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青浦的淀泖洼地,土质粘重,青紫泥多,种植早稻常因前期发不起而影响产量。据市农科院土肥所调查,该土壤中锌含量较少,常导致水稻植株矮小,分蘖延迟。1978～1980三年小区试验,证实在这类土壤上合理施用锌肥,可以使早稻获得较好的增产效果。 (一)不同时期喷锌效果:早稻于拔秧前5天开始喷硫酸锌,以后第隔10～15天处理一次,使用浓度均为0.1％,直至收割,每个处理重复三次。试验结果,大田各期喷锌都有一定效果,增产8.6～115.3斤.扬花灌浆期喷锌效果最好,增产14.21％,
Qingpu Lake depression, soil sticky weight, purple mud and more, often because of the early planting can not afford to affect the yield of early rice. According to the survey by the Municipal Academy of Agricultural Sciences soil fertilizers, the soil less zinc content, often lead to short plants in rice, tiller delay. From 1978 to 1980, three years of plots experiments confirmed that the reasonable application of zinc fertilizer on such soils can make the early rice get a better yield increase effect. (1) Zinc spraying in different periods: Zinc sulphate was sprayed on early rice 5 days prior to rice transplanting. Afterwards, it was treated once every 10 to 15 days with concentrations of 0.1% until harvesting, and each treatment was repeated three times. The results showed that spraying zinc had a certain effect in all stages of the field, increasing yield by 8.6-115.3 kg, spraying zinc at flowering stage was the best, yielding 14.21%