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Yield and Growth of Corn as Affected by Poultry Manure¹

ABSTRACT

The effect of poultry manure on yield and growth of corn was studied on an Elkton sandy loam, typic ochraquults clayey mixed mesic, in southern Delaware. Plots with six levels of manure 0, 22, 56, 90, 168, and 224 metric tons/ha and a fertilizer treatment 224-5-186 kg/ha (N-P-K) and 22 metric tons/ha manure plus 224-5-186 kg/ha (N-P-K) were laid out in a randomized block design with four replications in 1971.

Germination and yield of corn (Zea mays L.) were reduced by higher rates of poultry manure. Leaf mineral nutrition, the nitrogen fraction, organic acids, total ethanol soluble sugars, leaf water potential, leaf area index, soil salinity, and soil test data were determined to find the factors that contributed most to the yield reduction. Excessive soil salinity was considered to be the most important cause of the yield reduction following the application of high rates of poultry manure.

Key Words: salinity • nutrient content

¹ Published with the approval of the Director of the Delaware Agricultural Experiment Station as Misc. Paper No. 702. Contribution No. 48 of the Department of Plant Science, University of Delaware, Newark, DE 19711. Research supported in part by funds from Hercules, Inc., Wilmington, Del. Presented before division A-5 of the American Society of Agronomy, 12 November 1973.

² Graduate Assistant and Assistant Professor, Dep. Plant Sci., Coll. of Agr. Sci., Univ. of Del.

Received for publication May 10, 1974.

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