心土破砕機の利用拡張に関する研究 (第12報)
昭和36年度根釧試験地における調査結果 (2)
1963 年 25 巻 3 号 p. 170-174
詳細
1963 年 25 巻 3 号 p. 170-174
This paper reports about the results of the investigation in 1961 in Nemuro-Kushiro district (East Hokkaido). The heading of investigation are physical properties of soil, the growth of crops, and the yields of crops. The lay of the land are the many year's pasture land, the low swampy land, and the eminence. The kind of crops investigated are grasses, potato, dent corn, sugar beet, and oats.
Results are as follows:
(1) In the mechanically treated plots, the soil moisture at the bottom of the loosened soil is constant during a year. On the other hand, the layer of unpercolated water is not settled. At the low swampy land, the unpercolated water tend to drain to the treated plots.
(2) The soil porosity ranges from 70 to 80 percent, and the porosity varies as the moisture content of soil at the plots of over 80 percent in porosity.
(3) Generally, the yields of grasses at the treated plots is high. The height of dentcorn at the treated plots (2.2m) is higher than the corn of untreated plots.
(4) The yield of potato ranges from 901 to 1350kg per 10a. The yield of Potato at the deep treated plots is high. The sugar beet ranges from 0.53 to 1.1 ton per 10a. The T-R ratio ranges from 1.3 to 2.5.
(5) Especially, the growth of sugar beets and potatoes needs the plant protection, because of the controls of insect pests, plant diseases, and weeds are not done in this district.
