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浙江西部石灰岩母质发育的土壤,由于当地农民长期给稻田施用石灰,致使这些水稻土有着强烈的碳酸钙反应而成为次生石灰性土壤。在这种土壤上生长的水稻,特别是早稻,常发生秧苗发僵现象,产量历年较低。为了揭示该地区水稻发僵低产的原因,我们选择了开化县汶山乡十里铺村,对水稻发僵进行了调查研究和田间试验。结果表明,该地区水稻发僵主要因素系缺锌所致,且证实施用锌肥可消除这种病症并产生显著的增产效果。现将调查试验结果报道如下。
Soil with limestone parental development in western Zhejiang Province, due to long-term application of lime by local farmers to the paddy so that these paddy soil has a strong calcium carbonate reaction and become secondary calcareous soil. Rice grown on this soil, especially in early rice, often experiences stiffening of the seedling, with lower yields over the years. In order to reveal the reason why the rice is deadlocked in the area, we selected Shilipu Village, Munshan Township, Kaihua County to investigate and study the rice stiffness. The results showed that the main factor of rice stiffness in this area was zinc deficiency, and confirmed that the application of zinc fertilizer could eliminate this disease and produce significant yield increase. The survey results are reported below.