Studies on Establishment of Italian Ryegrass-Rhodes Grass Pasture by Sod-sowing Method : 4. Influence of Soil Compaction on Growth and Yield of Italian Ryegrass, Lolium multiflorum LAM

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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4報土壌の粗密がイタリアンライグラスLolium multiflorum LAM.の生育収量に及ぼす影響
  • 土壌の粗密がイタリアンライグラスLolium multiflorum LAM.の生育収量に及ぼす影響
  • ドジョウ ノ ソミツ ガ イタリアンライグラス Lolium multiflorum LAM. 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

With a view to making clear the relationship of soil compaction that resulted from sod-sowing method and growth of Italian ryegrass, the soil compaction treatments (loose, middle and compact) were conducted on two texture types of volcanic ash soil (silty loam and loam) by tractor traffic and Italian ryegrass was sown following soil cover. The results obtained are as follows : 1. No significant differences in plant height, number of tiller and dry matter yield of Italian ryegrass were found among the soil compaction treatments on both soil types. 2. The higher soil compaction treatments caused the harder soil, but did not cause significant difference in the root distribution within 0-30cm soil depth. 3. Soil air space at pF 1.5 in the most compacted layer of "compact" plot was 11% on SiL and 6% on L soil, and that at the field was over 10% on both soil types within our measurements. Therefore, it should seem that the soil air reduction by higher soil compaction trearment did not hamper the growth of Italian ryegrass. 4. Available soil moisture percentage per soil volume in 1-6cm depth was higher on more compacted plot, but significant differences in NO_3-N or NO_3-N+NH_3-N contents per soil volume in 1-6cm depth were not found among the treatments. 5. It seems the reason for no significant difference in growth and yield of Italian ryegrass among the treatments, whereas the higher soil compaction treatment caused the higher yield of Rhodes grass as reported in our previous paper, lies in little difference of available nitrogen content in the surface soil (1-6cm), and which resulted from slower nitrification and less leaching of No_3-N into the subsoil under cooler growing season. Anyhow, it has shown that the yield of Italian ryegrass sown on such a compacted soil as shown in previous paper would not decreased in comparison with that sown on a loose soil.

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