The Joint Effect of Nitrogen Fertilizer and Organic Matter Application on Soybean Yields in Warm Regions of Japan

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

 Effects of application of nitrogen fertilizer and of organic matter on soybean growing in dry fields which were converted from paddy fields were examined.
 1) When organic matter was not applied, the yield-increasing effect of basal or top dressing of nitrogen could hardly be expected. However, when wheat straw or compost was successively applied, the yield-increasing effect of nitrogen applied by basal or top dressing was markedly increased. Particularly, top dressing of 5-10 kg of nitrogen at the flowering stage caused a high rate of yield increase. It seemed to get the yield increase by about 10%.
 2) High positive correlation was observed between grain yields and the total top weight or the total amount of nitrogen absorbed by plants.
 3) Application of nitrogen fertilizer and of organic matter influenced root nodule formation. Application of top dressing of 10 kg nitrogen apparently inhibited the root nodule formation , and 5 t/10 a of compost also inhibited root nodule formation .
 4) Weak negative correlation was observed between the root nodule formation (expressed in weight of nodules) and grain yields. Although the positive application of nitrogen and organic matter tends to inhibit root nodule formation, it was pointed out that the positive applicable of nitrogen and organic matter could be a powerful measure to attain high yields of soybean grains.
 5) Since soil moisture at the flowering stage and pod-setting stage greatly influences grain yields, it was pointed out that the furrow irrigation was useful in preventing the yield decrease when soil moisture was very deficient.

国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 268
終了ページ 276
言語 eng