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180 多个田间对比试验和30多个小区试验结果表明,施钾可增加小麦产量。土壤类型不同, 其施钾效应不同, 增产效应依次为: 黄壤> 潮土> 紫色土。同一土类不同土属施钾效应有差异, 紫色土类棕紫泥上施钾效应不显著。氮肥水平高低直接影响小麦施钾效应, 随着氮肥用量的增加, 小麦对钾的需求愈迫切, 施钾边际效应增加。高氮施钾增产效应和经济效益好于低氮施钾效应。土壤速效钾和缓效钾测定值与小麦相对产量相关性达极显著水平, 可以作为衡量土壤供钾丰缺指标。在供钾水平为极低、低、中、高、极高的土壤上小麦施钾效果分别表现为极显著、显著、有效、一般有效和不明显。当土壤速效钾< 40ppm , 或缓效钾< 100ppm , 小麦施钾效果最好; 当土壤速效钾> 120ppm , 或缓效钾> 550ppm , 施钾效应不显著。农肥可补充土壤供钾不足。
More than 180 field trials and more than 30 plots showed that applying potassium could increase wheat yield. Different types of soil, the effect of different potassium, yield-increasing effect were: yellow soil> Chao soil> purple soil. Potassium effect was different in different soil types in the same soil. Potassium effect was not significant on purple soil purple brown soil. The level of nitrogen fertilizer directly affects the effect of potassium application in wheat. With the increase of nitrogen application rate, the demand of potassium for wheat is more urgent and the marginal effect of potassium application is increased. High potassium fertilizer yield and economic benefit is better than low potassium fertilizer. Soil available potassium and slow-available potassium measured values and the relative yield of wheat reached a significant level, can be used as a measure of soil potassium deficiency indicators. The results showed that potassium fertilization in wheat with extremely low, medium, high and high potassium levels showed extremely significant, significant, effective, generally effective and insignificant effects. When soil available K <40ppm, or slow-acting K <100ppm, potassium was the best in wheat. When soil available potassium> 120ppm, or slow-acting potassium> 550ppm, potassium application was insignificant. Fertilizer can supplement the soil for potassium deficiency.