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决定籽粒产量的完好的生理学知识对于作物的田间管理措施是完全必要的,这一点越来越加明显.在投资增加或粮价下跌的时候,要想稳定获得满意的利润,就须逐项在每个田间管理环节上谋取最大的收益.在冬小麦生产的所有化学物质的投资中仅肥料一项,就能提高一定的产量,其中,氮肥是最重要的.很明显,掌握时机施氮,可以获取最大利润是完全可以理解并能坚持应用下去的,尽管如此,农民还必须与变化多端的气候条件相抗争.至于其他化学物质,则用以保证
It is increasingly evident that intact physiological knowledge that determines grain yield is necessary for field management of the crop and that in order to stabilize the satisfactory profit as investment increases or grain prices fall, Each field management for the most profitable part of the investment in the production of all chemicals in winter wheat fertilizer alone will be able to increase the yield, of which nitrogen is the most important.Obviously, to grasp the timing of nitrogen can For maximum profit, it is perfectly understandable and can be applied persistently, however, peasants must also contend with the changing climatic conditions. As for other chemical substances, it is used to ensure