Titlebook: Improving Potassium Recommendations for Agricultural Crops; T. Scott Murrell,Robert L. Mikkelsen,Michael L. Th Conference proceedings‘‘‘‘‘

Adulterate

Inputs: Potassium Sources for Agricultural Systems,trated enough to be economical to transport long distances. The global reserves for their production have an estimated lifetime of thousands of years. This chapter emphasizes considerations for using various commercial fertilizer sources.

平常

Broadening the Objectives of Future Potassium Recommendations,ce. Recognizing the potential role of these plant factors may help reconcile response inconsistencies based solely on soil test information, and improve future K recommendations. Finally, we hope to highlight knowledge gaps and opportunities for additional integrated soil–plant K research.

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Inputs: Potassium Sources for Agricultural Systems,igation water, runoff, erosion, as well as seeds, cuttings, and transplants. Accounting for all inputs is seldom routinely done on the farm. Many K inputs have variable concentrations, making estimations difficult. Estimates for added K are provided in some planning documents and can be used where t

peak-flow

Outputs: Potassium Losses from Agricultural Systems,o the wider environment, and so they have received little attention. Nevertheless, K is very soluble and so can be leached to depth or to surface waters. Also, because K is bound to clays and organic materials, and adsorbed K is mostly associated with fine soil particles, it can be eroded with parti

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伟大

Potassium Use Efficiency of Plants,1) agronomic K use efficiency (KUE), which is defined as yield per unit K available to a crop and is numerically equal to the product of (2) the K uptake efficiency (KUpE) of the crop, which is defined as crop K content per unit K available and (3) its K utilization efficiency (KUtE), which is defin

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会议

Considering Soil Potassium Pools with Dissimilar Plant Availability,o as “fixed” or “nonexchangeable”) K, and structural K in primary minerals. However, this four-pool model and associated terminology have created confusion in understanding the dynamics of K supply to plants and the fate of K returned to the soil in fertilizers, residues, or waste products. This cha

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Using Soil Tests to Evaluate Plant Availability of Potassium in Soils,ion of a sample of soil representative of a field or agronomic management unit and, by way of extraction using chemical reagents, determination of the quantity of a nutrient that can be related to plant uptake or yield. Normally only a small fraction of the total quantity of the nutrient present in