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Showing 1 to 20 of 59 for “"soil test"”.
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Relationships of soil test phosphorus with soil properties and phosphorus forms
A comprehensive approach to soil P management in agricultural systems requires a balance between nutritional enhancement of the soil and a reduction in adverse consequences on the environment. Evaluation of forms in which P is present in the soil, dynamics of P transformation across these forms, …
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Effects of extraction time and phosphorus speciation on soil test phosphorus (STP) in Illinois agricultural soils
The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.
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Effects of Corn (Zea mays L.) Stover Removal and Leaching on Soil Test and Whole Plant K Levels in Corn and K Fertilization/High-Input Treatments on Soybean Using Site-Specific Management to Increase Soybean (Glycine max) Production in South Dakota
… the potential to reduce exchangeable and soluble soil potassium (K+) needed for optimal plant growth in addition to grain yield. An experiment was conducted in Aurora, SD, USA, to observe the effects of corn stover removal on water soluble and exchangeable soil test K+ (STK) levels and corn grain …
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Full-Season and Double-Crop Soybean Response to Potassium Fertilizer
… response to K on coastal plain and piedmont soils of Virginia, especially in double-crop systems. Nineteen full-season and 14 double-crop soybean experiments were conducted in 2013 and 2014 in Virginia and northeastern North Carolina to determine full-season and double-crop soybean (with …
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Corn tissue nutrient response related to soil health and fertility
… different factors which include properties of soil health. The push for increasing soil health has raised the question of how soil health and fertility measurements could be combined to improve nutrient management decisions. Attention to nutrient management decisions is critical for …
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Impacts and correction of potassium deficiency in no-till and strip-till soybean and corn production
… sites were generally near or below the current soil test K critical level of 130 mg per kg extractable K, based on sampling histories provided by the cooperators. Sampling in the spring of 2007 confirmed these soil test (ST) K levels. Soybean leaf tissue potassium levels in 2007 were less than …
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Soil and tissue tests for determining nitrogen status of corn
<p>Soil and tissue tests are important tools for adjusting N fertilization rates to maximize the profitability of corn production and(or) minimize the adverse effects of N fertilizers on the environment. When used early in the season, these tools give site-specific information that can be used to …
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Soil properties, lime and phosphorus fertiliser management affecting grass production in Ireland
… P fertiliser recommendations do not account for soil type differences, but large differences in fertiliser P responses can exist across differing soil types. The use of this one size fits all P fertiliser recommendation system can result in the depletion or over supply of P fertilisers compared …
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Soybean Yield and Plant Response to Phosphorus Fertilization
… nutrient for soybean production in South Dakota. Soil tests have been used as a baseline indicator for plant available P and fertilizer recommendations for over a century. Plant nutrient analysis may be used to complement a soil test as a way to validate fertilizer and management practices. …
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Innovations in fertilizer use and agronomic management for greater productivity of corn and soybean
… resulted in greater nutrient demands from the soil and fertilizer, resulting in many soil’s nutrient reserves to be drawn down. With the advent of innovative precision agricultural technologies, fertilizer sources, and management practices, current evolving management practices need to be …
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Liquid swine manure as a phosphorus source for corn-soybean rotation
… evaluate liquid swine manure P application on soil P measured with three routine soil-P tests (Bray-1 P, Olsen, and Mehlich 3 P), and two environmental tests (Iron-oxide and Water extraction). The second study used a strip-trial methodology using precision agriculture technologies and its …
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Phosphorus Losses in Runoff from Virginia Soils
… dissolved P losses in runoff are well related to soil test P (STP), thus, various P loss prediction models incorporate the use of a STP vs. runoff DRP relationship. However, the relationship between STP and runoff DRP will vary based on soil type due to differences in soil properties. The purposes …
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Topsoil thickness impact on corn, soybean, and switchgrass productivity and soil nutrient management
Topsoil thickness, or depth to claypan (DTC), is a major contributing factor to variability in corn (Zea mays L.) and soybean (Glycine max [L.]) yield, profit, and nutrient dynamics on claypan soils. Understanding how and when DTC affects these factors across the landscape is crucial for improving …
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Factors influencing phosphorus losses in agroecosystems dominated by tile drainage
… the effect on phosphorus losses of topography, soil phosphorus, management practices, meteorological conditions, and hydrologic characteristics in agricultural fields and watersheds dominated by tile-drainage in central Illinois. First, tile dissolved reactive phosphorus yields and flow-weighted …
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The Vascular Flora of Bona Glade Natural Area, Dade County, Missouri
… sampling data and subjective field observations. Soil test data for macronutrients and pH from representative localities on the glade reveal very acid sandy loam soils which are relatively infertile. Bedrock is Pennsylvania Channel Sandstone. Some rare or endangered species, such as Geocarpon …
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Phosphate Reactivity in Long-Term Manure Amended Soils in the Ridge and Valley of Virginia
… released in overland flow is related to P form, soil solution P concentration and the release rate of P from soil. Models relating soil test P (STP) to water soluble P (WSP) and the degree of P saturation (DPS) to STP are used in Virginia to estimate P loss potential. Typically the reservoir of …
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Phosphorus Management: An Analysis of the Virginia Phosphorus Index
… runoff, and/or leaching coupled with high soil test P and/or high rate of fertilizer P application. A management tool is needed to identify those fields that have a high transport and source potential to deliver P to surface water. The Virginia P-Index is a mass-based tool that estimates …
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Examination of the Correlation between Shear Strength, California Bearing Ratio, and Index Properties of Fine-grained Soil
… with that of a high-quality crushed stone. This test adopted by transportation agencies and widely used in the design and analysis of pavement. Several agencies developed design thickness chart based on the CBR values of the subgrade. However, CBR test is time consuming and expensive to perform …
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Intensive management of barley in Saskatchewan
… The first experiment consisted of ten tests assessing ICM with three levels of N (0, 50 and 100 kg ha-1) above soil test recommendations, two levels of ethephon (0 and 0.24 kg ha-1) and two levels of propiconazole (0 and 0.125 kg ha-1). Varieties used in ICM tests were Bonanza, Samson, …
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Investigation of the principles of rapid soil tests for available potash and other plant nutrients of Virginia soils: III. selection, development and calibration of rapid chemical soil tests for available potassium, phosphorus, calcium and magnesium
Four rapid soil test extracting procedures for potassium, phosphorus, calcium and magnesium, and one absorption procedure for potassium and phosphorus were compared. The soils studied represented important agricultural soils in the Coastal Plains, Piedmont and the Limestone Valley areas of …
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