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1984年在江西、广西三个地区四种土壤进行田间试验。结果表明,在水稻中存在着对钾素需求不同的品种,即“耐低钾品种”和“需高钾品种”。柳江的团结一号与泰和的754可认为是“耐低钾品种”,特点是吸钾能力强,钾对氮的转化和利用效能高。秧龄适期(42～45)栽插的产量高,秧龄适期栽插的产量高,秧龄短或长的产量低,尤其是后者为明显。秧龄期不适栽插的水稻施用钾肥增产幅度大。适期秧龄的秧苗相对吸收的钾多、氮少,致使秧苗素质好,为高产打下基础。超适期秧龄(65天)施用钾肥,并未改变对氮的吸收,相反增加钾的吸收,到成熟期植株K/N高达3.28,茎秆中缺乏必要的氮量,所以施钾效应不明显。
In 1984 in Jiangxi, Guangxi three areas of four kinds of soil field experiments. The results showed that there are different varieties of rice in the demand for potassium, namely “resistant to low potassium varieties” and “high potassium varieties.” The unity of Liujiang and Taihe 754 can be regarded as “resistant to low potassium varieties,” characterized by strong potassium absorption, potassium conversion and utilization of high nitrogen efficiency. Seedling age suitable (42 ~ 45) planting high yield, seedling age appropriate planting high yield, seedling age short or long output is low, especially the latter is obvious. Rice seedling age unsuitable planting potash application of large yield increase. Suitable seedling age suitable relative absorption of potassium and nitrogen less, resulting in good quality seedlings, lay the foundation for high yield. Potassium application at the super-adaptive seedling age (65 days) did not change the nitrogen uptake, but increased potassium uptake at the maturity stage, with K / N as high as 3.28 and lack of necessary nitrogen in the stem, .