木质素磺酸盐对尿素氮转化与蔬菜硝酸盐积累的影响

Effect of Lignosulfonates on Controlling of Urea Nitrogen Transformation and Nitrate Accumulation in Vegetable

通过室内培养与小区蔬菜试验 ,研究了添加木质素磺酸盐对土壤中尿素氮转化的影响以及对蔬菜硝酸盐污染的控制机理 .结果表明 ,经过 6 9h土壤培养 ,与对照比较 ,木质素磺酸盐对土壤中尿素水解有较好的抑制作用 ,土壤中残留尿素态氮含量高于脲酶抑制剂氢醌处理 .木质素磺酸盐不仅能降低小区小白菜的硝酸盐含量 ,而且还可提高维生素C含量 ,并能提高蔬菜植株体内硝酸还原酶活性 ,加速N的同化 ,收获后土壤中脲酶活性较低 ,NH+4 N仍较高 ,说明木质素对土壤氮素转化有较好的稳定作用与保肥效果 .因此 ,木质素磺酸盐可作为化肥氮素转化抑制剂在控释肥料中应用 .

Indoor cultivation experiment and plot field experiment were conducted to study the effect of lignosulfonates on urea nitrogen transformation in soil and the mechanism of controlling nitrate pollution in vegetable. Results showed that lignosulfonates behaved inhibition effect on urea hydrolysis compared with the contrast treatment, the contents of remainder urea nitrogen treated with lignosulfonates was more than that of another kind of urease inhibitor hydroquinone in soil after 69 hours cultivation. Lignosulfonates could reduce contents of nitrate in cabbage, it as well increase contents of vitamin C in a large degree, enhance the nitrate reductase activity, then accelerated nitrogen assimilation in plants. The urease activity was lower and contents of ammonium nitrogen in soil was larger after ingathering, lignosulfonates could keep nitrogen release slowly, and could be used as a kind of effective inhibitor to nitrogen fertilizer in the controlled-release fertilizers.