A method of water management utilized the subsoiler's holes in upland field converted from paddy
2004
Kitakura, Y. (Fukui-ken. Agricultural Experiment Station (Japan)) | Tsuchida, M. | Sakai, K.
Summary Two problems exist in upland field converted from paddy. They are poor drainage condition and moisture shortage condition for the term of cultivation. Therefore a method of water management utilized the subsoiler's holes was investigated to promote the stable growth of crops (barley and soybean). The results are as follows: 1. Irrigation water is smoothly flowed into the subsoiler's holes through the open ditch in the upland field converted from paddy. 2. In the upland field converted from paddy, the soil moisture content in the area having subsoiler's holes crossed main underdrain at the 1.5m interval was lower than that in the other control area. 3. In the soil layer at the depth of 15cm, the soil moisture content in the area having subsoiler's holes both crossed and paralleled main underdrain was lower and changed sooner than that in area having subsoiler's holes only crossed main underdrain after irrigation. The other side, in the soil layer at the depth of 35cm, the soil moisture content in this area was a little higher than that in the area having subsoiler's holes only crossed main underdrain. 4. The moisture content of the subsoiler's holes paralleled main underdrain was higher than that in the subsoiler's holes crossed main underdrain: -as the subsoiler's holes tended to keep moisture content at the dry term. 5. It was found that the holes of subsoiler both crossed and paralleled main underdrain in the upland field converted from paddy was smoothly able to manage the drainage and irrigation
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