This study was made to investigate the effects of pan-breaking on soil condition in the temperate regions, 3 plots were prepared for this study in Shinden-bara, Fukuoka prefecture. These plots were provided with different conditions each other. Namely, field A has been penetrated by single standard pan-breaker at the mean depth of 43cm, and the mean distance between each pan-breaking was 206cm. Field-A was classified into 2 plots. One of them is A-A where subsoil has been oosened, the another is A-A′ the intermediate strips between the traces of penetration, where subsoil has not been loosened. Field-B is control plot.
In these plots, the physical properties of soil were investigated just before and after the pan-breaking, and about eight months later, too. Moreover, a winter, wheat variety, Norin-61, was grown in these 3 plots, applying ordinary cultivation practice in this district, and the effect of pan-breaking upon growth and yield of this crop was examined. The results were as follows;
1. It is clearly pointed out that the pan-breaking is very promising in getting good crops, showing increases of about 20% in plant height and 36% in yield when these are compared with cropping in B plot.
2. However, A-A plot shows better cropping than A-A′ plot.
3. Therefore, it is necessary to study the reasonable method of pan-breaking and improvement of pan-breaker which may be able to loose subsoil uniformly.
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