Rice Cultivation by Direct Seeding into Untilled Dry Paddy Stubble

概要

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We hypothesized that direct seeding into the previous year's stubbles in untilled dry rice fields would be a labor-saving rice cultivation method and sought to determine the effectiveness of this method. Three seeding holes (depth, 20 or 40 mm) were bored per stubble, and 4 or 7 seeds were sown in these holes. Four sets of experiments (performed in triplicate) were designed with different combinations of seeding depths and seed numbers. Each experimental plot (2 × 2 m) included 91 stubbles at 150-mm intervals with 300-mm inter-row distances. As a control, 7 seeds were sown in a ditch (depth, 20 mm). Productive panicle number and winnowed paddy yield were determined after harvesting. The experimental results demonstrate the effectiveness of our seeding technique.