Effect of cultural control on the yield of corn sown by partial tillage seeder into an Italian ryegrass sward in April
2004
Kobayashi, R. (National Inst. of Livestock and Grassland Science, Tsukuba, Ibaraki (Japan)) | Tateno, K. | Sato, S.
With a partial tillage seeder that we invented, we planted corn into an Italian ryegrass sward after the first harvest in April, and examined the effect of fertilizer rate and cutting of ryegrass regrowth on corn yield. Since ryegrass regrowth was remarkable in the plot where hebicide was not sprayed regardless of the rate of fertilizer applied to the corn, the early growth of the corn was delayed by shading. Consequently, the yield was much less than the plot where herbicide was sprayed. Cutting the ryegrass was not effective either : the corn yield in the plot where ryegrass was cut 3 times was below 50% of the yield of the control plot, which was sown by conventional tillage. These results indicate that improvement of yield of corn sown by the machine requires that Italian ryegrass be depressed by inter-row cultivation or foliar application of herbicide.
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