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在区域农业的氮平衡研究中,大范围估计豆科作物的共生固氮量,是必需进行的。以往采取按豆科作物种类设定单位面积共生固氮量而不考虑作物本身生长好坏,势必给这一估算带来很大误差。豆科作物共生固氮量的田间测定,迄今尚无完善的方法。用同位素~(15)N 稀释法或 A 值法测定豆科作物共生固氮量,常用不结瘤的豆科作物品系或非豆科作物作为参比作物以区别来自大气、土壤和肥科中的氮量。由于豆科作物与参比作物对肥料氮的利用能力不相同,因而往
In the study of nitrogen balance in regional agriculture, it is necessary to conduct a large-scale estimation of symbiotic nitrogen fixation of leguminous crops. In the past, if we set the symbiotic nitrogen fixation per unit area according to the type of leguminous crops without regard to the quality of the crops themselves, it is bound to bring great errors to this estimation. Field determination of symbiotic nitrogen fixation of leguminous crops has so far not been well established. Isotopes (15) N dilution method or A value method was used to determine the symbiotic nitrogen fixation of leguminous crops. Common non-nodulated leguminous crops or non-leguminous crops were used as reference crops to distinguish between atmospheric, soil and fertile Of nitrogen. Since leguminous crops and reference crops have different abilities to utilize nitrogen fertilizer,