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Nitrogen effect on yield and kernel protein content of sweet corn zea mays grown on sandy soils



Nitrogen effect on yield and kernel protein content of sweet corn zea mays grown on sandy soils



Communications in Soil Science & Plant Analysis 14(7): 585-600



Early spring application of N to Iowa [USA] sandy, leachable soils results in reduced sweet corn yields and kernel protein content. Split N applications are used to coincide with crop N demand. Nitrapyrin, a nitrification inhibitor, if applied with urea might provide high yields and kernel protein levels when applied at planting. N rate increased yield, ear leaf N concentration and kerneal protein content in 1976 and 1978, with the optimum rate dependent on the year and soil N residual. Urea, with or without nitrapyrin, significantly enhanced yield 13%, early leaf N concentration 17% and kernel protein content 9% as compared with Ca(NO3)2 for both years. High leaching loss of NO3-N occurred with the Ca(NO3)2 source as compared with urea alone. Kernel protein concentration correlated well with ear leaf N concentration (r = 0.74) and yield (r = 0.61). Ear leaf K content was not affected by N rate or source, but Ca(NO3)2 enhanced uptake of Ca and Mg as compared with the urea sources. Urea, with nitrapyrin, decreased leaf Mg content in 1978, but not in 1976, as compared with urea alone.

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