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通过室内恒湿和干湿交替培养试验,研究了钾素受到生物耗竭的耕地棕壤对外源钾的固定特征和施用胡敏酸后对土壤固钾作用的影响。结果表明,在保持土壤处于饱和含水量的恒湿条件下,施用外源钾(K)483. 7mgkg-1,经过一天培养土壤的固钾量和固钾率分别达到265. 8mgkg-1和54. 95%,第3天土壤的固钾量达到最大值,为268. 0mgkg-1,再继续恒湿培养,土壤的固钾量有小幅度降低的趋势。然而,恒湿培养4天以后再经过风干1天,土壤的固钾量呈大幅度升高,固钾率提高30. 31%;在恒湿和干湿交替条件下培养,施用胡敏酸对土壤固钾状况的影响不同:施用胡敏酸不仅没有表现出降低土壤固钾量的作用,反而在第3个干湿交替循环周期结束后提高了土壤的固钾量,但在恒湿条件下施用胡敏酸表现出降低土壤固钾量的作用,与对照之间的差异达到了显著水平。
The experiment was conducted to study the effects of bio-depleted cultivated brown soil on the fixation of exogenous potassium and the effect of humic acid on the fixation of soil potassium by indoor constant-humidity and wet-dry alternation culture. The results showed that under the condition of keeping the soil saturated with moisture, applying exogenous potassium (K) 483.7mgkg-1, the amount of solid potassium and potassium after one day culture reached 265. 8mgkg-1 and 54 95%, the amount of potassium in the soil reached the maximum value of 268. 0mgkg-1 on the third day, and then continued the constant humidity culture, the amount of potassium in soil tended to decrease slightly. However, after 4 days of constant-humidity culture, the soil was solidified with potassium for one day, the potassium content of the soil increased sharply and the potassium-fixing rate increased by 30.31%. The humic acid was applied under the alternation of humidity and humidity Soil potassium fixation had a different effect: application of humic acid not only did not show the effect of reducing the amount of potassium in the soil, but increased the amount of potassium in the soil after the third cycle of wet-dry cycling, but under constant humidity Application of humic acid showed an effect of reducing the amount of potassium in the soil, reaching a significant difference from the control.