HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Hooker, M. L. Articles by Gallagher, P. Search for Related Content PubMed Articles by Hooker, M. L. Articles by Gallagher, P. Agricola Articles by Hooker, M. L. Articles by Gallagher, P.

Effects of Long-Term, Annual Applications of N and P on Corn Grain Yields and Soil Chemical Properties¹

Maximum yield production in monocultural cropping systems requires annual applications of fertilizer to maintain adequate soil nutrient levels. The rates of applied N and P fertilizers may vary from conservative to excessive applications. Experiments were established at two locations (Ardic Haplustoll and Aridic Argiustoll) to evaluate the effects of annual applications of N and P, over a period of several years, on corn (Zea mays L.) grain yields and the accumulation of these nutrients in the soil. Maximum grain yields were consistently maintained with N applications of 134 to 180 kg/ha and P applications of 20 kg/ha. Applications of N-rates higher than the optimum resulted in accumulations of residual NO^–₃-N and subsequent leaching. At one location the soil P level was maintained constant for 21 years with the 20-kg P rate. A similar trend was observed for the initial 10 years of the second experiment, however, for the last 4 years soil-P has increased at the rate of 4 ppm annually.

Key Words: Long-term fertility • Residual fertilizers • Fertilizer-use efficiency

² Assistant professor, associate professor, associate professor, and Farmland Industries research scientist (formerly assistant professor, Kansas State University.)

Received for publication April 22, 1982.

This article has been cited by other articles:

				M. T. Siddique and J. S. Robinson Differences in Phosphorus Retention and Release in Soils Amended with Animal Manures and Sewage Sludge Soil Sci. Soc. Am. J., July 1, 2004; 68(4): 1421 - 1428. [Abstract] [Full Text] [PDF]

				T. V. Karpinets, D. J. Greenwood, and J. T. Ammons Predictive Mechanistic Model of Soil Phosphorus Dynamics with Readily Available Inputs Soil Sci. Soc. Am. J., March 1, 2004; 68(2): 644 - 653. [Abstract] [Full Text] [PDF]

				A. N. Sharpley Soil Mixing to Decrease Surface Stratification of Phosphorus in Manured Soils J. Environ. Qual., July 1, 2003; 32(4): 1375 - 1384. [Abstract] [Full Text] [PDF]