【摘要】 八十年代以来,陕西省的农业土壤开始出现了缺钾症状,施用钾肥有着明显的效果。以陕南汉中盆地的白塔土、关中的砂土及陕北的滩地砂土施钾效果最好、小麦盆栽试验结果增产30-40%,汉中盆地的田间试验结果,施钾有效率约60%,水稻平均增产14.8%,小麦增产16.5%。本研究提出用硝酸溶钾作为土壤供钾能力指标,它比用速效钾作指标数据准确可靠,比用缓效钾单因子或缓效钾和速效钾双因子作指标方法简便易行,可预测施钾效果。更多还原

【Abstract】 The efficiency of potassium fertilizer on 21 different kinds of agricultural soil Shaanxi Province was investigated with pot experiment from 1979 to 1982. T efficiency of potassium fertilizer was very variable among different soils. The highe（?） response of crops to the potassium fertilizer was obtained from the Beithan soil （paddy soil） and yellow cinnamon soil （paddy soil） in Hanzhong Basin and the sandy soil in central and northern parts of Shaanxi Province. The yield of wheat was increased by 30-40% with the application of potassium fertilizer. The lowest efficiency of potassium fertilizer was found on the manured loessal soil and dark loessal soil in the central part of Shaanxi province. The results of field experiment in Hanzhong Basin showed that the response of crops to potassium fertilizer was very high. The average of yield in crease in wheat and rice was 16.5% and 14.8% respectively.The correlation between plant response to K and extractable K was greater for nitric-acid-soluble K and slowly available K than for available K extracted by 1N NH₄AC. It is better to use the nitric-acid-soluble K as the index of supplying capacity of soil K than to use the available K and the slowly available K. The index of nitricacid-soluble K can predict the efficiency of the potassium fertilizer applied.更多还原