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近年来,随着化肥用量的增加,超过一定用量后,每单位重量化肥所能增收的农产品数量有明显下降的现象,其主要原因是各营养元素间施用比例失调。掌握各类田的化肥施用的经济合理比例,对化肥工业的生产和布局、混合肥料的配制、商品化肥的合理流通和使用,以及化肥区划等都具有很大的意义。皖南红壤丘陵地区处我国红壤地带的北缘,属黄红壤亚类。在该红壤类型发育的潴育型黄泥田对三要素要求情况究竟如何?这是急待明确的问题。为此,我们自1981年至1982年连续三茬
In recent years, with the increase of the amount of chemical fertilizer, the amount of agricultural products that can be increased per unit weight of chemical fertilizer has obviously decreased after more than a certain amount. The main reason is the imbalance between the application rates of various nutrient elements. Grasping the economical and reasonable proportions of chemical fertilizers applied to all kinds of fields is of great significance to the production and layout of chemical fertilizer industry, the formulation of compound fertilizers, the rational circulation and use of commercial fertilizers, and the division of chemical fertilizers. Southern Anhui red soil hilly region at the northern margin of China’s red soil region, is a sub-class of yellow-red soil. What is the requirement of the three elements in the type of reservoired yellow clay that develops in this red soil type? This is an urgent problem to be solved. For this reason, we have had three consecutive crops from 1981 to 1982