The improvement of mineral soil by super deep plowing and its influence on the yield

1987年我们在丰桥爱知县设置了三块试验田：1）1.5m超深深试验田; 2）1.0m深试验田; 3）常规试验田，进行了动力贯入试验、静力贯入试验和土壤硬度试验。结果表明，在超深耕和深耕小区中，与常规小区相比，测量值极低。土壤pH值-土壤水分曲线的测定和土壤三相分布的测定表明，深耕使大孔隙率和空气比增加，而固相率降低。这种影响也出现在贯入试验结果上，即在超深耕区，贯入试验值急剧增大。颗粒试验结果表明，与常规小区的多层次相比，1.0m和1.5m深耕小区的颗粒组成在各层中均匀。此外，一致性测试显示，虽然 关于我们 在常规小区中，液限和塑限随深度变化，与粒径分布的分层性相对应，在1.5m深耕小区中，液限和塑限值变化不大，从土壤化学方面来看，深翻处理后，虽然多种有效成分极不均衡，但随着深翻处理时间的延长，随着时间的推移，这在超级深耕情节中尤为显著。在超深耕小区中，多种有效成分在90 ~ 100 cm范围内出现高密度分布格局。1988 - 1989年甘蓝产量试验结果表明，产量的大小顺序为：1）超深耕区-1.5m; 2）深耕区-1m; 3）常规区。由此可见，耕深越深，产量越高。少

In 1987 we set up three experimental fields in Toyohashit Aichi-ken: 1) 1.5 meter super deep ploving plot 2) 1.0 meter deep ploving plot 3) Customary plot and did dynamic penetration test, static penetration test as well as soil hardness test. As a result it is confirmed that in the super deep and deep plowing plot the measurement value vas extremely low compared with the customary plot. Also it became clear from the measurement of pF-soil moisture curve and the measurement of the three phase distribution of soil that macro pore and air ratio increased by deep plowing and solid ration decreased. This influence also appeared on the result of the penetration test i.e. the value increased extremely in the super deep plowing plot deep plowing glot. The result of the particle test showed that in contrast to the multi stratification of the customary plot, the particle component equalized in 1.0 meter and 1.5 meter deep plowing plot in all strata. Also the consistency test revealed that while … More in the customary plot the liquid limit and the plastic limit changed according to the depth and correspond with the stratification of the particle size distributions the change of the value were few in the 1.5 meter deep plowing plot.From the view point of chemical side of soil, though the many type of effective components were extremely unequalized just after the deep plowing treatment it was gradually equalized in accordance with the strata with the lapse of time. This was especially remarkable in the super deep plowing plot. In the super deep plowing plot, high density distribution pattern of many type of effective components appeared somewhere around 90 - 100 centimeter area. Also the illuviation from the result of declination of fine particle of soil could be found.The result of the yield test of cabbage done in 1988 - 1989 showed the yield became bigger in order of 1) super deep plowing plot - 1.5 meter 2) deep plowing plot - 1 meter 3) customary plot From the above it is clear that the deeper the plowing the more yield could be expected. Less