Studies on the Non-preparation Sowing of Italian Ryegrass on Paddy Field in Snowy Region : Liming before Rice Planting and Sowing Germinant Seed of Italian Ryegrass

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  • 積雪地帯における水田裏作イタリアンライグラスの不耕起栽培に関する研究 : 水稲作付前の石灰施用とイタリアンライグラスの催芽播
  • セキセツ チタイ ニ オケル スイデン ウラサク イタリアンライグラス ノ フコウキサイバイ ニ カンスル ケンキュウ スイトウ サクツケ マエ ノ セッカイシヨウ ト イタリアンライグラス ノ サイガハン

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Lime was applied before rice planting and seed of Italian ryegrass was sown on non-plowed soil in paddy field after rice harvesting. This experiment was carried out in 1963-'64 and the results obtaind were as follows : 1. Liming before rice planting did not increase soil pH as high as we expected, but brought 0.5-1.0 higher pH values than that of unliming in winter crop season. It was effective to produce remarkable high yields of Italian ryegrass. The increase of Italian ryegrass must be due to the secondary factors that liming make the soil nutritious substance more available by raising pH level. 2. Liming before rice planting did not result in lower yields but tended to produce some higher yields of rice. 3. Better germination, stands and higher plant height were obtained in sowing germinant seed than in sowing non-germinant seed of Italian ryegrass. The differences of plant height in both treatments was kept up till after passing the winter. Sowing germinant seed produced higher yields than sowing non-germinant seed, because the former had more main stems than the latter, in addition to above-mentioned matters. Interaction was recognized between sowing of germinant seed and nitrogenous level. 4. By natural soil packing, rate of gaseous phase in plowed soil became almost equal to that of non-plowed soil after passing the winter. It seemed, therefore, non-plowed soil did not give particular harm for growth of Italian ryegrass.

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