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试验采用二次回归正交旋转组合设计,研究了硫酸钾、氯化铵、过磷酸钙和氧化镁对苜蓿阴阳离子平衡(CAB)的影响。结果表明,苜蓿株体中K+含量最高,变化范围为2.40%～4.01%,其次为Cl-、S2-,变化范围分别为0.84%～1.09%和0.35%～0.58%,Na+的含量最低,其变化范围为0.09%～0.22%;CAB值范围为155～501mEq/kg DM。对苜蓿CAB值有显著影响的因子为硫酸钾和氧化镁,二者和苜蓿CAB值间存在显著的负效应;氯化铵和过磷酸钙单因子对苜蓿CAB值影响不显著,但氯化铵与过磷酸钙、氯化铵与氧化镁之间的交互作用可以显著影响苜蓿CAB值。单施一种肥料可使苜蓿CAB值最低降到216.55mEq/kg DM,效果不显著,而组合施用可降到80.55mEq/kg DM。在本试验条件下,苜蓿CAB值最低的施肥组合为:硫酸钾50kg/hm2,氯化铵275kg/hm2,过磷酸钙1 000kg/hm2,氧化镁55kg/hm2。
The quadratic regression orthogonal rotation combination design was used to study the effects of potassium sulfate, ammonium chloride, superphosphate and magnesium oxide on the anion-cation balance (CAB) of alfalfa. The results showed that the content of K + in alfalfa plants was the highest, ranging from 2.40% to 4.01%, followed by Cl- and S2-, with the range of 0.84% -1.09% and 0.35% -0.58%, respectively. The content of Na + The range of variation was 0.09% -0.22%; the CAB value ranged from 155 ~ 501mEq / kg DM. The factors affecting the CAB value of alfalfa significantly were potassium sulphate and magnesia. There was a significant negative effect between CAB value and the CAB value of alfalfa. Ammonium chloride and superphosphate had no significant effect on CAB value of alfalfa, but ammonium chloride Interaction with superphosphate, ammonium chloride and magnesia can significantly affect alfalfa CAB values. Under the sole application of a kind of fertilizer, the CAB value of alfalfa dropped to 216.55mEq / kg DM with no significant effect, but the combined application could be reduced to 80.55mEq / kg DM. Under the experimental conditions, the lowest CAB value for alfalfa was as follows: 50kg / hm2 of potassium sulfate, 275kg / hm2 of ammonium chloride, 1000kg / hm2 of superphosphate and 55kg / hm2 of magnesia.