The soil improvement and plant growth on the newly-reclaimed sloped land., 2; Effects of soil improvement on the changes of soil physical properties and silage corn growth
1989
Hur, B.K. | Jo, I.S. | Um, K.T. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Inst.) | Kim, M.S. (Kyunghee Univ., Suwon (Korea R.). Coll. of Industry)
This experiment was conducted to find out the effect of soil improvement on the changes of soil physical properties and the silage yield of corn in the newly-reclaimed sloped land. Corn (Suwon 19) was cultivated under the six different treatments at Songjeong loam, 20 percent slope, during 1985 to 1987 and various soil physical properties and silage yield were investigated. Growing degree days of corn during the growing season were 820.6deg C in 1985, 810.2deg C in 1986, and 812.4deg C in 1987. The changes of soil bulk density were high variances by different treatments in 1st year, but sluggish in 2nd year. In 3rd year, the control plot was the highest, but the integrated improvement plot was the lowest than the other plots. Soil hardness was reduced in subsoiling and integrated improvement plot with deep plowing, and water stable aggregates and air permeability were higher in these plots. Moisture retention was no differences between treatments. Dry matter yield of corn was decreased in the 2nd year than the 1st year, but increased in the 3rd year. Increasing ratio of yield was in the order of integrated improvement subsoiling lime phosphate compost control plot. Correlation among the dry matter yield and soil physical properties were significant at 1 %, but moisture retention of soil was not significant at 5 %
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