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锌是农作物生长发育的一种重要微量元素。由于近年来氮、磷等化肥施用量的逐年增加,以及单位面积产量不断提高,就产生了土壤中微量元素的含量逐渐减少,成为一些地区继续增产的一个限制因素。使玉米、水稻等作物出现了缺锌症状,产量及品质受到了一定影响。为了探索锌肥对作物的增产效果,本所从1978年开始在全省布置了作物对锌肥(硫酸锌下同)的肥效试验网点。通过1978～1980年的试验,初步明确了锌肥在玉米上的增产效果、有效施用量与施用方法,为我省玉米施用锌肥提供了依据。一、试验设计与处理(一)锌肥不同施用量的设计处理
Zinc is an important trace element of crop growth and development. In recent years, nitrogen and phosphorus fertilizers, such as increasing the amount of application and the continuous increase of yield per unit area, resulting in the soil trace elements gradually reduced, as some areas continue to increase production of a limiting factor. So that corn, rice and other crops appeared zinc deficiency symptoms, yield and quality have been affected. In order to explore the yield-increasing effect of zinc fertilizer on crops, the institute has arranged fertilizer efficiency test sites for zinc fertilizer (zinc sulfate) in the province since 1978. Through the experiment from 1978 to 1980, the yield-increasing effect of zinc fertilizer on corn, the effective application rate and the application method were clarified, which provided the basis for the application of zinc fertilizer in maize in our province. First, the experimental design and treatment (A) zinc fertilizer application rate of different design and processing