Effects of Different Seeding Patterns on the Yield of Rice Directly Sown in a Well-drained Paddy Field Using Plowing and Compaction

抄録

This study aimed to experimentally determine the effectiveness of hill seeding in a well-drained paddy field using plowing and compaction systems by comparing the yield, quality, and lodging resistance under high-fertilizer conditions, to those of direct sowing in rows. The degree of lodging was found to be higher with hill seeding than with row sowing. There was a significant reduction in yield with row seeding. This was related to the lower percentage of ripened grain on the primary and secondary rachis branches of the panicle. Therefore, under high-fertilizer conditions, which promote lodging in rice directly sown in a well-drained paddy field using plowing and compaction systems, hill seeding has superior lodging resistance. This was due to the presence of shorter and thicker lower internodes in hill seeding compared to row seeding. Ripening capability was also maintained, which resulted in a higher yield and improved quality. Therefore, hill seeding is effective in obtaining stable and high yields of rice directly sown in well-drained paddy fields using plowing and compaction systems and of rice directly sown in flooded paddy fields.