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Sparse planting is one of effective methods for reduction in labor of raising of seedling and seedling transportation that occupy a large part of paddy rice work.In early season culture, we investigated the effects of enlargement hill distance on growth and yield of paddy rice culture in the case of the row distance of 30cm. The results are as follows.1) In every transplantation time, there was a tendency that enlargement hill distance increased the number of panicles per hill and decreased the number of panicles per unit area.2) Enlargement hill distance increased the panicle length and the number of rough rice per panicle. As a result, there was no difference in the number of rough rice per unit area and yield, although the hill distance was enlarged from 15cm to 38cm in the transplantation in the third ten days of April, and from 15cm to 30cm in the second ten days of May and the first ten days of June.3) In order to obtain the sufficient and stable yield, it was necessary that the panicle number per square meter was over 290 and the stem number per square meter was over 310 in maximum tiller number stage.4) These results lead to conclusion that it was able to reduce 50% or more of the amount of nursery, if the seedling transplantation was done earlier than the beginning of June. From this view point one way soy that Enlargement Hill Distance is extremely useful to reduce the raising of seedling and the seedling transportation labor.

nousagyou kenkyuu/nōsagyō kenkyū

Effects of Enlargement of Hill Distance on Growth and Yield of Early Season Cultured Rice-Sparse Planting for Reduction in labor of Raising of Seedling and Seedling Transportation in Rice-