Studies on the relation of changes of soil moisture to crop growth on the field used after the forage crop cultivation (Preliminary report)

Abstract

This experiment was carried out from June to ctober, 1952. Concerning the soil moisture, we examined its effects on the growth and yield of corn in field used after the foragd crop cultivation. After two years uniform cultivation we set up the followlng plots. A. Soybean...wheat...corn plus lespedeza. B. Soybean...wheat...corn. C. Soybean...wheat..forage crop (rye grass plus vetch)...corn. 1) The germination percentage of corn and the early stage of growth in the "C" plot was most inferior to others. This seemed to be caused by the fact that the moisture of surface soil was less than others. 2) The moisture contents at 20 cm deep in the "C" plot was more than others, and the latter stage of the growth of corn was superior to others. 3) The root-hair of the corn at the surface soil in the "A" plot was most prosperous, which followed by "C" plot. 4) The yield of corn in the "C" plot was heaviest.