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Articles 10831 - 10860 of 11977
Full-Text Articles in Physical Sciences and Mathematics
Causes Of Soil Acidity, W M. Porter
Causes Of Soil Acidity, W M. Porter
Journal of the Department of Agriculture, Western Australia, Series 4
The introduction of agriculture into australia has caused many of our soils to become more acid faster than they would have otherwise.
In Europe and other parts of the world, soil acidification is accepted as a normal by-product of a successful agricultural system. Lime* is widley used to neutralise the acids added as a result of agricultural practices.
In Western Australia, lime applications will be needed more frequently in the future, although maybe not in the same volumes as in Europe.
Soil Acidity And Liming In The Lower Great Southern, R N. Glencross, M. G. Clarke
Soil Acidity And Liming In The Lower Great Southern, R N. Glencross, M. G. Clarke
Journal of the Department of Agriculture, Western Australia, Series 4
In the 375 to 750 millimetre rainfall area of the Lower Great Southern, reports of loss of subterranean clover from established pastures, reduced carrying capacity for sheep and increasing soil acidity lead to the establishment in 1981 of a research programme into the effects of soil acidity on pasture productivity in that region.
Nebraska Mineral Operations Review, 1983, Raymond R. Burchett, Duane A. Eversoll
Nebraska Mineral Operations Review, 1983, Raymond R. Burchett, Duane A. Eversoll
Conservation and Survey Division
No abstract provided.
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation And Survey Division
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation And Survey Division
Conservation and Survey Division
No abstract provided.
Inventory Of Irrigation Water Use In Box Butte County, Nebraska 1981, D. R. Lawton, L. L. Leahon
Inventory Of Irrigation Water Use In Box Butte County, Nebraska 1981, D. R. Lawton, L. L. Leahon
Conservation and Survey Division
No abstract provided.
1984 County Gravity Survey, Complete Gravity Listings, Raymond R. Burchett
1984 County Gravity Survey, Complete Gravity Listings, Raymond R. Burchett
Conservation and Survey Division
No abstract provided.
Annual Installation Of Irrigation Wells In Nebraska Through 1983, Conservation Survey Division
Annual Installation Of Irrigation Wells In Nebraska Through 1983, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division
Annual Departures From Average Annual Precipitation In Nebraska, 1850-1983, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division
Annual Outflow Of Water From Nebraska, 1950-1983, Conservation Survey Division
Conservation and Survey Division
No abstract provided.
Effect Of Irrigation On Corn, Soybeans And Alfalfa Yields In Kentucky, Lloyd W. Murdock
Effect Of Irrigation On Corn, Soybeans And Alfalfa Yields In Kentucky, Lloyd W. Murdock
Soil Science News and Views
Irrigation is not widely used in Kentucky for two reasons: 1) high average yearly rainfall, and 2) lack of easily accessible and dependable water sources. However, even with the high yearly rainfall, droughts do occur during the growing season. According to past history, they are more likely to occur in West Kentucky than Central Kentucky and least likely to occur in East Kentucky.
Disposal Of Household Wastewater In Soils Of High Stone Content (1981-1983), E. M. Rutledge, C. R. Mote, D. T. Mitchell, M. S. Hirsch, M. D. Harper, H. D. Scott, C. L. Griffis
Disposal Of Household Wastewater In Soils Of High Stone Content (1981-1983), E. M. Rutledge, C. R. Mote, D. T. Mitchell, M. S. Hirsch, M. D. Harper, H. D. Scott, C. L. Griffis
Technical Reports
Four experimental filter fields were constructed with built-in monitoring equipment in Nixa soils. These soils contain many chert fragments and a fragipan about 60 cm below the soil surface. The fragipan restricts downward movement of water and is the designlimitingfeature. The four filter fields were: 1. A "standard" filter field, 76 cm deep. The bottom of the trench was in the fragipan. 2. A "modified standard" filter field, 30 cm deep. The bottom of the trench was above the fragipan. 3. A "modified pressure" filter field, 40 cm deep. The bottom of the trench was above the fragipan. In addition, …
Returning Pik Land To Grain Production, Wilbur W. Frye
Returning Pik Land To Grain Production, Wilbur W. Frye
Soil Science News and Views
With the end of the 1983 PIK program, much of the acreage that was in the program will be returned to grain production. Farmers who planted cover crops on their PIK fields in 1983 and who plan to return them to grain production in 1984 will be faced with deciding whether to use no-tillage or conventional tillage. The cover crops will provide mulch for no-tillage crops which may be an asset but can contribute to problems as well. Also, weed problems may be worse on PIK land and more difficult to control with no-tillage than with conventional tillage. The decision …
Fertilization Management In Double Cropping, John H. Grove
Fertilization Management In Double Cropping, John H. Grove
Soil Science News and Views
Double crop systems are being widely adopted by grain and silage producers in Kentucky. The wheat-soybean grain intensive system accounts for nearly 750,000 acres of cropland in the state each year. Alternative silage systems for beef and/or dairy producers involve a fall seeded small grain (wheat, barley, triticale) that is harvested at an immature stage of growth. Immediately afterward a crop for silage (corn, grain sorghum) or grain (soybean, grain sorghum) is planted. When reduced and no-tillage management practices are used the timeliness of planting is improved and losses of surface soil moisture are minimized as the second crop starts …
Modeling Erosion On Long Steep Slopes With Emphasis On The Rilling Process, Michael C. Hirschi, Billy J. Barfield, Ian D. Moore
Modeling Erosion On Long Steep Slopes With Emphasis On The Rilling Process, Michael C. Hirschi, Billy J. Barfield, Ian D. Moore
KWRRI Research Reports
A model of soil erosion, known as KYERMO, is presented which emphasizes those processes which are important on steep slopes. Particular emphasis is placed on modeling rill development and geometry since this is the least understood process in erosion mechanics. The model requires an input rill pattern.
Rainfall inputs to the model require the use of breakpoint rainfall and kinetic energy. Surface storage is calculated based on random roughness data of Linden (1979). Infiltration is modeled by use of the two layer Green-Ampt-Mein-Larson model as proposed by Moore and Eigel (1981). Runoff is related to rainfall excess and surface storage …
Improved Methods And Guidelines For Modeling Stormwater Runoff From Surface Coal Mined Lands, Michael E. Meadows, George E. Blandford
Improved Methods And Guidelines For Modeling Stormwater Runoff From Surface Coal Mined Lands, Michael E. Meadows, George E. Blandford
KWRRI Research Reports
The investgations, developments and guidelines for several hydrologic modeling strategies are presented. Investigations were conducted to determine appropriate event curve numbers for surface mined disturbed watersheds; and performance of four synthetic unit hydrograph models (SCS curvilinear, SCS single triangle, Williams and TVA double triangle) on 38 USDA experimental watersheds in 14 physiographic provinces using in excess of 270 events. A second test using only the SCS curvilinear unit hydrograph on 11 small watersheds and 48 events was conducted to investigate the excess rainfall pattern simulated with the curve number model. A procedure for developing a unit hydrograph using the time …
Effect Of Lime Quality On Soil Ph Changes, Monroe Rasnake
Effect Of Lime Quality On Soil Ph Changes, Monroe Rasnake
Soil Science News and Views
Quality of a liming material depends primarily on two factors - purity and size of the individual particles. Purity is an indication of how much active material is present. Particle size determines how fa st the lime can dissolve and react with soil acidity.
Hydrogeology Of Butler County, Nebraska, Marilyn H. Ginsberg
Hydrogeology Of Butler County, Nebraska, Marilyn H. Ginsberg
Conservation and Survey Division
No abstract provided.
Policy Issue Study On Supplemental Water Supplies, Clinton Vonseggern, Bob Kuzelka
Policy Issue Study On Supplemental Water Supplies, Clinton Vonseggern, Bob Kuzelka
Conservation and Survey Division
No abstract provided.
Effect Of Nitrogen Fertilization On Fall Stockpiled Ky 31 Fescue, Kenneth L. Wells
Effect Of Nitrogen Fertilization On Fall Stockpiled Ky 31 Fescue, Kenneth L. Wells
Soil Science News and Views
Much interest has developed during the past several years on improving utilization of tall fescue by accumulating its growth during the fall and delaying grazing until late fall and winter. This technique takes advantages of the buildup of sugars in the herbage which normally takes place as seasonal temperatures cool to near the freezing point. UK forage research has shown that content of sugars in tall fescue herbage can increase from around 8 percent in late summer to around 20 percent after the first few frosts have occurred in late fall. This sugar buildup greatly increases the feed value of …
Predicting Infiltration And Surface Runoff From Reconstructed Spoils And Soils, Larry G. Wells, Andrew D. Ward, Ronald E. Phillips
Predicting Infiltration And Surface Runoff From Reconstructed Spoils And Soils, Larry G. Wells, Andrew D. Ward, Ronald E. Phillips
KWRRI Research Reports
A laboratory system was fabricated to measure infiltration and runoff from spoil and soil profiles constructed in rectangular bins. Construction, calibration and operation of a rainfall simulator is discussed and instrumentation used to measure transient infiltration and transmittance of water through experimental profiles is described.
Spoil and soil materials from surface mines in Eastern and Western Kentucky were transported to the laboratory and used in constructing experimental profiles in rectangular bins (0.91 x 1.83 x 1.07 m). An extensive series of infiltration experiments were conducted utilizing a rainfall simulator and soil moisture monitoring instrumentation. A dual probe gamma density gauge …
Soybean Response To Fertilization, Monroe Rasnake
Soybean Response To Fertilization, Monroe Rasnake
Soil Science News and Views
When can you expect soybeans to respond to fertilization? How large is a response likely to be? How much fertilizer will be needed to obtain the maximum economic response? These are questions that College of Agriculture personnel must answer in making recommendations. Farmers should also consider these questions when deciding how much fertilizer to use.
Effects Of Surface Application Of Dairy Manure On The Infiltration Rate And Quality Of Surface Runoff, Joseph L. Taraba, I. J. Ross, John D. Bottom, Bill J. Barfield
Effects Of Surface Application Of Dairy Manure On The Infiltration Rate And Quality Of Surface Runoff, Joseph L. Taraba, I. J. Ross, John D. Bottom, Bill J. Barfield
KWRRI Research Reports
Dairy manure was surface spread on 12 ft x 12 ft plots on an established fescue pasture in the summer and fall of 1981 and 1982. The soil was a Maury silt loam. A simulated rainfall was applied to plots to test the effects of nitrogen loading rate (75, 150, and 300 #N/acre) time delay between manure application and the simulated rainfall events (0, 3, 6, 24, 48, 96 hours and a 120 hour test repeated on 0 hr plot with 300 #N/acre), and type manure (semi-solid - 1981 and liquid - 1982) on the concentrations of pollutants in the …
Groundwater Levels In Nebraska, 1982, Martin S. Johnson, Darryll T. Pederson
Groundwater Levels In Nebraska, 1982, Martin S. Johnson, Darryll T. Pederson
Conservation and Survey Division
No abstract provided.
Nitrogen Placement For No-Till Corn, Kenneth L. Wells
Nitrogen Placement For No-Till Corn, Kenneth L. Wells
Soil Science News and Views
An estimated 18 to 20 percent of all corn grown in Kentucky is no-till planted. This 400 to 500 thousand acres is directly planted into sod, residues from the previous year, or a winter cover crop. Many field trials have been conducted by University of Kentucky agronomists during the past 15 years to determine nitrogen fertilization practices best suited for this kind of corn production. These recommendations are published annually in "AGR-1 Lime and Fertilizer Recommendations," and call for 25 lbs more actual fertilizer N per acre than conventional corn. This is largely justified by: (1) a greater potential for …
Disposal Of Household Wastewater In Soils Of High Stone Content (1977-1980), E. M. Rutledge, C. R. Mote, M. S. Hirsh, H. D. Scott, D. T. Mitchell
Disposal Of Household Wastewater In Soils Of High Stone Content (1977-1980), E. M. Rutledge, C. R. Mote, M. S. Hirsh, H. D. Scott, D. T. Mitchell
Technical Reports
Two experimental septic tank filter fields were constructed with built-in monitoring equipment in Nixa soils. These soils contain many chert fragments and a fragipan about 60 cm deep which restricts downward water movement and is the design-limiting feature. The standard filter field (76 cm deep) was built into the fragipan and the modified standard filter field (30 cm deep) was placed above it. During 30 months' observation, the modified standard performed better than the standard filter field. Maximum rise of effluent in the standard and modified standard came within 11 and 19 cm of the soil surface, respectively. Performance of …
Annean Station Management Plan, A A. Mitchell
Annean Station Management Plan, A A. Mitchell
Resource management technical reports
Annean Station's carrying capacity has been estimated at 8,340 sheep on its 168,539 hectares. The halophyte pastures of Carnegie Land System were in good condition while those of Mileura Land System were in poor condition. The wandarrie pasture of the Belele Land System was in fair to poor condition. This system comnprises 34 per cent of Annean's area and is estimated as capable of presently carrying 2,900 stock.
Anhydrous Ammonia Use For Corn, William O. Thom
Anhydrous Ammonia Use For Corn, William O. Thom
Soil Science News and Views
Anhydrous ammonia is the most concentrated form of nitrogen fertilizer available to corn producers in many areas of Kentucky. It is a simple chemical compound made up of one part nitrogen and three parts hydrogen (NH3), existing as a gas at normal outdoor temperatures. This makes it necessary to store and handle the material in closed containers under pressure. The product contains 82% nitrogen, making it one of the highest analysis and most economical fertilizers available for corn production.
Current Research On Band Application Of Fertilizer To Burley Tobacco, J. L. Sims
Current Research On Band Application Of Fertilizer To Burley Tobacco, J. L. Sims
Soil Science News and Views
Present Status: Generally, past research conducted in the United States has shown that only one-half to two-thirds as much fertilizer is required to produce maximum crop yields when the fertilizer is properly banded as when it is broadcast. However, the magnitude of plant response to banding compared to broadcast applications varies widely with soil nutrient levels, soil temperature, soil pH, and the mobility of the nutrient being applied. Greatest benefits from banding result from (a) applications to soils having low or very-low soil test levels of the nutrient in question, (b) applications to crops grown in cool climates, (3) applications …
Chemical Sealing Of Small Earth Dams Using Sodium Tripolyphosphate, R G. Pepper
Chemical Sealing Of Small Earth Dams Using Sodium Tripolyphosphate, R G. Pepper
Technical Bulletins
As the seepage rate of 3.1 mm/d was considered too high, sodium tripolyphosphate (STPP) was dissolved in the dam water in an attempt to disperse the clay and reduce the hydraulic conductivity. Application of STPP altered the original sealing layer at first and, as seepage progressed, a new seal started to form at a depth of 0.8 m below the batter. The seepage rate was reduced to 0.39 mm/d and the hydraulic conductivity of this new seal was 2.0 x 10-9 m/s.