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导言 本试验设计的目的是:①探讨使用肥料的作用与施肥前土壤肥力之间的关系;②根据在氮、磷肥力不同的土壤中施用肥料对玉米产量的影响,将土壤按肥力分成不同的等级。在此,必须看到的事实是:各种土壤,其“肥力”和“生产力”的差别是很大的。因此,应从获得的产量来考虑施肥的数量。乌里约和辛格(1978)对在相同农业小气侯条件下不同土壤中使用相同数量的肥料产生的各种变化进行了观察。
Introduction The purpose of this trial design was to: (1) investigate the relationship between the use of fertilizers and soil fertility before fertilization; (2) divide the soil into different fertilizers according to the effect of applying fertilizers on the yield of maize in soils with different nitrogen and phosphorus fertilizers grade. Here, we must see the fact that the difference between “fertility” and “productivity” of various soils is great. Therefore, the amount of fertilization should be taken into account from the yield obtained. Urij and Singh (1978) observed the various changes produced by using the same amount of fertilizer in different soils under the same agroclimatic conditions.