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早在五十年代,国外水稻栽培中就有湿田缺钾赤枯病的报道,认为发病的主要原因是缺钾,而有机酸、亚铁、硫化氢等等在土壤中的存在,阻碍水稻对钾的吸收,助长了赤枯病的发生。但也有报道,认为湿田赤枯病,不能认为是土壤缺钾,而是由于水稻对铁的过剩吸收,引起呼吸障碍,从而严重阻碍水稻对钾的吸收所致。近年来,国内也有类似报道,认为发生水稻缺钾症的原因是土壤缺钾、排水不良和氮肥过多。一九六四年以来,我们对此类水稻褐斑症就有所接触,并于一九七二年在临安县良种场
As early as the fifties, there were reports of potassium deficiency and blight in wetland in foreign rice cultivation. The main cause of the disease was potassium deficiency. However, the presence of organic acids, ferrous and hydrogen sulfide in the soil hindered rice growth The absorption of potassium, contributed to the occurrence of the blight. However, it has also been reported that dry-wet blight in wetlands can not be considered as potassium deficiency in soils, but rather due to the excess absorption of iron by rice, causing respiratory disorders that seriously hinder the absorption of potassium by rice. In recent years, there are similar reports in China that the reasons for the occurrence of potassium deficiency in rice are soil potassium deficiency, poor drainage and excess nitrogen fertilizer. Since 1964, we have been exposed to this type of brown spot disease and in 1972,