Tillage and allelopathic aspects of the corn-soybean rotation effect
Anderson, I.C. | Cruse, R.M.
Growth of young corn plants is reduced if their roots grow through a band of corn residue, but if the band is above the seed there is little toxicity. Water extract of residue or of decomposing residue in soil inhibit growth of corn seedlings, but if the extracts are filtered through a column of soil they have little toxicity. Under field conditions these residues have little effect on corn growth. The living roots of corn produce other types of water soluble chemicals which are more persistent in the soil. They are produced during the summer and decompose the following spring. Soybean growing in the field produces three chloroform soluble chemicals that stimulate corn seedling growth. Evidence suggests that corn leaves something in the soil that reduces grain yield of following corn and that soybean leaves something in the soil, in addition to available N, that increases yield of corn.
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