【摘要】 研究揭示:固原半干旱旱作农区,农田肥力水平与作物的水分转化效率呈正相关和相关显著,其地力不足导致水分无谓耗损,是生产力水平低下最为直接的原因。采取农田扩种苜蓿,促进畜牧业发展,调整种植业结构,强化农牧结合和实行“有机为基础,有机不足无机补”的拓宽物质循环的原则,建立与资源相适应的具有较高生态效益性能稳定的生产结构体系。强化生态系统物质循环体系,尽可能地提高系统生产力,使生物再生产与社会再生产密切结合,是扩大农业再生产的重要途径。更多还原

【Abstract】 This paper reveals that the conversion efficiency between farmland fertili- ty and crop water requirement appears to be positive correlation and its corre- lation is also very significant in the semiarid rainfed farming area in Guyuan. The poor land fertility results in soil moisture loss,which is the most directive cause for the low level of productivity. Readjustment of structure of plantation of crops to expand the alfalfa plant- ing in farmlands in promotion of livestock development and reinforcement of combination of agriculture with animal husbandry should be carried out,and the principle of opening up the wide material cycle of“taking organic fertilizer as the foundation,in case of shortage of organic fertilizer in supplement of in organic fertilizer”must be implemented.And at the same time the productive structural system with higher ecological benefits and stability in correspondance with resources must be set up so as to reinforce material cycling system in ecological system.Productivity in this system should be raised as quick as possible so as to make biologieal reproduction combine closely with approach in enlargement of agricultural reproduction.更多还原