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Articles 961 - 990 of 58714
Full-Text Articles in Physical Sciences and Mathematics
Long Term Weed Management Effects In Alfalfa, Randy Dovel, Mylen Bohle
Long Term Weed Management Effects In Alfalfa, Randy Dovel, Mylen Bohle
IGC Proceedings (1993-2023)
Five herbicide treatment regimes were applied to spring and fall seeded alfalfa from 1991 to 1995 at two locations, Klamath Falls and Powell Butte, Oregon. Treatments were evaluated by measuring alfalfa crown and weed stand counts, yield, weed content and forage quality of all cuttings each year. Weed control treatment did not affect hay yield at Klamath Falls. Severe weed competition in 1991 caused lower yields in untreated plots in 1992 at Powell Butte. Weed growth was most pronounced in the first cutting at both sites. The presence of weeds did not adversely affect forage quality in any cutting except …
Productivity Of Renovated Naturalized Pastures In Atlantic Canada, Y A. Papadopoulos, E Charmley, R C. Martin, A H. Fredeen, K B. Mcrae, D Mason, S.A E. Fillmore
Productivity Of Renovated Naturalized Pastures In Atlantic Canada, Y A. Papadopoulos, E Charmley, R C. Martin, A H. Fredeen, K B. Mcrae, D Mason, S.A E. Fillmore
IGC Proceedings (1993-2023)
The main objective of this study was to evaluate the effectiveness and improved productivity of reduced tillage pasture renovation methods in the establishment of triple species pasture mixtures into an existing naturalized stand. Experimental treatments, 2 (low and high stocking rates) by 2 (frost- and sod-seeding methods) factorial with an additional non-renovated pasture control treatment, were arranged in a randomized complete block design with two replications. Despite the fact that high stocking rates resulted in reduced herbage yield, animal production per hectare was substantially improved in the establishment and the first postestablishment year. Sod-seeding was the most effective establishment method …
Effects Of Method Of Renovation And Rate Of Nitrogen On Naturalized Pastures In Atlantic Canada, H T. Kunelius, M R. Carter
Effects Of Method Of Renovation And Rate Of Nitrogen On Naturalized Pastures In Atlantic Canada, H T. Kunelius, M R. Carter
IGC Proceedings (1993-2023)
Pastures in Atlantic Canada require periodic rejuvenation to maintain productivity. The effects of method of pasture renovation, soil loosening by paraplowing and nitrogen rates on naturalized pastures were determined. Both direct drilling and cultivation and sowing Lolium perenne L. and Trifolium repens L. in naturalized pastures increased the yields slightly and proportion of white clover. Loosening the soil by paraplowing tended to reduce the yields of naturalized swards. Nitrogen concentration and digestibility of dry matter were greatest in sown pastures.
Performance Of Timothy (Phleum Pratense L.) And Meadow Fescue (Festuca Pratensis Huds.) In Mixtures With Lucerne Or Red Clover, M A. Halling
Performance Of Timothy (Phleum Pratense L.) And Meadow Fescue (Festuca Pratensis Huds.) In Mixtures With Lucerne Or Red Clover, M A. Halling
IGC Proceedings (1993-2023)
Results on the botanical composition of timothy and meadow fescue from 14 field trials in south and central Sweden are presented. Each trial had three years of ley. Treatments were two or three harvests a year, and 0, 100 or 200 kg ha-1 nitrogen per season. Three seed mixtures were used: a mixture of timothy and meadow fescue, and either lucerne or red clover mixed with timothy and meadow fescue. The results show that there is a significant correlation between harvesting system and nitrogen application on the percentage of timothy and meadow fescue. At two harvests, the proportion of timothy …
The Effect Of Phytotoxic Substances In Permanent Grassland, E Haugland, R Elven
The Effect Of Phytotoxic Substances In Permanent Grassland, E Haugland, R Elven
IGC Proceedings (1993-2023)
The concentration of phytotoxic substances in permanent grassland was studied and related to botanical composition in a two year study. Species that were negatively correlated to growth retardation varied between the two years. This may have been caused by variation in growth conditions between the two years, but may also indicate that single plant species are not the main source for the phytotoxic substances. Dead decomposing tissue may instead be the main source of phytotoxic substances in permanent grassland.
Dryland Grazing Evaluation Of Grasslands Gala Grazing Brome, B L. Sutherland
Dryland Grazing Evaluation Of Grasslands Gala Grazing Brome, B L. Sutherland
IGC Proceedings (1993-2023)
Grasslands Gala grazing brome (Bromus stamineus), was evaluated for seasonal production and persistence under dryland conditions. Gala was compared with cultivars from three different Bromus species and a high endophyte ryegrass, under three sheep grazing managements which varied in duration and intensity. Seasonal herbage yields indicated that Gala persisted under all managements, but was more productive under short and medium rotation grazing than long rotation lax grazing. Results of this five year evaluation indicate that Gala compares favourably with existing cultivars, with its broad range of tolerances making it a desirable option as a perennial in temperate dryland pastoral …
Influence Of Fall Cutting Management And N Fertilization On Winter Survival Of Lolium Perenne L., P Nadeau, Y Castongauy, R Michaud, J Surprenant
Influence Of Fall Cutting Management And N Fertilization On Winter Survival Of Lolium Perenne L., P Nadeau, Y Castongauy, R Michaud, J Surprenant
IGC Proceedings (1993-2023)
Two perennial ryegrass cultivars known to differ in winter hardiness were subjected to six fall managements comprising two N rates and three fall cutting treatments. Water-soluble carbohydrate changes, winter survival and freezing tolerance were measured as well as subsequent spring production. Fall cutting treatments had strong effects on winter survival as cuts taken late in the fall reduced survival to a greater extent than earlier cuts. Nitrogen fertilization had no preponderant effect on the acquisition of cold tolerance at least under the N levels applied in this study, but was related to more vigorous spring growth. The superior winter survival …
Lamb Performance On Russian Wildrye And Russian Wildrye-Legume Mixtures, David W. Koch, Limei Yun
Lamb Performance On Russian Wildrye And Russian Wildrye-Legume Mixtures, David W. Koch, Limei Yun
IGC Proceedings (1993-2023)
Alfalfa, sainfoin and cicer milkvetch provided relatively little increase in forage production, however, they improved forage palatability and quality, increasing total forage consumption. Over years 3 through 5 of the stand, lamb production per hectare was more than doubled with alfalfa and sainfoin, compared with Russian wildrye (RWR) alone. Cicer milkvetch was relatively slow to establish and did not contribute significantly to mixture quality until Year 5. Alfalfa was more competitive to RWR than sainfoin.
Effect Of Frequency And Intensity Of Defoliation On Oat- Vetch Mixture, M J. Arzadun, M H. Vallejos, M M. Piersanti
Effect Of Frequency And Intensity Of Defoliation On Oat- Vetch Mixture, M J. Arzadun, M H. Vallejos, M M. Piersanti
IGC Proceedings (1993-2023)
An experiment was conducted to evaluate the effect of different cutting regimes on productivity and complementarity between oat and vetch in a mixture. The treatments were allocated in a factorial design on a split-split-plot disposition: they were 3 cutting frequencies (each 35, 70 and 105 days), 3 cutting heights (2, 8 and 14 cm above ground) and 3 crops (oat, vetch and the 1:1 mixture). Forage production (dry matter per hectare) and complementarity between species Relative Yield Total (RYT) were evaluated. The highest forage production (p- 0.05) was obtained with a cutting height of 2 cm and a frequency of …
Grazing Sheep On Revegetated Saline Pastures: Effects Of Season And Grazing On Morphology And Nutritive Value Of Saltbush, Atiq Ur Rehman, J B. Mackintosh, B E. Warren, D R. Lindsay
Grazing Sheep On Revegetated Saline Pastures: Effects Of Season And Grazing On Morphology And Nutritive Value Of Saltbush, Atiq Ur Rehman, J B. Mackintosh, B E. Warren, D R. Lindsay
IGC Proceedings (1993-2023)
This experiment was designed to determine the thickness of saltbush (Atriplex amnicola) stem grazed by sheep, grazing pressure on saltbush in the presence of understorey and the effect of season on the nutritive value of saltbush. Four 0.9 ha plots of Atriplex amnicola were grazed by a group of 10 Merino wethers each. The results indicated that the maximum diameter of stem selected by sheep under extreme conditions was only 1.5 mm. The number of stems chewed per 0.1m2 quadrat were 0.8, 9.6, 20.1 and 18.0 (P<0.05) after 2, 4, 6 and 8 wk. From January to June the nitrogen content (14 to 30 gkg-1) and DMD (0.65 to 0.72) of saltbush leaves remained high. These results suggest that in the presence of understorey the grazing pressure on saltbush was least and increases when the feed from understorey was exhausted. The nutritional value of saltbush did not deteriorate severely during the summer and autumn period.
Productivity Of Grasses In A Pasture In The Cerrado Area Of The "Triangulo Mineiro", I F. Andrade, M A. Oliveira
Productivity Of Grasses In A Pasture In The Cerrado Area Of The "Triangulo Mineiro", I F. Andrade, M A. Oliveira
IGC Proceedings (1993-2023)
A grazing trial using guinea and coloniao (Panicum maximum), setaria (Setaria sphacelata), andropogon (Andropogon gayanus), and signalgrass (Brachiaria decumbens) was conducted during three grazing cycles: 1st cycle - Apr. 5, 1984 to Jul. 23, 1984; 2nd - Dec. 4, 1984 to Oct. 30, 1985 and 3rd - Jan. 16, 1986 to Jan. 15, 1987. It was also used with four stocking rates- T1= 0.8, T2= 1.0, T3= 1.2, and T4= 1.4 animal units/ha (AU/ha). In the 2nd period signalgrass was discarded because of poor condition of the pastures, and in the last grazing cycle …
Establishment Vigor Of Endophyte Free And Endophyte Infected Tall Fescue Cultivars In Southern Ohio, C D. Penrose, H M. Bartholomew, R M. Sulc, E M. Volborn
Establishment Vigor Of Endophyte Free And Endophyte Infected Tall Fescue Cultivars In Southern Ohio, C D. Penrose, H M. Bartholomew, R M. Sulc, E M. Volborn
IGC Proceedings (1993-2023)
Eleven cultivars of tall fescue (Festuca arundinacea, Schreb.) and two cultivars of orchardgrass (Dactylis glomerata L.) are part of a study to evaluate yield, establishment vigor, persistence and palatability under autumn stockpiling conditions. Included in the study are two endophyte infected-cultivars of tall fescue to compare interactions with endophyte free and infected cultivars. The results demonstrate that the newer endophyte-free and low-endophyte tall fescue cultivars evaluated are similar to other orchardgrass and endophyte-infected tall fescue cultivars in establishment vigor and early growth the year following establishment.
Effect Of Irrigation And Nitrogen Fertilization On Ryegrass And Ryegrass/ White Clover Swards, C J. Escuder, C A. Cangiano
Effect Of Irrigation And Nitrogen Fertilization On Ryegrass And Ryegrass/ White Clover Swards, C J. Escuder, C A. Cangiano
IGC Proceedings (1993-2023)
An experiment to determine nitrogen and water effect on dry matter yield of perennial ryegrass (Lolium perenne L) in mixtures with white clover (Trifolium repens L) and pure ryegrass pastures was carried out during two years at Balcarce, the Buenos Aires province, Argentina. Two levels of irrigation, natural rainfall and 20 mm irrigation when needed, and four levels of nitrogen fertilization 0; 150; 300; and 450 kg N.ha-1.yr were applied. During the first year it was necessary to apply 250 mm of supplementary water to the irrigated plots, while 530 mm were needed the second year. Nitrogen responses …
Forage And Protein Production Per Hectare Using Different Species For Interseeding, J A. Josifovich, J O. Scheneiter
Forage And Protein Production Per Hectare Using Different Species For Interseeding, J A. Josifovich, J O. Scheneiter
IGC Proceedings (1993-2023)
The objective was to test the efficiency of different species for interseeding in relation to forage and crude protein production. Avalability of forage and crude protein were evaluated every spring, after 60 days rest. The design was a split-split plot: in an Argiudol soil legumes were the whole plot, grasses subplot and fertilizer subsubplot. Dry matter accumulation did not show any difference in relation to treatments in three of four springs. Crude protein showed differences in three of four springs, being interseeding better than control. Interseeding of old pastures resulted in a good practice to keep the balance legume-grass, as …
Pasture Life Lengthening And Beef Production Increase Through Interseeding, J A. Josifovich, J O. Scheneiter
Pasture Life Lengthening And Beef Production Increase Through Interseeding, J A. Josifovich, J O. Scheneiter
IGC Proceedings (1993-2023)
The objective of the trial was to evaluate the influence of pasture interseeding with grasses and legumes on the forage production and liveweight gains by steers. Four year pastures were interseeded with alfalfa (Medicago sativa L.), brome (Bromus unioloides HBK.), red clover (Trifolium pratense L.) and orchardgrass (Dactylis glomerata L.). There were two treatments with two replications: interseeding and control, grazed by steers. For four periods forage availability did not show differences. Legume percentage was higher in interseeding. The animal daily gains were higher in the interseeded treatment in the first two periods, but decreased with …
Legume-Legume Complementary For Sustainable Pasture Development In The Tropics, M Peters, S A. Tarawali, R Schultze-Kraft, A Musa
Legume-Legume Complementary For Sustainable Pasture Development In The Tropics, M Peters, S A. Tarawali, R Schultze-Kraft, A Musa
IGC Proceedings (1993-2023)
The use of legume-legume mixtures to alleviate limitations of individual species in legume based technologies was investigated in subhumid Nigeria. The results indicate the potential of legume mixtures, through processes of complementation and compensation, to reduce the risk of legume establishment and survival and thus ensure sustainable legume yields and percentages. The implications for on-farm adoption of forage legumes are discussed.
Grass-Legume Mixtures Under Grazing, R D. Amendola Massiotti, C Garcia Alvarez, J Juarez Ramirez
Grass-Legume Mixtures Under Grazing, R D. Amendola Massiotti, C Garcia Alvarez, J Juarez Ramirez
IGC Proceedings (1993-2023)
Nine grass-legume mixtures were evaluated during their first year. A factorial experiment was carried out using a complete block design. Herbage on offer and residual herbage were estimated allowing calculation of net herbage production, herbage accumulation rate and grazing efficiency. The mixture of alfalfa (Medicago sativa L.) and orchard grass (Dactylis glomerata L.) with a net herbage production of 22 407 kg dry matter (DM) per ha outyielded white clover (Trifolium repens L.) mixtures. Substitution of alfalfa by white clover in the mixtures resulted in reduction of herbage accumulation rate by 19 kg DM ha-1 day-1 . …
Competition Between Oats And Annual Ryegrass Under Grazing, R D. Amendola Massiotti, B Morales Mendez
Competition Between Oats And Annual Ryegrass Under Grazing, R D. Amendola Massiotti, B Morales Mendez
IGC Proceedings (1993-2023)
A replacement series experiment was carried out at Chapingo, México aimed to study the seasonal evolution of growth rates of oats (Avena sativa L.) and annual ryegrass (Lolium multiflorum L.) in monocultures and mixtures. Three grazing cycles took place in a period of 181 days. Herbage mass on offer and residual herbage mass were measured, allowing the calculation of herbage accumulation rates. Aggressiveness of oats was higher during the first 105 days growth period, later in the season annual ryegrass was more aggressive than oats. The advantage of the mixture compared to monocultures, depends on a more efficient …
Effects Of Planting Dates On Field Emergence And Forage Yield Of Sudangrass And Sorghum, Fu-Hsing Hsu, Kong-Yuan Hong
Effects Of Planting Dates On Field Emergence And Forage Yield Of Sudangrass And Sorghum, Fu-Hsing Hsu, Kong-Yuan Hong
IGC Proceedings (1993-2023)
Sudangrass (Sorghum sudanense) and sorghum (S. bicolor) are annual forage species with ratoon growth. Objectives of this experiment were to determine the effects of planting dates on field emergence and forage yield of sudangrass and sorghum. Sudangrass and sorghum were planted monthly from mid-March to mid-October in 1994 and 1995, respectively. Emerged plants were recorded daily. Surviving seedlings were determined 2 weeks after emergence. Emergence percentages of sudangrass ranged from 61.7% to 90.6% and those of sorghum ranged from 47.5% to 81.3% in 1994. All the surviving percentages were above 90% for both sudangrass and sorghum in 1994. …
The Induction Of Dormancy In Grass Seed By Paclobutrazol: A Method To Improve Fall Seedings, P R. Salon, A A. Khan
The Induction Of Dormancy In Grass Seed By Paclobutrazol: A Method To Improve Fall Seedings, P R. Salon, A A. Khan
IGC Proceedings (1993-2023)
Dormancy can be induced in grass seeds by soaking in aqueous solution of gibberellin synthesis inhibitors, such as paclobutrazol and tetcyclacis. In a study conducted with perennial ryegrass (Lolium perenne L.) and tall fescue (Festuca arundinaceae Schreb.), dormancy was induced by a 48 hour soak at 35° C in 100 micromolar tetcyclacis (TCY) and 100 micromolar paclobutrazol (PB) as determined by failure to emerge at 20° C. Emergence in the untreated, water soaked, TCY soaked and PB soaked seeds were 92, 92, 10 and 18 % respectively. The containers containing seed and seedlings were then held at 5°C …
Growth Of Heifers And Changes In Vegetation In A Natural Grassland Oversown With Caribbean Stylo, Vinod Shankar, J N. Gupta, V S. Upadhyay
Growth Of Heifers And Changes In Vegetation In A Natural Grassland Oversown With Caribbean Stylo, Vinod Shankar, J N. Gupta, V S. Upadhyay
IGC Proceedings (1993-2023)
The paper reports a three year study on the growth of heifers and vegetational changes in a natural grassland oversown with caribbean stylo and grazed in a deferred- rotational grazing system. There were two feeding treatments. One set of grazing heifers was given common salt only. The other set of heifers were given supplemental feeding of leucaena green @4 per cent or Leucaena hay @ 1 per cent body weight. The supplemental feeding of leucaena was beneficial in terms of body weight gain particularly during the dry summer months. Population of the caribbean stylo oversown in natural Sehima- Heteropogon …
Grazing Strategies To Increase Persistence Of Phalaris Aquatica L. In Summer Rainfall Areas Of Temperate Australia, G M. Lodge
IGC Proceedings (1993-2023)
A grazing strategy of resting Phalaris aquatica L. pastures in springearly summer (to increase the presence of flowering tillers over summer) and autumn (to allow bud and tiller development) markedly increased its persistence, compared with continuously grazed plots in a summer rainfall environment.
Impact Of A Pastoral Fallow On The Morphology And Growth Of White Clover (Trifolium Repens L.) In New Zealand Hill Pasture, Z N. Nie, I Valentine, D J. Barker, A D. Mackay, J Hodgson
Impact Of A Pastoral Fallow On The Morphology And Growth Of White Clover (Trifolium Repens L.) In New Zealand Hill Pasture, Z N. Nie, I Valentine, D J. Barker, A D. Mackay, J Hodgson
IGC Proceedings (1993-2023)
Lifting the content and improving the distribution of perennial legumes such as white clover (Trifolium repens L.) of hill pastures in New Zealand is a major objective of a pasture improvement programme. This paper reports on the ecology of white clover over a 2 year post-fallow period. The fallow was a 7 month period without defoliation over spring-summer-autumn. The stolon length and weight of white clover increased from year 1 (94/95) to year 2 (95/ 96) post-fallowing (P<0.1 and 0.05, respectively), while the average internode length declined (P<0.05). However, the white clover growth rate was not significantly increased in the two measurement years. Fallowing significantly increased grass growth rate (P<0.05) in the two years post-fallowing. The grasses seemed to have an immediate response post-fallowing, while the response of white clover was slower and cumulative.
The Potential Of Winter Rye Cultivars In The Gauteng Province Of South Africa, C C. Botha, N.F. G. Rethman
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.
Analysis Of Pasture Management Practices Within A Pasture Composition Matrix Model, D R. Kemp, D L. Michalk, P M. Dowling, T A. Klein
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 …
Productivity Of Silphium Perfoliatum L. In Low Input Agricultural Systems, G Pichard, R Cussen, F Moore
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 …
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
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.
Pasture Species For Grazing-Based Dairy Production Under Irrigated In The Intermountain West, J W. Macadam, R E. Whitesides, M B. Winger, S Buffler
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 …
Interpreting Guineagrass Behaviour Under Different Clipping, Nitrogen And Irradiance Regimesa, A Paez, M E. Gonzalez, L Villavicencio, A Salazar, D Tissue
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 …
Separate Harvest Of Leaves From The Stems Of Lucerne Stands, L Schmidt
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 …