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This article in AJ

  1. Vol. 80 No. 5, p. 773-777
     
    Received: Oct 2, 1987
    Published: Sept, 1988


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doi:10.2134/agronj1988.00021962008000050016x

Effect of Added Urea and Potassium Chloride on Yields of Corn over Four Years and on Soil Potassium

  1. A. F. MacKenzie ,
  2. L. E. Phillip and
  3. P. C. Kirby
  1. D ep. of Renewable Resources, Faculty of Agric., Macdonald College of McGill Univ., 21111 Lake Shore Rd., Ste. Anne de Bellevue, P.Q., Canada H9X 1C0
    D ep. of Animal Sci., Faculty of Agric., Macdonald College of McGill Univ., 21111 Lake Shore Rd., Ste. Anne de Bellevue, P.Q. Canada H9X 1C0
    D ep. of Renewable Resources, Faculty of Agric., Macdonald College of McGill Univ., 21111 Lake Shore Rd., Ste. Anne de Bellevue, P.Q. Canada H9X 1C0

Abstract

Abstract

Silage corn (Zea mays L.) is a major crop in eastern Canada, and yield increases due to added N and K have been noted. However, possible interaction between N and K, and the effect of weather conditions on yield response and maturity must be determined for rational use of N and K fertilizers. A fertilizer experiment on the production of silage corn using urea and KCI was established on an Ormstown silty clay loam (fine silty, mixed, non-acid, mesic Typic Humaquept) for 4 yr. Rates of fertilizer were 0, 90, and 180 kg N ha−1, and 0, 60, and 120 kg K2O in the first 2 yr, increased to 0, 120, and 240 kg K2O ha−1 in the last 2 yr. Yields of silage corn were increased with N in 3 yr and with K in 2 of the 4 yr. An interaction between N and K was found in the years when there were yield responses to added KCl, indicating that increased crop yields with K occurred only at relatively high N rates. Added N increased dry matter contents of corn plants, whereas added K reduced dry matter contents at low rates of N. Relative yields of the control plots over the high N-K plots were correlated positively with precipitation during the growing season. Added urea when combined with added KCl increased exchangeable and soluble K, probably due to reduced K fixation by illite, mica and vermiculite minerals in the soil.

Contribution from the Dep. of Renewable Resources and the Dep. of Animal Sci., Faculty Of Agric., Macdonald College of McGill Univ.

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