Effect of Timing of Tilling after Application of Lime Nitrogen on Emergence and Seedling Establishment of Volunteer Rice (<i>Oryza sativa</i> L.)

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  • 石灰窒素散布後の耕起時期が漏生イネの出芽・苗立ちに及ぼす影響
  • セッカイ チッソ サンプ ゴ ノ コウキジキ ガ ロウセイ イネ ノ シュツガ ・ ナエ タチ ニ オヨボス エイキョウ

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<p>Lime nitrogen (LN) suppresses the emergence of volunteer rice originating from high-yielding rice cultivars. However, the appropriate technique or environmental condition for utilizing LN remains unclear. In this study, we examined the effect of the timing of tilling after the application of LN considering the meteorological factors. In a pot experiment, rice emergence decreased as the duration from LN application to the mixing of seeds and soil increased, from 3 to 20 days under appropriate water conditions. Immediate mixing of seeds and soil after LN application did not decrease emergence, and continuous drying conditions before and after LN application rarely suppressed emergence. In field experiments, we created a pseudo rough rice dropping condition by broadcasting the seeds after removing rice straw from the paddy field. Immediate tilling after LN application did not suppress the seedling establishment of volunteer rice. Our results suggest that the duration from LN application to tilling should be at least two weeks under an average temperature of 11 to 15ºC and appropriate soil water conditions. Even in the presence of rice straw residue, the percentage of germination after wintering declined when seeds were buried in the soil for a certain period after LN application. However, the suppressive effect of LN might be less than half of that in the absence of rice straw.</p>

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