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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。
Since the 1980s, the agricultural soil in Shaanxi Province began to have the symptoms of potassium deficiency. The application of potassium fertilizer has obvious effects. The results showed that potassium was best applied to the Baita soil in the Hanzhong Basin, Guanzhong soil and sandy land in the northern Shaanxi Province. The pot experiment results of wheat increased 30-40%, and the field experiment results in Hanzhong Basin showed that the potassium application efficiency was about 60 %, Rice average yield 14.8%, wheat yield 16.5%. This study proposed the use of potassium nitrate as an indicator of soil potassium supply, which is more accurate and reliable than the use of quick-acting potassium. Compared with the single factor of slow-acting potassium or the slow-acting potassium and quick-acting potassium, the two methods are simple and predictable Potassium effect.