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This article in SSSAJ

  1. Vol. 65 No. 2, p. 376-384
     
    Received: Jan 18, 2000
    Published: Mar, 2001


    * Corresponding author(s): apmallar@iastate.edu
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doi:10.2136/sssaj2001.652376x

Deep Banding Phosphorus and Potassium Fertilizers for Corn Managed with Ridge Tillage

  1. Rogerio Borges and
  2. Antonio P. Mallarino *
  1. Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

Abstract

Broadcast fertilization leads to stratification of soil P and K in the ridge-till system, which may reduce fertilizer use efficiency. This study evaluated the response of corn (Zea mays L.) to broadcast or deep-band (15- to 20-cm depth) placements in 15 site–years. Fertilization rates were 0 to 56 kg P ha−1 and 0 to 132 kg K ha−1 Soil-test P (STP) and K (STK) were higher in the top 15-cm layer of the ridges. Phosphorus increased early plant growth (V5 stage) in five sites, early P uptake in nine sites, and grain yield in seven sites. Yield was increased by P when STP was <22 mg P kg−1 (Bray-1) in the top 15-cm layer of ridges or <18 mg P kg−1 in the top 15 cm of ridges and valleys. The P placements seldom differed (the deep-band P was better in one site). Potassium increased growth in 6 sites, K uptake in 14 sites, and grain yield in nine sites. The deep-band K increased yield over the broadcast K in four sites. The yield response to broadcast K across sites was not correlated with STK, but the response to deep-band K was negatively and linearly correlated with STK from various sampling positions. Corn responded to deep-band K in soils with above-optimum STK according to current soil-test interpretations. The results showed that both placements usually were similarly effective for P, and that deep banding often was superior for K.

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Copyright © 2001. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.65:376–384.