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This article in AJ

  1. Vol. 78 No. 6, p. 947-950
     
    Received: July 22, 1985
    Published: Nov, 1986


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doi:10.2134/agronj1986.00021962007800060002x

Soybean Response to Tillage and Nitrogen, Phosphorus, and Potassium Fertilization1

  1. M. P. Bharati,
  2. D. K. Whigham and
  3. R. D. Voss2

Abstract

Abstract

Conservation tillage is being increasingly recommended as a means of reducing both cost of tillage and soil erosion. A study was conducted for two years with the objective of evaluating the performance of a determinate soybean [Glycine max (L.) Merr.) cultivar, Sprite, planted in narrow rows on a Nicollet (Aquic Hapludo1ls)-Webster (Typic Haplaquolls) complex, with different tillage systems and different levels of N, P, K fertilization for higher yield. Variables studied included: (i) three tillage systems (disk, chisel plow, and moldboard plow tillage) and (ii) three levels of N, P, and K fertilization (P at 0,74 and 111 kg/ha; K at 0,186, and 279 kg/ha; and N at 0, 135, and 270 kg/ha). Plant population was unaffected by the treatments. Phosphorus and K applications increased soil and leaf P and K contents over time and with application levels. Tillage had no significant effect on grain yield. Lodging was significantly increased by P application. Lodging, plant height, and grain yield were significantly increased by K application. Nitrogen application increased lodging and plant height, but not yield. It was concluded that soybean can be successfully grown with reduced tillage in central Iowa without a yield reduction or change in fertility requirement. Soybean responded to K application when the soil test levels were medium to high.

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