Studies on Establishment of Italian Ryegrass-Rhodes Grass Pasture by Sod-sowing Method : 3. Influence of Soil Compaction on Growth and Yield of Rhodes Grass, Chloris gayana KUNTH

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  • イタリアンライグラスとローズグラスの不耕起連続栽培に関する研究 : 第3報土壌の粗密がローズグラスChloris gayana KUNTHの生育収量に及ぼす影響
  • 土壌の粗密がローズグラスChloris gayana KUNTHの生育収量に及ぼす影響
  • ドジョウ ノ ソミツ ガ ローズグラス Chloris gayana KUNTH ノ セイイク シュウリョウ ニ オヨボス エイキョウ

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Abstract

The aim of this study is to make clear whether the yield of Rhodes grass sown on such a compacted soil condition as shown in our previous paper, decreased or not in comparison with that sown on a loose soil condition. The soil compaction treatments (loose, middle and compact) were conducted on two texture types of volcanic ash soil (silty clay loam and loam) by tractor traffic and Rhodes grass was cultivated. The results obtained are as follows : 1. As soil bulk density increased, the dry matter yield of Rhodes grass also mounted on both soil types. This fact was recognised more clearly in 1st cutting than the others. 2. No significant difference was found in the root distribution within 0-30cm soil depth among the soil compaction treatments. 3. As soil bulk density increased, soil air voids at pF 1.5 in 0-15cm depth decreased, but the measurements of "compact" plot soil were 13-16% on SiCL and 6% on L soil. Air voids in 0-15cm soil depth of "compact" plot were over 10% on both soils throughout all growing period. 4. Available soil moisture percentage per soil volume in 0-15cm depth was higher in "compact" plot than "loose" plot. 5. NO_3-N or NO_3-N+NH_3-N contents per soil volume of "compact" plot was more in surface soil and less in subsurface soil (10-30cm) than "loose" plot. 6. We presumed that the reasons for higher yield of Rhodes grass on more compacted plot were attributed to higher moisture and NO_3-N contents in the surface soil on that plot. 7. Based on the above facts, it can be said that the yield of Rhodes grass sown on such a compacted soil as shown in our previous paper, will not decrease in comparison with that sown on a loose soil.

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