Physical Sciences and Mathematics Commons^™

Fertilizer Recommendations, William O. Thom

Soil Science News and Views

Fertilizer recommendations are interpreted from a soil test value. The interpretations are based on field research that compares crop yield to soil test levels and the amount of fertilizer applied. These field studies provide data to compare relative yield of a crop for a measured soil test value and fertilizer recommendations are then calibrated to these soil test values.

Soil Drainage---Effects On Crop Production, Kenneth L. Wells

Soil Science News and Views

One of the major physical properties of soil which is important to crop production is drainage through the rooting zone. This characteristic greatly influences aeration in the rooting zone, and the degree of aeration greatly influences several important biochemical reactions of economic importance to crop production.

Conservation Tillage Practices, Monroe Rasnake

Soil Science News and Views

The loss of topsoil from farmlands has become a serious problem in some parts of Kentucky. During the past 20 years, grain crop acreage has tripled. The production of soybeans, which leaves the soil in a condition more susceptible to erosion, has grown from almost none to 1.7 million acres. Much of this increased acreage has come at the expense of soil conserving crops such as hay and pasture on sloping class II and III land with an erosion hazard. Use of large equipment, larger fields, chemical weed control, etc., has added to the scope of the problem with which …

Climate Of Nebraska, Richard E. Myers

Conservation and Survey Division

No abstract provided.

Use Of Annual Legumes As Winter Cover For No-Till Corn, Robert L. Blevins

Soil Science News and Views

Legumes in crop rotations hsve traditionally provided nitrogen for nonlegume crops since the early history of agriculture. When in association with the proper strains of Rhyzobium bacteria, legumes are capable of fixing atmospheric nitrogen, which when residues from the legumes decompose, enrich the soil content of nitrogen. Legume cover crops recycle other nutrients, thus reducing leaching losses that often occur in soils during the winter and spring seasons. In addition to these advantages, legume cover crops used with no-tillage corn provide a surface mulch which reduces soil erosion, slows evaporation of soil moisture, increases infiltration of rainfall, and increases soil …

Effects Of Soil Erosion On Productivity, Wilbur Frye

Soil Science News and Views

About 75 percent of Kentucky's agricultural land is sloping enough that potential erosion losses must be considered in its management. In addition to the effect of soil erosion on water pollution is the question of its effect on the productivity of the soil. This is a complex question due to the interactions of the many factors that affect crop growth. Furthermore, the same degree of erosion has a greater adverse effect on some soils than on others. The kind of erosion that has taken place or is taking place is a major factor in making land use decisions for crop …

Groundwater Levels In Nebraska, 1979, Martin S. Johnson, Darryll T. Pederson

Conservation and Survey Division

No abstract provided.

Delayed Nitrogen Applications On Corn, Grant W. Thomas

Soil Science News and Views

A method of fertilizer application that was standard practice 30 to 50 years ago has become important once again, and for the same reason. When nitrogen fertilizer was expensive and corn was cheap, it was considered prudent to save back some of the nitrogen fertilizer and apply it when the corn was "knee-high." This was thought to be safer because some of the nitrogen added at planting might be lost before the corn was big enough to take advantage of it. The increasing cost of nitrogen fertilizer has made efficient use of this product important again.

Effects Of Changes In Surface Water Regime And/Or Land Use On The Vertical Distribution Of Water Available For Wetland Vegetation: Dynamic Model Of The Zone Of Aeration (Part 1 Of Completion Report For Project A-023-Ark), Robert N. Maccallum, R. A. Sims

Technical Reports

A mathematical model by Green, simulating one-dimensional vertical ground-water movement in unsaturated soils of the prairie region of Kansas, has been adapted for use in a wetlands environment typified by the wetlands forest of Eastern Arkansas. The model consists of two second-order, non-linear, partial differential equations and an algorithm for their numerical solution. The original model was extended to include functions for seasonal changes in transpiration and for drainage of excess precipitation. Before the addition of the two functions, the model reliability was limited to one growth season.

Influence Of Las Vegas Wash Density Current On Nutrient Availability And Phytoplankton Growth In Lake Mead, John R. Baker, Larry J. Paulson

Publications (WR)

Density currents are commonly formed in reservoirs because of temperature or salinity induced density differences between inflowing and receiving waters. Anderson and Pritchard (1951) were among the first to demonstrate this in their investigations of density currents in Lake Mead. They found that the Colorado River formed an underflow in Lake Mead during the winter, an overflow in the spring and an interflow in the summer and fall. Wunderlich and Elder (1973) have since described the hydromechanics of these types of flow patterns, and density currents have been reported for several other large reservoirs (Carmack et al. 1979, Johnson and …

Soybean Inoculation, J. L. Sims

Soil Science News and Views

Well-nodulated soybean plants are needed for most efficient soybean production. Recent research by University of Kentucky Agronomy Department personnel indicated that on Maury soil without N fertilizer, nodulating plant types of Clark 63 variety yielded 8 bushels per acre more than the non-nodulating Clark 63. With application of 125 lbs N per acre to the non-nodulating type only, both types yielded the same, showing the value of good nodulation.

Sorrel - Effects Of Soil Nutrients, Dock – Control, Lupins - Residual Dicamba. Peas - Herbicide Screening, Rape - Herbicide Tolerance, Ryegrass - Effect On Wheat Yield, ‘Round Up’ - Drift Test, Artichokes - Herbicide Screening., John Moore

Experimental Summaries - Plant Research

Sorrel - effects of soil nutrients - 80KA39, 80KA40, Dock – control - 80AL74, 80AL76. Herbicides for Spray Graze of Dock in Clover Pasture. J. Tuffley, Albany. Herbicide mixtures for Dock in Clover - R. Pugh, Narrikup. Lupins - residual dicamba - 80MT44. Spray graze with cattle - 80AL80 Peas - herbicide screening - 80AL77. Rape - herbicide tolerance - 80MT45. Ryegrass - effect on wheat yield - 79A32. ‘Round up’ - drift test - 80AL79. Artichokes - herbicide screening - C. Barone, Elliot Road, Wanneroo.

Determination Of Sediment Filtration Efficiency Of Grass Media, David T. Kao

KWRRI Research Reports

Vegetative filters serve the purpose of retarding flow. As a result the sediment carrying power of flowing water in a vegetated channel is greatly reduced and silting takes place along the section where the vegetation is planted.

The mechanism of the filtering action of real or artificial vegetation can be described by a simplified principle, in that a gross reduction of turbulent fluctuation of the fluid is involved. This in turn allows the sediment particles to settle under the force of gravity more readily. In the case of nonsubrnerged flow, solid particles may settle out even faster due to the …

Dpx 4189 And Other Herbicides For Weed Control In Wheat, G. A. Pearce

Experimental Summaries - Plant Research

DPX 4189 and other herbicides for weed control in wheat: Object: To compare DPX 4189 with other herbicide treatments for the control of Broadleaved weeds and ryegrass in a wheat crop. Location Toodyay. Location: Moora District office trial . T Reynolds, Miling – 80MO43 – Gamenya wheat sown 29/5/80. Hoegrass plus Brominil trials 1980. To test the efficiency of Brominil M mixed with Hoegrass for weed. Sites: Toodyay and Dowerin.E. & M. Browne and Sons, East Wannamal – 80MO47B - Darkan wheat sown 16/6/80. O. & E. Coyle, Pithara - 80MO50 – Gamenya Wheat sown 29/5/80. Tank mixes with hoegrass. …

Weed Control In Pastures And Cereals, J R. Peirce

Experimental Summaries - Plant Research

80N037 - Post sowing - pre emergence applications of chemicals for soursob control in cereals. Property J. Miller - Beverley. Gamenya wheat - sown 25/6/80. 80N039 - Chemical control of soursob in cereals using herbicide combinations. Property J. Miller, Beverley. Gamenya wheat, sown 25/6/80. 80N038 - Post-emergent chemical control of Soursob in cereal crops. Property J. Miller - Beverley. Crop Gamenya wheat, sown 25/6/80. 80N038 - Post emergent chemical control of soursob in cereal crops. Property N. Hansen - Northam. Crop Warimba wheat sown on 4/6/80. 80N039 - Property Chemical control of soursob in cereals using herbicide combinations. N. Hansen …

Sulphur Nutrition Of Pastures And Crops Phosphorus And Potassium Nutrition Of Pastures On Deep Sands In The High Rainfall Areas, J S. Yeates, M F. Clarke

Experimental Summaries - Plant Research

CONTENTS A. SULPHUR 1. Sources, rates, time of application of sulphur to legume pastures (high rainfall) - 80AL1, 80AL4, 80MA1, 80KE1. 2. Sulphur soil test on pastures (high rainfall) - 80AL12, 80AL13, 80AL14, 80BY2, 80KE2. 3. Sulphur rundown on sulphur absorbing soils of the high rainfall areas - 80BY1. 4. Sulphur requirements of pasture in low rainfall areas - 80JE17, 80M020. 5. Residual value of 1979 applied sulphur. Rates of fine gypsum applied 1980 - 79AL2, 79AL18, 79AL22, 79AL23, 79AL25, 79AL41, 78BA8 B, 79BY3, 79BY4, 79HA2, 79KE3, 79KE7, 79M020. 6. Sulphur requirements of wheat - 80JE16, 80M09. B. PHOSPHORUS 7. …

The Effect Of Soil Acidity On Crop And Pasture Production, W Porter, W Cox, R Klemm

Experimental Summaries - Plant Research

Contents: 1. Summary. 2. Details of research. 2.1 Problem definition glasshouse trial. 2 (a) Vegetative yield affected by topsoil acidity. 2 (b) Root growth in acid subsoil . 2.2 Field Trials. (a) Wheat - Grain yield - Vegetative Growth. (b) Clover. (c) Acidification of soils from the use of nitrogen fertilisers 3. Appendices - trial data. Summary: 1. Problem defining glasshouse trials on soil from 12 sites were conducted in summer/autumn. Results showed that the components of soil acidity affecting wheat growth... 2. The lime and molybdenum requirements of wheat and clover were examined at the sites from which soil …

Ground Driven Powered Tillage, Larry G. Wells, E. M. Smith, D. E. Hammett, H. J. Thompson Jr.

Biosystems and Agricultural Engineering Faculty Publications

A ground driven powered tillage device is described which utilizes a passive rolling coulter propelled through the soil by a prime mover. The reaction torque imparted by the soil to the coulter is delivered via a torque transfer unit to a powered tillage blade. The tillage blade rotates counter to the direction of the passive rolling coulter and prepares a tilled furrow of some predetermined depth for seed placement and coverage.

Analysis is presented in which the torque developed by a passive rolling coulter engaging the soil is predicted. A relationship is presented for determining the velocity ratio between the …

(1) Powdery Mildew Control Of Grapes With Fungicides. (2) Black Spot And Downy Mildew Of Processing Peas: 80al32. (3) Facial Eczema Investigation., A Bokor

Experimental Summaries - Plant Research

Powdery mildew control of grapes with fungicides. Location: Mount Barker Research Station. Black spot and downy mildew of processing peas - 80AL32. Facial eczema investigation. Facial eczema is a recognised myco-toxic disease of grazing stock in New Zealand. It is caused by a fungus Pithomyces chartarum growing on dead litter part of the pasture. The disease has become recognised as a risk to sheep in the Albany Region following reported losses in 1978. A pasture paddock at Cape Riche was sampled weekly by the Animal Division to determine fluctuations in spore numbers of P. chartarum. Comments: The fungus could readily …

Phosphorus Sources Trials, M J. Baker, J. W. Bowden

Experimental Summaries - Plant Research

Pasture trials. 75N07B - New land pasture at Chittering – gravel. 76MT10 - New land pasture at Mt. Barker – gravel. 77MT1 - New land pasture at Mt. Barker – gravel. Methods and particle size.

Cropping trials 77MT2 - Old land at Mt. Barker - gravel – oats. 76WH10 - Young land at Wongan Hills - WLS – wheat. 76WH14 - Very old land at Wongan Hills - WLS – wheat. 77WH2 - Very old land at Wongan Hills - WLS – wheat. 77M016 - New land at New Norcia - gravel – wheat. 80BA6 - New land at Badgingarra …

Septoria Diseases, A. G. P. Brown

Experimental Summaries - Plant Research

Effect of stubble and seed infection on S. nodorum at Badgingarra. Fungicide timing on Septoria control.

Double cropping wheat was simulated by spreading stubble fragments collected from an adjoining paddock at 30 g/m2. Infected seed was from a 1979 sowing at Badgingarra, clean seed was pedigree Gamenya ex Merredin. Treatments were thus:- 1. Clean seed, no stubble. 2. Clean seed plus stubble. 3. Infected seed, no stubble. 4. Infected seed plus stubble. Plots were 10 x 25 m separated by equal sized barley buffers.

Trace Element Nutrition, J. W. Gartrell, R. F. Brennan

Experimental Summaries - Plant Research

Field trials. 1. Long term copper residual page 1. 2. Effect of granule size and cultivations on copper availability – 79N23 page 2. 3. Copper, zinc residual for sub-clover – 78MO26 page 5. 4. Copper, zinc residual for sub-clover on peaty sand – 75AL24 page 6. 5. Effect of copper fertilizer on wheat yield – 80NO27 page 7. 6. Ammonium sulphate/molybdenum on wheat – 80NO28 page 8. 7. Mo, lime, mg on sub-clover – 80NO29 page 9. 8. Zinc residual with high analysis N.P. Fertilizer for wheat – 80NO31 page 10. 9. Zinc, sulphur, copper residual with high analysis N.P. …

Grass Control And Minimum Tillage Herbicides, J. E. Holmes

Experimental Summaries - Plant Research

Bromegrass. Wheat loss caused by bromegrass - 80WH47. Herbicides for bromegrass control - 80WH48. Bromegrass control - spraytop - 79NO41. Control of bromegrass – spraytop - 79BA59. Brome and barley grass control - 80NA62. Wild oats. Wild oat control - comparison of commercial treatments – 80NO44. Wild oat control - minimum tillage system - high challenge SITE - 80NO45. Ryegrass. Ryegrass control. Hoegrass effect of rates x volumes x times of application - 80SG41. Barley grass. Barley grass control in wheat - 80SG40. Pasture manipulation. Pasture manipulation - grass reduction - 79A31. Pasture manipulation - rates of herbicide - 80AB3. …

Nitrogenous Fertilisers For Cereals, Rape And Linseed. Results From 1980 Trials., M. G. Mason

Experimental Summaries - Plant Research

Effect of stubble treatment on nitrogen fertiliser requirement – 78C3, 78M2, 78WH3. Rate of N on wheat - conventional vs. Direct drilling – 80A1, 80Cl, 80N1. Rate and time of application of nitrogen on wheat - CONVENTIONAL VS. DIRECT DRILLING – 80E1. Rate and time of application of nitrogen on rape - conventional vs. Direct drill – 80MT1. Rates of nitrogen on wheat on heavy land – 80GE1, 80GE2, 80MO2. Rates of nitrogen on wheat - soil test – 80BR3, 80ES14. 80KA2, 80NO2, 80TS1. Rates of nitrogen on wheat – 80LG26, 80ME2. Rates and sources of N and P for …

Minimum Tillage Investigations. Direct Drilling Trials - Moora Office. Evaluation Of Stubble Management Techniques. Rye Grass Control Under Direct Drilling. Miscellaneous Chemical Trials. Deep Ripping., R. J. Jarvis

Experimental Summaries - Plant Research

Minimum Tillage Investigations - 77A16. Rotational site - 77A43, 77E52, 77MT51, 77WH88. Continuous Cropping Site - 78BA42, 77E18, 77MT15, 77WH17. Heavy land continuous cropping site - 77Ml3. Light land continuous cropping site - 78M25. Direct Drilling Trials - Moora Office. Round Hill, Miling, Dalwallinu, East Wubin. Evaluation of Stubble Management Techniques. Stubble management – WHRS light land - 79M7, 79WH6. Rye grass Control Under Direct Drilling. Ryegrass herbicides - dd/conventional - 80N22. Tillage systems x ryegrass control - 80LG23. Trifluralln/direct drilling - 80LG24. Trifluralin/direct drilling - 80LG25. Miscellaneous Chemical Trials. Hoegrass compatibility trial 80LG31. Early broadleaf weed control in wheat …

Regional Trials At Esperance, M Da Bolland

Experimental Summaries - Plant Research

Trials on Salmon Gums Research Station. The trials on the research station are aimed at making the maximum use of the rainfall for cropping. On the heavy Kumarl soils the trials include fallow trials, furrow seeding trials, seeding rate and time of seeding trials, and trials assessing methods of getting the crops in as early as possible; these trials being repeated on fallow and ley Kumarl soil. On the sandy surfaced soils the trials assess methods of sowing the crops as early as possible, and checking if there are different nitrogen requirements for cereals sown by minimum tillage or mechanical …

Part I. Take-All Of Cereals, Rhizoctonia Bare Patch. Part Ii. Minimum Tillage Trials 1980, G C. Macnish

Experimental Summaries - Plant Research

A. Take-all of cereals. Take-all survey. Effect of nitrogen sources on take-all - 76LG25 (N = 50 kg/ha), 77E4 (N = 25 kg/ha), 77MT19 (N = 45 kg/ha), 77MT18 (N = 45 kg/ha) Oats (1977 Results).

Take-all and the economics of Agras No. 1 (1979 Results) – 79BA30 (N = 10 to 90), 79ES14 (N = 10 to 90), 79LG4 (N = 10 to 90).

Take-all, row spacing and rates of Agras No. 1 - 79ES41 (1979 Results).

Take-all and paddock grass history - 68NA1, 80NA58, 80NA59.

Take-all following cleaning crops - 79El2.

Take-all build-up on new land rotation - …

1979 Trial - Doublegee Seed Dormancy, Lupins Weed Control, Doublegee Control In Pasture, D J. Gilbey

Experimental Summaries - Plant Research

74C7 Doublegee seed longevity X cultivation, Chapman Research Station 75WH65 Doublegee seed longevity X cultivation, Wongan Hills Research Station 75WH66 Doublegee seed longevity X depth, Wongan Hills Research Station 76C9 Doublegee seed longevity X depth, Chapman Research Station 76KA8 Doublegee seed longevity X depth, Katanning Townsite 74A4 Effect of double cropping, shallow dry cultivation and spraying pasture on viable doublegee seed, Avondale Research Station 79C24 Lupin tolerance to herbicides - Illyarrie, Chapman Research Station 79C25 Lupin tolerance to herbicides – Unicrop, Chapman Research Station 79C26 Lupin tolerance to herbicides – Ultra, Chapman Research Station 79C27 Lupin tolerance to herbicides – …

Deep Ripping Trial, Wongan Hills Research Station/ Avondale Research Station. Rates Of Ryegrass And Rates Of N On Wheat Yield, M. L. Poole

Experimental Summaries - Plant Research

80WH52, 80A44, 80WH53. 80M41, 80M42.

Long Term Roatation Trials. Lupins: Wheat Rotation. Continuous Cropping With Nitrogenous Fertiliser., I Rowland

Experimental Summaries - Plant Research

Long term rotation trials - 66M29, 67C13, 67N4, 68E5, 68SG5, 73SG16. Lupins: whet rotation - 79GE36, 79GE37. Continuous cropping with nitrogenous fertiliser - 80NA6.