand to assess the productivity and persistence of the newly released cultivar Grasslands Advance. Results from four years under grazing showed Grasslands Advance to be a considerable improvement over the older cultivar Grasslands Roa in both total sward yield and in dry matter contribution of tall fescue. It outperformed the other three cultivars in years 2 and 3 and was not significantly different to Grasslands Roa and AU Triumph in year 1 or AU Triumph in year 4. Seasonal production was excellent …

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Evaluation Of Five Bahiagrass Cultivars In Southwest Florida, R M. Muchovej, J J. Mullahey Jun 2024

Evaluation Of Five Bahiagrass Cultivars In Southwest Florida, R M. Muchovej, J J. Mullahey

IGC Proceedings (1993-2023)

Bahiagrass, mostly of the cultivar Pensacola, is the predominant grass in Florida and occupies two million hectares of the five million currently under pastures in the state. Several other cultivars exist and are available to ranchers through seed producing companies. This study compares five cultivars of bahiagrass (T-9, Pensacola, Argentine, Paraguay, and T-7) with respect to dry matter yield, nitrogen content, and digestibility in Southwest Florida. Evaluations were made at intervals of approximately 35 days from late June to early December. Forage production was greatest for T-9; this variety produced 35% more forage than Pensacola. All varieties behaved similarly regarding …

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Possibilities Of Renovation On Hungarian Grassland, L Szeman Jun 2024

Possibilities Of Renovation On Hungarian Grassland, L Szeman

IGC Proceedings (1993-2023)

The object of renovation was to increase the production of run-down permanent pastures by cultivation and by replanting good grasses. The experiment went on for four years on disked and ploughed areas, with pasture mix seed. Although fertilizer was not applied to the seedbed, 3 types of fertilizers were used every spring except on the control plots. The dry matter yield of the original pastoral flora decreased from 2.9 to 2.2 t/ha. On the fallow land it increased from 2 to 2.3 t/ha. When planted after disking, it increased from 2.1 to 6.1 t/ha and when planted after ploughing it …

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Defoliation Frequency And Intensity Of Arrhenathherum Elatius, G H. D'Angelo, E B. Postulka, L Ferrari Jun 2024

Defoliation Frequency And Intensity Of Arrhenathherum Elatius, G H. D'Angelo, E B. Postulka, L Ferrari

IGC Proceedings (1993-2023)

This experiment was conducted with the aim of studying whether the frequency and intensity of defoliation of the temperate grass fromental (Arrhenatherum elatius (L.) Presl.) affected its total dry matter (DM)/ha yield as well as the seasonal distribution of forage. Plots were seeded in 1988 and data collected from 1989 to 1991. Two frequencies and two intensities of defoliation were combined in a two factor randomized complete block design with six replications. Treatment plots were cut each year from early autumn to late spring. ANVA, Tukey and Dunnett tests were applied to find out differences between treatments and between …

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The Role Of Seeds Rate In Higher Persistence On Newly Established Meadows, P Golinski, S Kozlowski Jun 2024

The Role Of Seeds Rate In Higher Persistence On Newly Established Meadows, P Golinski, S Kozlowski

IGC Proceedings (1993-2023)

The paper presents results of a 7-year experiment concerning four mixtures applied for the renewal of meadows using the method of conventional tillage. The increase of the seed rate guarantees that the final composition of the obtained sward resembles the composition of species used in the sowing mixture and, what is equally important, this composition remains unchanged for a long period of utilization of meadows subjected to this method of renovation. Denser sowing restricts the appearance in the sward of species not used in the sowing mixture. Furthermore, it allows the development of a much more compact sward with a …

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Extending Utilization Of Georgia 5 Tall Fescue In The Lower Southeastern United States, R D. Lee, R N. Gates, J H. Bouton Jun 2024

Extending Utilization Of Georgia 5 Tall Fescue In The Lower Southeastern United States, R D. Lee, R N. Gates, J H. Bouton

IGC Proceedings (1993-2023)

In the southeastern United States, warm season perennial grasses such as bermudagrass (Cynodon dactylon [L.]Pers.) and bahiagrass (Paspalum notatum Flugge) predominate permanent pastures. During dormancy, winter annuals are either over-seeded on permanent pastures or grown on prepared seedbeds for winter pasturing of animals. In addition, cattlemen feed hay cut from warm-season grass production. Cattleman and hay producers have lacked a dependable perennial cool season grass that could be utilized in addition to or in place of winter annuals or hay. High temperatures, pests, droughty conditions and competition from warm season species undermine the persistence of cool season grasses. …

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Bermudagrass Pastures Under Long-Term Stocking Rates And Fertility Regimes, F M. Rouquette Jr, G R. Smith, V A. Haby Jun 2024

Bermudagrass Pastures Under Long-Term Stocking Rates And Fertility Regimes, F M. Rouquette Jr, G R. Smith, V A. Haby

IGC Proceedings (1993-2023)

After 16 years of grazing ‘Coastal’ and common bermudagrass [Cynodon dactylon (L.) Pers.] pastures each at 3 levels of forage mass, N vs non-N fertilizer was superimposed to assess stand maintenance of bermudagrass and cow-calf performance. After 7 additional years of fertility treatments, N plus overseeded ryegrass (Lolium multiflorum Lam.) provided for 202 days grazing; whereas, K plus overseeded clovers (Trifolium incarnatum L.) and (T. vesiculosum Savi.) provided adequate forage for 179 days grazing. Coastal supported higher stocking rates (2.3 to 7.9 680-kg animal units(AU)/ha) than common bermudagrass (2.0 to 5.3 AU/ha). Suckling calf daily gains …

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Using Planned Volunteer Crabgrass (Digitaria Spp.) In Doublecropping With Cool Season Annual Forages, R L. Dalrymple Jun 2024

Using Planned Volunteer Crabgrass (Digitaria Spp.) In Doublecropping With Cool Season Annual Forages, R L. Dalrymple

IGC Proceedings (1993-2023)

Crabgrass (Digitaria ciliaris Retz., D. sanguinalis (L.) Scop. and other species) is used as a real and planned forage. The major known use is in Oklahoma and about 19 other Southeast United States as a doublecropping or multicropping forage production approach whereby, crabgrass is the summer season forage and cool season annual grasses, with or without cool season legumes, are used as the winter season forage. High quality forage is thus produced up to over nine months of a year. Cereal rye (Secale cereale L.) and crabgrass doublecropping has produced up to over 10,000 pounds of grass per acre. Both …

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The Effect Of Ladino Clover Mixture With Some Grasses On Dm Yield, Botanical Compsosition And Season Nitrogen Activity, H W. Lee, C H. Kim Jun 2024

The Effect Of Ladino Clover Mixture With Some Grasses On Dm Yield, Botanical Compsosition And Season Nitrogen Activity, H W. Lee, C H. Kim

IGC Proceedings (1993-2023)

The effect of ladino clover mixture with some grasses on DM production, botanical composition and seasonal nitrogen fixation activity was examined under field conditions in two consecutive years. Treatment consisted of a clover mixture with four grasses and a reference crop which was grass grown alone. DM production of second year Perennial ryegrass, Tall fescue plus clover mixture was greater than plot growing grasses but almost the same as Timothy and Orchardgrass both with and without clover. Yield in the third year was higher than that of the clover mixture treatment. Ladino clover content was increased from 26% in 1992 …

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Effects Of Defoliation Frequency On The Persistency Of Oversown Temperate Legumes Into A Natural Pasture, J C. Millot, R A. Zanoniani, S Saldanha Jun 2024

Effects Of Defoliation Frequency On The Persistency Of Oversown Temperate Legumes Into A Natural Pasture, J C. Millot, R A. Zanoniani, S Saldanha

IGC Proceedings (1993-2023)

The objective of this study was to study the establishment dynamics and persistence of a legume mixture oversown into natural grasslands under five different grazing management systems. Topographic position had the most significant effect on establishment and persistence. The lowlands were the best sites for legume establishment and persistence. Two years of previous management changed the ground cover components affecting the germination pattern of introduced seeds. The more frequent grazing treatments increased the total number of established legumes and their persistence throughout five years of grazing in the lowlands. Legume persistence on the slopes was generally shorter and was optimized …

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Effect Of The Cutting Frequency On Yield, Crude Protein And Mineral Contents Of A Panicum Maximum/Centrosema Macrocarpum Mixture, J Faria-Marmol, D E. Morillo, R Gonzalez, Z Chirinos Jun 2024

Effect Of The Cutting Frequency On Yield, Crude Protein And Mineral Contents Of A Panicum Maximum/Centrosema Macrocarpum Mixture, J Faria-Marmol, D E. Morillo, R Gonzalez, Z Chirinos

IGC Proceedings (1993-2023)

Dry matter (DM) yield, crude protein (CP) and mineral composition of Panicum maximum-Centrosema macrocarpum association as affected by three cutting frequencies (28, 42 and 56 days) were compared in a tropical dry forest of Venezuela. No differences (P<0.05) among defoliation frequencies for any of the variables were detected. All mineral concentrations evaluated in Guineagrass (P. maximum) were considered adequate for grazing ruminants. In C. macrocarpum only P (0.24%) and N (0.08%) were close to critical level for deficiencies in ruminants. P. maximum-Centrosema macrocarpum mixture offered adequate levels for grazing ruminants for all nutrients evaluated.

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Effects Of Three Cutting Frequencies On Yield, Crude Protein And Mineral Contents Of Centrosema Macrocarpum, J Faria-Marmol, D E. Morillo, R Gonzalez, Z Chirinos Jun 2024

Effects Of Three Cutting Frequencies On Yield, Crude Protein And Mineral Contents Of Centrosema Macrocarpum, J Faria-Marmol, D E. Morillo, R Gonzalez, Z Chirinos

IGC Proceedings (1993-2023)

Dry matter (DM) yield, crude protein (CP) and mineral composition of Centrosema macrocarpum as affected by three cutting frequencies (28, 42 and 56 days) were compared in a tropical dry forest of Venezuela. DM yield and plant height were increased (P<0.05) by increasing the cutting intervals, whereas CP, ash and most minerals were not affected (P<0.05). Only P concentration declined (P<0.05) with increasing plant maturity. The lowest P concentration (0.18%) resulted from the longest cutting interval. Average CP concentration and mineral contents of C. macrocarpum were adequate with grazing ruminant requirements with exception of P (0.21%) and Na (0.073%).

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Effect Of The Cutting Frequency On Yield And Crude Protein And Mineral Contents Of Panicum Maximum, D E. Morillo, J Faria-Marmol, R Gonzalez Jun 2024

Effect Of The Cutting Frequency On Yield And Crude Protein And Mineral Contents Of Panicum Maximum, D E. Morillo, J Faria-Marmol, R Gonzalez

IGC Proceedings (1993-2023)

Dry matter yield per cutting and total production, crude protein content and mineral composition of Guineagrass (Panicum maximum Jacq.) as affected by three cutting frequencies (28, 42 and 56 days) were evaluated in a wet/dry tropical area in Venezuela. Only CP was affected (P<0.05) by the cutting frequency, decreasing (P<0.05) from 11.9 to 9.2 % as the harvest interval increased. Mean DM yield per cutting and accumulated over the 336-day experiment (661 and 5140 kg/ha) were low, probably due to low rainfall (600 mm) during the trial. Mean macro (%) and microelement (ppm) concentrations were: Ca, 0.9; P, 0.31; Mg, 0.45; K, 2,17; Na, 0.09; Cu, 11; Fe, 133 and Mn, 269, which were regarded as nutritionally adequate for grazing ruminants .

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Growth Curves And Herbage Quality Of Birdfoot Trefoil In Dryland Areas Of The Andes Foothills, H Acuna Jun 2024

Growth Curves And Herbage Quality Of Birdfoot Trefoil In Dryland Areas Of The Andes Foothills, H Acuna

IGC Proceedings (1993-2023)

The objectives of this study were to describe the growth curves and the herbage quality changes of birdfoot trefoil (Lotus corniculatus) during spring and early summer in the dryland areas of The Andes foothills. The DM accumulation, from different dates, was fitted to a logistic function, y = A/ 1 + b e-ax. The derivative of that function, dy/dx = Abaeax /(1 + be-ax )2 , allowed determination of the rates of growth. The curves show that the maximum accumulation was reached around mid December and the highest rates of growth were registered between 15 September and 15 November ( …

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Defoliation Effects On Digestible Dry Matter Yield Of Tall Wheatgrass, M A. Brizuela, S Laplace, M S. Cid Jun 2024

Defoliation Effects On Digestible Dry Matter Yield Of Tall Wheatgrass, M A. Brizuela, S Laplace, M S. Cid

IGC Proceedings (1993-2023)

The objective of our study was to assess the effect of four different defoliation frequencies upon the digestible dry matter (DDM) yield of tall wheatgrass (Thinopyrum ponticum) during the spring season in Balcarce, Buenos Aires province, Argentina. Four sets of three plots in a wheatgrass dominated pasture were defoliated every 7, 14, 21 and 28 days. Neither total pasture nor wheatgrass DM yields accumulated throughout the experimental period differed (p>0.05) among treatments. DMivD of wheatgrass declined (p<0.05) through time in all treatments. The accumulated DDM yield differed (p< 0.05) among treatments (F7=967.6b; F14= 1036.6ab; F21= 1167.6ab; F28= 1419.0a DDM kg ha-1). A 28 day defoliation frequency should be applied to tall wheatgrass to obtain the highest digestible dry matter yields.

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White Clover Versus Nitrogen Fertilizer 2. Sheep Production, J.P J. Erens, K B. Miller, R J. Lucas, J.G. H. White, H S. Easton Jun 2024

White Clover Versus Nitrogen Fertilizer 2. Sheep Production, J.P J. Erens, K B. Miller, R J. Lucas, J.G. H. White, H S. Easton

IGC Proceedings (1993-2023)

Animal production on pasture systems provided with either fertiliser or biological nitrogen was compared. A grazing experiment was sown at AgResearch Gore (46°07’ S; 168°54’ E) in October, 1989. Four ryegrass/white clover paddocks were compared to four ryegrass paddocks, with the latter receiving 270 kg nitrogen/ha/year. Each paddock of 0.5 ha was subdivided for rotational grazing at 20 ewes/ ha. In comparison to the ryegrass pastures, mixed pastures produced 22% more herbage and were subsequently 22% higher stocked, lamb liveweight gains were 12% higher during lactation and 42% higher after weaning resulting in earlier sale at higher carcass weights. Ewe …

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Perennial Cool-Season Grasses For The Warm Temperate Louisiana Coastal Plain, W D. Pitman Jun 2024

Perennial Cool-Season Grasses For The Warm Temperate Louisiana Coastal Plain, W D. Pitman

IGC Proceedings (1993-2023)

Despite a mild climate and relatively uniform distribution of rainfall, cool-season pastures in the Coastal Plain of the southeastern U.S. have been limited primarily to annual grasses and legumes. Preliminary evaluations indicated promise for the recently released cultivar, ‘Georgia-5’ tall fescue (Festuca arundinacea Schreb.), and an experimental Texas bluegrass (Poa arachnifera Torr.). Commercially available seed supplies allowed evaluation of the tall fescue at multiple sites, while the Texas bluegrass evaluation was limited by seed availability to a single small-plot experiment. Both site and management affected survival of the tall fescue sown into stands of warm-season grasses. Density of …

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Frequent Grazing By Sheep Reduced Caucasian Clover Cover And Rhizome Mass In Ryegrass Pasture, R J. Lucas, A.J E. Moorhead, W W. Nichol, P Jarvis Jun 2024

Frequent Grazing By Sheep Reduced Caucasian Clover Cover And Rhizome Mass In Ryegrass Pasture, R J. Lucas, A.J E. Moorhead, W W. Nichol, P Jarvis

IGC Proceedings (1993-2023)

The responses of hexaploid Caucasian clover (Trifolium ambiguum) to four contrasting grazing regimes were compared with white clover (T. repens ) in a high endophyte hybrid ryegrass pasture on a fertile lowland site. After two years, frequent grazing reduced Caucasian clover cover to 10% compared with 25.5% in infrequently grazed treatments (mean spelling time 25 days). Similarly, Caucasian clover rhizome plus root dry weight was reduced by frequent grazing (78 g DM/m2 sampled to 100 mm depth compared with 322 g DM/m2). White clover was encouraged by frequent defoliation (21% cover) in contrast to Caucasian clover. Ryegrass tiller …

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Agronomic Evaluation Of Novel Germplasm Under Grazing: Arachis Pintoi Bra-031143 And Paspalum Atratum Bra-009610, A O. Barcellos, E A. Pizarro, N L. Costa Jun 2024

Agronomic Evaluation Of Novel Germplasm Under Grazing: Arachis Pintoi Bra-031143 And Paspalum Atratum Bra-009610, A O. Barcellos, E A. Pizarro, N L. Costa

IGC Proceedings (1993-2023)

The effect of the animal on the pasture and their reverse consequence was studied on two replicated areas of 0.27 and 0.18 ha in a grasslegume sward established in a poorly humid drained soil in the Brazilian Cerrado. The A. pintoi BRA-031143 and P. atratum BRA- 009610 sward was evaluated during four consecutive years under two grazing pressures (GP). The imposed GP affected the botanical composition and pasture availability. Mean live weight gain/animal/ day under the two imposed GP varied from 387+17g, 578+68g, 697+35g and 687+123g between the 1992/93 and 1995/96 rainy seasons. During the dry season the LWG/animal/day varied …

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The Effect Of Glyphosate On Dm Yield And Quality Of Forage Sorghum, T Kipnis, Sofia Kaller, G Krivat, Levana Dvash, D Ben-Ghedalia Jun 2024

The Effect Of Glyphosate On Dm Yield And Quality Of Forage Sorghum, T Kipnis, Sofia Kaller, G Krivat, Levana Dvash, D Ben-Ghedalia

IGC Proceedings (1993-2023)

The possibility of improving the forage quality of sorghum (Sorghum bicolor L. Moench) by using herbicide was assessed in field trials. Glyphosate (Roundup) reduced cell wall content and increased the digestibility of the dry matter. When sprayed towards the end of vegetative growth, quality improvement could be achieved without reduction in yield. Glyphosate may enhance accumulation of sugars, however, the possibility that the herbicide improves forage quality by affecting cell wall structure and digestibility cannot be ruled out.

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