Abstract:Through a combined approach of growth analysis and field micro-climate observations, the variation of the utilization coefficient andtransfer efficiency of solar energy and the relationship between themfor various growth periods of two types of wheat crops are studied.An example of quantitative analysis, using the utilization coefficientof solar energy, of yield effect of cultivation practice is stated andan improvement on the current calculation of solar energy utilizationby wheat crops is presented. The experiment shows that the curveof variation of the utilization coefficient with respect to growingstage exhibits a double-hump distribution with a minimum occurringin the heading stage. For the same economical yield, the utilizationcoefficient of solar energy is larger in South China than in NorthChina. The benefit of using fertilizer is the net result of the com-bined effect of the transfer efficiency of solar energy, reflectanceand vegetative cover on the utilization coefficient of solar energy.