Yield and Growth of Corn as Affected by Poultry Manure
1975
Shortall, J Glenn | Liebhardt, William C.
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.
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