About Us | Help Videos | Contact Us | Subscriptions

Agronomy Journal Abstract -

Potassium Uptake and Recovery by an Upland Rice-Soybean Rotation on an Oxisol


This article in AJ

  1. Vol. 82 No. 2, p. 329-333
    Received: June 12, 1989

    * Corresponding author(s):
Request Permissions

  1. D. W. Gill and
  2. E. J. Kamprath 
  1. C asilla 274, Santa Cruz, Bolivia
    D ep., North Carolina State Univ., Box 7619, Raleigh, NC 27695-7619



A major limitation to improved crop growth on many acid Oxisols is low K availability. A field experiment was conducted in West Sumatra to study the effects of K fertilization of an oxisol under three levels of lime (0.375, 2.25 an 5 t ha−1) on K accumulation of a yearly upland rice (Otyza sativa L.)-soybean (Glycine max L. Merr.) rotation where all above-ground residue was removed. Six K treatments supplied 0 to 240 kg K ha−1 to each crop and lime treatment. Potassium fertilization increased grain yields of rice and soybean and K content of grain and stover of both crops. With both crops a large proportion of the K was present in the stover. Liming had no effect on K accumulation Of rice grain; an inconsistent effect on K accumulation in rice straw; and significantly increased the K content of soybean grain and stover. Upland rice was very efficient in utilizing K applied to that crop as well as residual soil K from previous fertilization. When K rate was greater than 100 kg ha−1 per crop appreciable amounts of K could not be accounted for indicating that the K was lost by leaching. Increases in exchangeable K with K fertilization only occurred in the 0- to 30-cm depth.

Supported in part by the US AID and in cooperation with Centre for Soils Research, AARD, Bogor, Indonesia.

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

Copyright © .