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Yield and Nutrient Uptake by Corn (Zea mays L.) for Silage on Two Soil Types as Influenced by Fertilizer, Plant Population and Hybrids¹

ABSTRACT

The influence of corn hybrid on forage yield, nutrient composition, uptake of nutrients and percentage recovery from the fertilizer were studied at three plant populations and four fertilizer rates. Multi-eared hybrids yielded more forage than single-eared hybrids but tall growing hybrids did not always produce more than shorter growing hybrids. Increasing plant population had no significant effect on nutrient composition but did increase yields and uptake of N, P, and K. Corn hybrids differed widely in the amount of fertilizer they recovered. For 7 hybrids of corn, averaging 13,900 lb of dry forage/acre the average uptake of N, P, and K was 177, 25, and 242 lb, respectively. On nonirrigated soils a tall-growing hybrid did not respond to fertilizer or plant population as did a short-growing hybrid.

¹ Florida Agr. Exp. Sta. J. Series no. 2036. Presented before Div. S-4, Soil Sci. Soc. Amer., Nov. 16–19, 1964, at Kansas City, Mo.

² Associate Soils Chemist, Soils Physicist and Soils Chemist, respectively, Florida Agr. Exp. Sta., Gainesville.

Received for publication December 14, 1964. Accepted for publication February 22, 1965.