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This article in AJ

  1. Vol. 81 No. 2, p. 178-184
     
    Received: Dec 28, 1987


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doi:10.2134/agronj1989.00021962008100020008x

Band Spacing Effects of Dual-Placed Nitrogen and Phosphorus Fertilizers on Corn

  1. B. Eghball and
  2. D. H. Sander 
  1. Dept. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583

Abstract

Abstract

Band spacing of P fertilizer potentially affects many factors which influence fertilizer P efficiency. Band spacing affects soil-P fertilizer contact, probability of root-P fertilizer contact, the time that roots contact the P fertilizer, the distribution of P fertilizer in the band, and energy requirement during application. Four field experiments were conducted to evaluate the effect of band spacing of dual-placed N and P fertilizers on corn (Zea mays L.) grain yield and P uptake. Four band spacings of 30, 45, 60 and 75 cm were applied with three P application rates in 1983 and 1984, and five rates in 1986. Two application depths of 7.5 and 15 cm were applied in 1983 and 1984. The N rates were 200 kg N ha−1 in 1983 and 1986, and 75 and 150 kg N ha−1 in 1984. Applied P was less effective and N more effective in terms of grain yield as band spacing increased indicating a different optimum band spacing for P than for N. This caused the net effect of band spacing of dual-applied N and P fertilizers to be nearly neutral. Seven-leaf stage and ear-leaf P were not affected by applied P at the high N application rate, but at the low N rate P concentrations increased as P rate increased indicating the importance of adequate N for P uptake early in the growing season. The wide band spacing of 75 cm performed poorly in grain yield response to applied N at the high N rate compared to the low N rate probably because of loss of N during application. Band spacing of N and P fertilizers did not cause significant variation in corn growth. Plants growing directly over the dual-placed band did not yield more or less than other plants regardless of band spacing.

Contribution from Nebraska Agric. Res. Div. Journal no. 8528. Appreciation is given to Potash and Phosphate Institute for partial support of this research.

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