Practicability of Corn Cultivation under Partial Tillage with Slurry as Topdressing

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  • 前作収穫跡におけるスラリーを追肥利用するトウモロコシ部分耕栽培
  • ゼン サク シュウカク アト ニ オケル スラリー オ ツイヒ リヨウ スル トウモロコシ ブブンコウサイバイ

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We evaluated the method of corn cultivation with partial tillage and farm waste slurry spread as topdressing. Partial tillage plots were made by combining treatments of sowing time, preceding crop species, and herbicide application. We compared the yields of crops in partial tillage plots, in which there were varying amounts of standing dead plant matter derived from the preceding crops, with those of plots with conventional tillage and topdressing compound fertilizer. Higher corn yield in partial tillage plots was obtained by seeding in May than April, by seeding after oats than Italian ryegrass, and by herbicide application. There was a significant, negative correlation between corn yield and amount of standing dead plant matter from the preceding crop. Althogh corn yield decreased to 34% compared with the control plot by trampling of the wheels of the vacuum tanker used for spreading the slurry, adherent slurry harmed only a small portion of the corn plant. These results suggest that corn cultivation under partial tillage could be improved by choosing the preceding crop species, optimizing planting time, and earlier applying herbicide to decrease regrowth of the preceding crop. This cultivation seems practical under conditions in Kyushu district.

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