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Articles 11011 - 11040 of 11977
Full-Text Articles in Physical Sciences and Mathematics
Nitrification Inhibitors, Wilbur Frye
Nitrification Inhibitors, Wilbur Frye
Soil Science News and Views
Nitrogen often limits the production of nonlegume crops because of inefficiency of N fertilizers. In some cases, more than half the fertilizer N may be lost from the soil. Therefore, it is important to use it as efficiently as possible. One way in which N fertilizer efficiency may be improved is by slowing the nitrification process in the soil.
Cover Crops And Crop Residues, Robert L. Blevins
Cover Crops And Crop Residues, Robert L. Blevins
Soil Science News and Views
In Kentucky, erosion hazard is by far the major limitation for use of cropland. It has been estimated that about 11.4 million acres are subject to erosion hazards. This means that approximately 75% of the soils potentially suited for cropland is sloping enough that risk of erosion is the greatest limitation in its use for crop production. Probably the greatest risk of erosion results from leaving row-cropped fields unprotected over winter. The use of cover crops and proper management of crop residues to stablize these soils during the winter months are relatively inexpensive agronomic practices that are very effective in …
Regional Tectonics And Seismicity Of Eastern Nebraska, Annual Report, July 1979–June 1980, R. R. Burchett
Regional Tectonics And Seismicity Of Eastern Nebraska, Annual Report, July 1979–June 1980, R. R. Burchett
Conservation and Survey Division
This annual report presents and interprets the information obtained by the Conservation and Survey Division (Nebraska Geological Survey) during contract year July 1, 1979, to June 30, 1980, under contract NRC-04-76-3l5 with the U.S. Nuclear Regulatory Commission. The information pertains to the geology, structure, tectonics, and seismicity of eastern Nebraska with emphasis on the vicinity south of Omaha, Nebraska. Some of the information presented here results from a combination of studies begun in earlier years but the greater part results from studies begun during the contract year.
The scope of the studies is summarized as follows:
1. Rock outcrops in …
Soil Surveys In Kentucky, Harry Hudson Bailey
Soil Surveys In Kentucky, Harry Hudson Bailey
Soil Science News and Views
Fifty-four Kentucky counties have modern soil surveys (published 1959, or later) using the mapping and soil classification procedures of the National Cooperative Soil Survey. The cooperators in the program include the USDA-SCS, USDA-FS, Kentucky Department for Natural Resources and Environmental Protection and the Kentucky Agricultural Experiment Station.
Land Degradation In The Fitzroy Valley Of Western Australia, Department Of Agriculture, Western Australia. Rangeland Management Branch
Land Degradation In The Fitzroy Valley Of Western Australia, Department Of Agriculture, Western Australia. Rangeland Management Branch
Resource management technical reports
The report reassesses the condition of formerly valuable grazing lands of the Fitzroy River valley frontage lands. It is hoped that the submission will promote discussion on the problems of degenerated pastoral land and increase the resolve of all concerned to take the necessary action for their restoration. The frontage lands flank the major rivers of the area, the Fitzroy, the Margaret and the Meda and their tributaries. The frontage is capable of supporting the best pastures in the Kimberley, but unwise and uncontrolled stocking has profoundly degraded and eroded the most productive parts. There are about 5,800 square kilometres …
The Status Of Sulfur Fertilization Of Crops In Kentucky, Lloyd W. Murdock
The Status Of Sulfur Fertilization Of Crops In Kentucky, Lloyd W. Murdock
Soil Science News and Views
Sulfur has long been recognized as being essential for the growth of plants and animals due to it being necessary for production of several amino acids. Although regarded as a "secondary" element, it is required by plants in fairly high amounts, very similar to that of phosphorus. Sulfur deficiency symptoms in plants are somewhat similar to those of nitrogen since an overall uniform pale-green leaf color develops. Sulfur deficiencies are often found in crops growing on sandy soils with low organic matter content.
Groundwater Levels In Nebraska, 1980, Martin S. Johnson, Darryll T. Pederson
Groundwater Levels In Nebraska, 1980, Martin S. Johnson, Darryll T. Pederson
Conservation and Survey Division
No abstract provided.
Use Of Plant Analysis, William O. Thom
Use Of Plant Analysis, William O. Thom
Soil Science News and Views
Plant analysis is the laboratory determination of several nutrient elements on a single sample of plant material. In recent years this technique has been more frequently used to diagnose soil fertility problems 0r to monitor soil fertility recommendations on growing crops. Current instrumentation makes it possible to rapidly determine several elements on an extract from a plant sample.
Influence Of Soil Type On Nitrogen Fertilization Of Corn, Grant W. Thomas
Influence Of Soil Type On Nitrogen Fertilization Of Corn, Grant W. Thomas
Soil Science News and Views
In Kentucky, response of corn to nitrogen fertilizer is influenced strongly by soil characteristics. These soil properties are of both a permanent and temporary nature.
Nebraska Mineral Operations Review, 1980, D. A. Eversoll, R. R. Burchett
Nebraska Mineral Operations Review, 1980, D. A. Eversoll, R. R. Burchett
Conservation and Survey Division
No abstract provided.
Fertilizing Soybeans, Monroe Rasnake
Fertilizing Soybeans, Monroe Rasnake
Soil Science News and Views
Soybeans need a fertile soil with a pH of about 6.4 for maximum production. This condition is best attained through a regular soil testing and fertilization program. A fertility program based on fertilizer and lime. use as determined by soil testing is more economical and more effective than applying large amounts of fertilizer at planting. Soil testing is the key.
Modeling Soil Water Contents And Their Effects On Stream Flow In Kentucky, Grant W. Thomas, Ronald E. Phillips, David E. Radcliffe, Scott Shepard
Modeling Soil Water Contents And Their Effects On Stream Flow In Kentucky, Grant W. Thomas, Ronald E. Phillips, David E. Radcliffe, Scott Shepard
KWRRI Research Reports
Soil water contents of eight important soil series in Kentucky were measured periodically during the summer growing season for four years, 1977 through 1980. The soils divided into three groups according to their behavior. The first group (Maury and Crider) is well-drained and never showed excess water above field capacity at any time during the four seasons. The second group (Zanesville, Lowell, Calloway, Grenada and Shelbyville) showed perched water tables at times, especially during the early part of the growing season. The third group was represented by the Huntington soil which has a permanent water table.
The in-situ field capacity …
Fluid Fertilizers, Kenneth L. Wells
Fluid Fertilizers, Kenneth L. Wells
Soil Science News and Views
Fluid fertilizers are available in a wide range of products to Kentucky farmers. Although the term "liquid fertilizer" is commonly used to describe all fluid fertilizers, in reality the two terms do not imply the exact same meaning. Technically, all fertilizers of fluid consistency which can be transferred by pump are called "fluid f ertilizers11. This is the proper term to use in the broadest sense to describe such materials. There are two general types of fluid fertilizers. One group is called "suspensions" or "slurries", and the other group is referred to as "clear liquids".
Comparing Three Water Quality Sampling Techniques For Measuring Non-Point Source Pollution In Forest Streams, R. Scott Beasley
Comparing Three Water Quality Sampling Techniques For Measuring Non-Point Source Pollution In Forest Streams, R. Scott Beasley
Technical Reports
Coshocton wheel samplers, ISCO pumping samplers, and single stage samplers were compared on each of three small (5-6 ha), forested watersheds in the Ouachita Mountains of central Arkansas. The objective of the comparisons was to evaluate the performance of each sampling method in providing reliable samples for measuring concentrations of total suspended solids (TSS). H-flumes and water level recorders provided stream discharge data; a network of recording and non-recording raingages provided preciptation measurements. Rainfall and storm discharges during the study period were unusually low. No samples were collected by the single stage samplers. They appear unsuited for use on small …
Water Relationships Of Kentucky Soils, Ronald E. Phillips, Grant W. Thomas
Water Relationships Of Kentucky Soils, Ronald E. Phillips, Grant W. Thomas
Soil Science News and Views
Plant water stress is the most limiting single factor in crop production in Kentucky. It almost always occurs sometime during July and/or August even though it's variability makes it hard to predict. Even though the 1979 growing season was an exception to this generalization the 1980 growing season was a vivid reminder of this fact especially in Western Kentucky.
Loose Smut Of Barley. Sub-Clover Root Rot. Rapeseed Diseases., M. J. Barbetti
Loose Smut Of Barley. Sub-Clover Root Rot. Rapeseed Diseases., M. J. Barbetti
Experimental Summaries - Plant Research
Loose smut of barley. Fungicidal control of loose smut in barley – 81MT31, 81NA29. Sub-clover root rot. Fungicidal control of pythium sp – 81AL37, 81BU3. Rapeseed diseases. 1. Rapeseed varieties/Lancelin blackleg strain – 81MO24. 2. Rapeseed varieties/Sclerotinia disease – 81MT32. 3. White leaf spot and grey stem of rapeseed – 81MT33.
Sulphur Nutrition Of Pastures And Crops, Phosphorus And Potassium Nutrition Of High Rainfall Pastures On Deep Sands, Soil Acidity - High Rainfall Pastures, J S. Yeates, M F. Clarke
Sulphur Nutrition Of Pastures And Crops, Phosphorus And Potassium Nutrition Of High Rainfall Pastures On Deep Sands, Soil Acidity - High Rainfall Pastures, J S. Yeates, M F. Clarke
Experimental Summaries - Plant Research
A. SULPHUR - HIGH RAINFALL 1. Rates and time of application of superphosphate to pastures. 79AK2, 79AL23, 79AL25, 79AL41, 81BY1, 81KE1. 2. Sulphur soil test calibration on pastures. 79AL18, 80BY2, 80KE2. 3. Sulphur soil test calibration on pastures: Co-operative PKS soil test project on pastures on duplex soils of the east Albany area (PRD/ARO). Sulphur results. 80 AL44, 46, 47, 48, 72, 73 81AL51, 53, 55 4. Sulphur on adsorbing soils receiving no current S input. 80BY1., 80AL16. 5. Sources, rates, time of application of sulphur on pastures. 80AL1, 80AL4, 81AL3, 81AL4, 80KE1, 80MA1 B. SULPHUR - LOW RAINFALL 1. …
Aerial Spraying Trial., G A. Pearce
Aerial Spraying Trial., G A. Pearce
Experimental Summaries - Plant Research
Conclusions 1. The volume of application with water affected the results obtained. The visual results of Treatment 1 suggested it was not an acceptable commercial result and the plant counts support this conclusion. Treatments 2 and 3 looked very similar and were very similar and were very acceptable results. 2. The height of spraying affected the results in that where the plane had to start climbing to pass over trees, the effectiveness dropped off. 3. Spray drift could be a problem because of the risk of causing damage to trees and native vegetation. Severe damage was seen on trees at …
Field Preparation For Pasture Renovation, Harold B. Rice
Field Preparation For Pasture Renovation, Harold B. Rice
Soil Science News and Views
Grassland renovation is the improvement of pasture and hay fields by partial destruction of the sod, plus liming, fertilizing, and seeding as may be required to establish or re-establish desirable forage plants without an intervening crop. In Kentucky, this improvement has been primarily through the seeding of legumes such as clovers and alfalfa into grass sods.
Since liming and fertilizing are essential steps in pasture renovation the FIRST step is to have your soil tested to determine how much lime and plant nutrients to apply. Seedbed preparation will range from none to complete disturbance of the existing sod depending on …
Pasture Trials At Esperance, M Da Bolland
Pasture Trials At Esperance, M Da Bolland
Experimental Summaries - Plant Research
Introduction. Most of the 1981 data viz seed yield results, and hardseed data, has not yet been completely processed, and thus only some of the data can be presented in this summary. Section i: Medic species trials – 80SG39, 80SG23, 80SG24, 80ES65(a), 80ES21 (a). Section ii: Lucerne variety trials – 81ES28, 81ES25, 81ES29, 81ES30, 81ES31.
Doublegee Seed Dormancy. Lupins -Weed Control,Herbicides, New Products, D J. Gilbey
Doublegee Seed Dormancy. Lupins -Weed Control,Herbicides, New Products, D J. Gilbey
Experimental Summaries - Plant Research
Doublegee seed longevity x depth - 75WH66, 76C9, 76KA8. Grass control in dry sown lupins – 81A46, 81GE21, 81TS33. Broadleaf weed control in dry sown lupins – 81TS34, 81A47. Early post-emergence weed control – 81GE20. Early post-emergence weed control - lupins - 81TS32, 81A45. Post-emergence grass control in lupins. Post-emergence grass control in lupins None of the mixtures of Barban with Hoegrass and Matavin controlled the main target, Bromegrass. No significant differences due to treatments were detected in grain yields except at Avondale where annual ryegrass was the main grass weed which was controlled readily by the Hoegrass treatments as …
1981 Trace Element Nutrition, J. W. Gartrell, R F. Brennan
1981 Trace Element Nutrition, J. W. Gartrell, R F. Brennan
Experimental Summaries - Plant Research
1. Long term copper trial - Newdegate Research Station - 66N14. 2. Zinc residual with OAP for wheat - 80NO31. 3. Zinc residual with OAP for wheat - 79ME22. 4. Zinc residual with OAP for wheat - 79ME23. 5. Zinc, sulphur and copper residual with OAP for wheat - 79WH66. 6. Wheat response to zinc rates - 81MO8. 7. Manganese on wheat and oats - 81KA29. 8. Molybdenum and ammonium sulphate (S/A) on wheat - 81NO40. 9. Molybdenum and ammonium sulphate on wheat - 81NO41. 10. Molybdenum and ammonium sulphate on wheat - 81NO39. 11. Mo, lime, Mg on sub. …
Nitrogenous Fertiliser Requirements In Different Cropping Rotations 1981 Results, M G. Mason, I C. Rowland
Nitrogenous Fertiliser Requirements In Different Cropping Rotations 1981 Results, M G. Mason, I C. Rowland
Experimental Summaries - Plant Research
Nitrogen Requirement of Wheat After Clover, Lupins and Cereal – 78C1, 80BA3, 78N1. Nitrogen Requirement of Barley After Clover, Lupins and Non Legume – 78E3. Nitrogen Fertiliser Requirement in Alternate Crop-Pasture Rotation – 78BA1, 78WH2. Nitrogen Fertiliser Requirement in a Lupin - Wheat Rotation – 81LG29.
Part 1. A. Take-All Of Cereals B. Rhizoctonia C. Pythium Root Rot Of Wheat, Part 2, A. Minimum Tillage Trials., G S. Macnish
Part 1. A. Take-All Of Cereals B. Rhizoctonia C. Pythium Root Rot Of Wheat, Part 2, A. Minimum Tillage Trials., G S. Macnish
Experimental Summaries - Plant Research
Take-all following cleaning crops. Take-all build-up on new land rotation. Take-all build-up and rates of phosphorus on wheat. Long-term rotation and take-all. Take-all incidence in cereal/lupin rotation. Take-all incidence in a wheat/clover or/pasture rotation. Continuous wheat and take-all. Rhizoctonia patch of cereals. Rhizoctonia mapping experiment. Rhizoctonia patch - control. Pythium root rot of wheat. Part 2. Sprayseed followed by direct drilling with triple disc drill. Plough, Sprayseed followed by direct drilling with triple-disc drill. Sprayseed followed by direct drilling with combine. Cult + seed with combine - Sprayseed followed by cultivation followed by drilling with combine. For this report the …
Grass Control In Pastures., C W. Thorn
Grass Control In Pastures., C W. Thorn
Experimental Summaries - Plant Research
Crop Yields after Pasture Manipulation in 1980. Effect of Grass Control on Pasture Production. Effect of Grass Control on Animal Production. Pasture Density Effects and Composition on Soil Nitrogen. The Effect of Kerb (R) on Rapeseed, Linseed and Barley Grass. 80M041, 80M040, 80AB2, 81A23, 81 A188, 81Ba2, 81 N3, 81 N2, 81 A11 81N21, 81Ka1, 81Ka2, 81 Na3, 81NO5, 81MO1
Investigations Of Ryegrass Toxicity., Brian A. Stynes
Investigations Of Ryegrass Toxicity., Brian A. Stynes
Experimental Summaries - Plant Research
81KA47, 81NA47, 81M047, 81KA48, 81NA45, 81M045, 81KA50, 81NA46, 81M046, To monitor the amount of toxin present in galls from the time of first head emergence until maturation of the ryegrass pastures. To relate the onset and development of toxicity to plant growth stages and climatic conditions in the different regions affected by annual ryegrass toxicity. To relate the level of toxicity to pasture density and to the number of galls present in the pasture. As part of the series of experiments done to monitor the amount of toxin present in pasture at a number of sites throughout the seasons, an …
Long Term Rotation Trials., I Rowland.
Long Term Rotation Trials., I Rowland.
Experimental Summaries - Plant Research
Long term rotation trials. 66M29/2083EX, 67Cl3/2332EX , 67N4/2333EX, 68E5/2474EX , 68SG5/2475EX , 73SG16. Lupins: Wheat Rotation. 79GE36/3288EX, 79GE37/3288E, 80TS3/3288EX, 73SG16/3229EX Continuous Cropping with Nitrogenous Fertiliser. 80NA6
The Effect Of Soil Acidity On Crop And Pasture Production., W Porter, R Klemm
The Effect Of Soil Acidity On Crop And Pasture Production., W Porter, R Klemm
Experimental Summaries - Plant Research
SUMMARY The effects of lime and molybdenum applications on wheat and subterranean Clover were studied further. Wheat. In relation to lime use, my aim is to develop soil tests to be used to predict when a soil requires lime to produce maximum yield, and to predict the optimum rate of lime. Using the results from field trials commenced in 1980 and 1981 the soil parameters which may be used to predict lime responses in wheat have been narrowed down. From the relationships between soil data and lime responses it appears that soil ph (measured in 1:5 H20 or 1:5 N …
Experimental Summaries., M W. Perry, R N. Weir
Experimental Summaries., M W. Perry, R N. Weir
Experimental Summaries - Plant Research
Wheat Yield Potential Trials, 81BA4, 81WH7, 81KAS.Wheat-Regenerating Sandplain Lupin Rotation Trials, 79GE38, 79GE42.Nitrogen x Cycocel x Foliar Nutrients x Fungicide-on Wheat,81KA6. Historical Wheat Trials, 81A3, 81C4, 81SG22, 81WH6. Time of Planting on Cereal Yields, 81NA8, 81KA55.
The Effect Of Chemical Grass Control In Pastures On Subsequent Crop Production And Take All Levels, C W. Thorn
The Effect Of Chemical Grass Control In Pastures On Subsequent Crop Production And Take All Levels, C W. Thorn
Experimental Summaries - Plant Research
To evaluate the effect of chemical grass control, 82LG25.
Introduction. Methods. General notes on the trials. Results and discussion. Conclusions.