作物生产是一个种群过程

从分析自然选择和人工选择在目标和方向上的重大差异入手，指出自然选择的核心是生存竞争，其结果产生个体优势；人工选择的方向是群体优势，其目标是获得较高的经济产量。作物是典型的人工选择的产物，研究作物的生产过程就庆当以降低个体的竞争能力和提高繁殖分配为主，据此，对小麦植株高度，根系特征以及种群生态学在农业中的应用进行了讨论

CROP PRODUCTION IS A POPULATION PROCESS

As we know, crop production is a colony process. But how to research crop production as a colony process is still unsolved. Through analysing the orientation and results between natural selection and artificial selection, this paper indicated that both selections result in competition for the existence of the natural population, and in improving economic yield of the artificial population, respectively, and orientations of both selections are colony superority for artifical popula tion, and individual superority for natural population. So researches of crop production should be made great efforts on decreaing individual competion ability and increasing reproductive allocation. On the basis mentioned above, this paper also discussed problems on wheat heigh, root system size and application of population ecology in agricultural practices.