About Us | Help Videos | Contact Us | Subscriptions

Agronomy Journal Abstract -

Soybean Response to Potassium Fertility under Four Tillage Systems


This article in AJ

  1. Vol. 80 No. 1, p. 5-8
    Received: Mar 16, 1987

    * Corresponding author(s):
Request Permissions

  1. B. L. Vasilas ,
  2. R. W. Esgar,
  3. W. M. Walker,
  4. R. H. Beck and
  5. M. J. Mainz
  1. D ep. of Plant Sci., Univ. of Delaware, Newark, DE 19717–130
    P lant and Earth Sciences Dep., Univ. of Wisconsin-River Falls, River Falls, WI 54022
    D ep. of Agronomy, Univ. of Illinois, Urbana, IL 61801



Because tillage affects root growth and activity, it affects the ability of plants to utilize soil and fertilizer nutrients. It has not been determined if K fertility recommendations developed for clean tillage systems are appropriate for reduced tillage systems. Therefore, an experiment was conducted on a Muscatine silt loam (fine-silty, mixed, mesic Typic Haplaquoll) and a Sable silty clay loam (fine-silty, mixed mesic Aquic Argiudoll) to determine the response of soybean [Glycine max (L.) Merr.] cultivars Williams 82 and Century to three levels of soil K fertility under four tillage systems over 2 yr. The tillage systems were moldboard plow (fall plowed plus spring disk), chisel plow (fall chisel plowed plus spring disk), spring disk, and no-till. Soil K treatments were 336 kg exchangeable K ha−1, 336 kg exchangeable K ha−1 plus 73 kg banded K ha−1, and 560 kg exchangeable K ha−1. A corn (Zea mays)-soybean rotation was used. Grain yields were similar for the moldboard plow, chisel plow, and disk systems. Grain yields were consistently lower for the no-till system. This response was greatest for the cultivar Century in a year when herbicide carryover and Phytophthora (Phytophthora megasperma) damage under no-till reduced final plant populations by 44% compared to that with the moldboard plow system. Increasing the exchangeable soil K level from 336 to 560 kg ha−1 increased grain yields of Century during a dry growing season. Tillage did not affect the magnitude of response, and banded K had no effect on grain yield. We concluded that the tillage system should not influence K fertility recommendations for soils such as these.

Contribution of the Dep. of Agronomy and the Agric. Exp. Stn., Univ. of Illinois

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .