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以水稻品种对土壤缺钾症状的反应、对钾肥的敏感性以及对低钾环境适应性能力划分不同等级(五级标准),在室内或田间缺钾条件下评定水稻品种耐低钾水平。通过439份水稻品系鉴定,筛选出34份耐性较强的品种,部份品种在缺钾田(土壤速效钾平均65ppm)上试种,在不施钾或少施钾条件下,比一般当地品种增产10％～15％。经土培和水培研究表明,在低钾环境中,耐性品种比感受品种多吸收钾29％以上,运转到谷粒中钾多10％,钾的有效利用率多7％,耐性品种对钾的利用临界浓度低,吸收利用缓效性钾强,这与品种根系生长的质和量密切相关。尤其后期生长,根系活力强,植株正常生长不早衰。这是耐低钾品种的良好特性。
The rice varieties were evaluated for their ability to respond to potassium deficiency, sensitivity to potash fertilizer and ability to adapt to low potassium environment (Grade 5), and to evaluate the tolerance of rice varieties to potassium deficiency under indoor or field potassium deficiency. A total of 34 cultivars with high tolerance were screened from 439 rice lines. Some cultivars were planted on potassium deficient soil (the average soil available potassium was 65ppm). Under the condition of no potassium or less potassium application, Yield 10% ~ 15%. The results of soil culture and hydroponic culture showed that in the low potassium environment, the tolerant cultivars absorbed more than 29% more potassium, 10% more potassium and 7% more potassium than the susceptible cultivars. The use of low critical concentration, absorption and utilization of slow potassium, which is closely related to the quality and quantity of root growth. In particular, late growth, strong root activity, plant growth is not premature. This is a good trait of low potassium tolerant species.