Time of Nitrogen Application and Phosphorus Effects on Growth, Yield, and Fruit Quality of Pecan

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  • 1 Department of Horticulture and Landscape Architecture, Oklahoma State University, Stillwater, OK 74078

March vs. October N applications in factorial combination with two P rates were evaluated on two pecan [Carya illinoinensis (Wangenh.) C. Koch] cultivars. Leaf N concentrations were not affected by N application time. However, yield of `Hayes' was increased during 4 of 7 years and cumulative yield was increased 37% when N was applied during October compared to March. Yield of `Patrick' and individual nut weight and kernel percentage of `Hayes' and `Patrick' were not affected by N application time. Phosphorus application increased leaf P concentration 5 of 7 years during the study. Shoot growth, yield, individual nut weight, and kernel percentage were not affected by P application.

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