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用物质积累与分配观点来研究产量的形成规律时,经济产量(y)可表达为生物学产量(w)与经济系数(C)的乘积,即y=C·W(1)。关于W的积累特征和时空变化规律本研究的第一部分已有报道。由于经济产量是在齐穗后才逐步形成,不同发育期的物质形成对经济产量又具有不等价性,因而C值的大小实质上是在物质积累过程中由干物质的分配比例所决定的。对实测资料的统计表明,我国南方稻区杂交籼稻(汕优6号)的经济系数平均为0.4435,但变异很大,变异系数为27.36％,高值可达0.6409(丽水1065米、早季稻),最低仅为
The economic output (y) can be expressed as the product of the biological output (w) and the economic coefficient (c), ie y = C · W (1), when studying the law of the formation of yield from the perspective of material accumulation and distribution. The first part of this study has been reported on the accumulation characteristics and temporal and spatial variation of W. Since the economic output is gradually formed after the full heading, the material formation at different developmental stages is unequal to the economic output, so the value of C is essentially determined by the proportion of dry matter in the process of material accumulation . The statistics of measured data show that the average economic coefficient of hybrid indica rice (Shanyou 6) in southern China is 0.4435, but the variation is very large with a coefficient of variation of 27.36% and a high value of 0.6409 (1065 m in Lishui, ), The lowest only