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Possible Causes of Dry Pea Synergy to Corn

Published online by Cambridge University Press:  20 January 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
USDA-ARS, 2923 Medary Avenue, Brookings, SD 57006
*
Corresponding author's E-mail address: randy.anderson@ars.usda.gov
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Abstract

Dry pea improves corn yield and tolerance to weed interference compared with soybean, spring wheat, or canola as preceding crops. To understand this synergy between dry pea and corn, growth and nutrient concentration of corn were examined following dry pea or soybean in sequence. Each corn plot was split into weed-free and weed-infested subplots, with foxtail millet established at one density to provide uniform weed interference. Compared with soybean, dry pea improved corn grain yield 10% in weed-free conditions and corn tolerance to weed interference more than twofold. Dry pea synergy to corn in weed-free conditions was not related to differences in corn development, height, or nutrient status of corn seedlings. When foxtail millet was present, dry pea increased corn height and rate of development late in the growing season compared with soybean. Improved corn tolerance to weed interference was not related to seedling emergence or growth of foxtail millet, as these parameters did not vary with preceding crop. Other biological factors must be involved in dry pea synergy to corn.

El guisante mejora el rendimiento del maíz y su tolerancia a la interferencia de las malezas, comparado con la soya, el trigo de primavera y la colza usados como cultivos anteriores. Para entender la sinergia entre el guisante y el maíz, se examinó el crecimiento y la concentración de nutrientes del maíz sembrado secuencialmente después de guisante o soya. Cada parcela de maíz fue dividida en sub-parcelas: libre o infestada con malezas, con Setaria italica establecida a una sola densidad para proveer una interferencia uniforme de malezas. En comparación con la soya, el guisante mejoró el rendimiento en grano del maíz 10% en condiciones libres de malezas y la tolerancia del maíz a la interferencia de malezas incrementó en más de dos veces. La sinergia del guisante y el maíz en condiciones libres de malezas no estuvo relacionada a diferencias en el desarrollo del maíz, su altura o el estatus nutricional de las plántulas de maíz. Cuando S. italica estuvo presente, el guisante incrementó la altura del maíz y la tasa de desarrollo al final del ciclo de crecimiento en comparación con la soya. La mejor tolerancia del maíz a la interferencia de las malezas no estuvo relacionada a la emergencia de las plántulas o al crecimiento de S. italica, ya que estos parámetros no variaron con el cultivo anterior. Otros factores biológicos deben estar involucrados en la sinergia entre el guisante y el maíz.

Keywords

Canola, Brassica napus L.corn, Zea mays L.dry pea, Pisum sativum L.foxtail millet, Setaria italica (L.) Beauvsoybean, Glycine max (L.) Merrspring wheat, Triticum aestivum L.Crop diversitycrop sequencecrop tolerance to interferencerotation effect
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 3 , September 2012 , pp. 438 - 442
Copyright
Copyright © Weed Science Society of America 

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