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Nitrogen Rates for Cotton in Alabama’s Long-Term Experiments

C.C. Mitchell


 
ABSTRACT

In order to verify standard N rates for cotton in Alabama soils, long-term soil fertility experiments with N rate variables on cotton at five locations were summarized from 1992 through 1998. The results support the current standard N recommendations used on soil test reports. For most sandy and loamy Alabama soils, the standard recommendation is a total of 90 (±30) pounds N per acre during the growing season; 60 (±30) pounds N per acre is standard for the deep, red, silt and clay loams of the limestone valleys of North Alabama. Cotton following a good soybean or peanut crop will benefit from some residual N but predicting this response is difficult. While N recommendations based on a yield goal may apply for some crops, this clearly is not the case with non-irrigated cotton in Alabama. A comparison of a Bollgard® variety (Deltapine NuCotn 35B) and a similar conventional variety (Deltapine DP5690) at one location for 3 years resulted in 85 pounds lint/acre/year higher yields for the Bollgard® variety. Producers should follow the standard N recommendation on new fields and make adjustments as experience and cropping systems dictate.



Reprinted from Proceedings of the 2000 Beltwide Cotton Conferences pp. 1388 - 1392
©National Cotton Council, Memphis TN

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Document last modified Saturday, Jun 17 2000