剑麻麻茎还田及配施不同水平氮肥对土壤肥力和剑麻生长的影响

为合理利用剑麻麻茎作有机肥还田,采用盆栽试验研究了麻茎单独还田及配施不同用量氮肥对土壤理化性质和剑麻生长的影响。结果表明,单加麻茎处理土壤有机质含量、碱解氮含量和土壤脲酶活性与空白对照相比均显著提高,增幅分别达180.0%、46.8%、109.7%。麻茎配施不同水平尿素也明显提高土壤有机质含量、碱解氮含量和土壤脲酶活性。麻茎配施1/2用量尿素可显著提高土壤转化酶活性。麻茎配施1/4用量尿素明显提高剑麻叶长,分别比空白对照、单施尿素和单施麻茎处理提高60.9%、25.0%、22.5%。添加麻茎可以在一定程度上取代尿素的施用,在添加麻茎的情况下,不需要施用全量化肥。

Effects of Sisal Stalks Returned to the Field with Nitrogen Fertilizer on the Soil Fertility and Sisal Growth

In order to return the sisal stalks properly as the organic fertilizer, a pot experiment was carried out to study on the effects of sisal stalks returned to soil with nitrogen fertilizer application on the soil fertility and sisal growth. The results showed that the soil organic matter content, alkali hydrolysable nitrogen content and the soil urease activity were significantly higher than that in the controls, increased by 180.0%, 46.8% and 109.7%, respectively. And the three indicators also increased significantly when using the sisal stalks combined with different amount of urea. Soil invertase activity was significantly higher thanthat in the controls by using the sisal stalks combined with 1/2 amount of urea. Sisal leaf length after sisal stalks returned to the soil with 1/4 amount of urea was significantly higher than that in the control, the single application of urea and the single application of sisal stalks by 60.9%, 25.0% and 22.5%, respectively. Sisal stalks could replace some urea, and it needn’t use the full dose of urea when sisal stalks were returned to the field.