The nitrate content of a soil has been determir.ed befcre and after plowing under of a legume crcp and also during tre growth of the succeeding wheat crop, Nitrate content of the soil as considerably higher in the green manured plot, but wheat yield is not increased by green manuring.Fcur hypotheses on the failure of green manure to increase wheat yield are examined and discussed.
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叶和才,刘含莉.绿肥对于麦田硝酸氮含量之影响[J].土壤学报,1948,0(1):29-32. Yieh, Ho-tsai. EFFECT OF PLOWING UNDER OF A LEGUMINOUS GREEN MANURE ON THE NITRATE CONTENT OF A SOIL[J]. Acta Pedologica Sinica,1948,0(1):29-32.