Nitrogen Rates for Corn on Arkansas Delta Soils PDF Download

Author: J. H. Muir
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 15

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Book Description
The silt loam soils apparently differ in N recommendations for corn production depending on whether the parent material is loessial or alluvial. The loessial silt loam soils appear to have a lower N requirement perhaps due to a lower N loss or more N mineralized from organic matter than the alluvial soils. The alluvial silt loam soils have a higher N requirement than the loessial soils. Nitrogen rates required to produce agronomic optimum yields on silty clay soils are much higher than on coarse testured soils, ranging from 250 to 300 lb/ acre when yield goals are 150 and 175 bu/acre, respectively. Although more N is required on silty clay soils, the additional cost may be neutralized by less need for fertilizer P and K. Thus, corn may be a profitable alternative crop for clayey, poorly drained soils in the Mississippi River delta of Arkansas. The fertilizer N requirement for corn production on the different soils had the following rank: silty clay soils>alluvial silt loam soils>loessial silt loam soils. The actual range of N recommendations (based on Tables 3 and 6) can be defined as 250 to 300 lb/acre for silty clay soils, 175 to 225 lb/acre for alluvial silt loam soils and 125 to 175 lb/acre for loessial silt loam soils. This study indicated that the lb N/bu grain for silty clay, alluvial silt loam and loessial silt loam soils were approximately 2.0, 1.0 and 1.0, respectively. Thus the current recommendations for N rates on corn for silt loam soils are supported by this study; whereas, N rates for corn grown ...