作施肥计划时要熟悉土壤、作物、肥料的特性,尤其是环境条件如日光、雨水、气温等以及灌溉、排水等农业技术的影响,这对肥料的增产效果有密切关系,是一件不容易的事.合理施肥是综合施肥量、施肥期、施肥法及轮作周期中的分配和配合,只顾一季作物或小面积上大量施肥而使大面积缺肥,纵能增产也是不合理的,如果增产尚不合经济核算也不合理. To be familiar with the characteristics of soils, crops and fertilizers during the fertilization program, especially the effects of agricultural conditions such as sunlight, rain and temperature, and irrigation and drainage, which are closely related to the stimulation effect of fertilizers, it is not easy Of the rational fertilization is the amount of fertilizer, fertilization, fertilization and rotation cycle distribution and cooperation, just a quarter of crops or a large area of ​​fertilizer on a large area so that lack of fertilizer, can only increase production is unreasonable, if the increase Not suitable for economic accounting is not reasonable.