双氰胺对不同质地红壤中尿素的硝化抑制作用研究

Nitrification inhibition of dicyandiamide on urea in the red soil of different textures.

试验研究双氰胺(DCD)对不同质地红壤中尿素的硝化抑制作用影响结果表明,尿素在壤土、粘土中水解快于砂壤土;双氰胺抑制了壤土、粘土中尿素水解的铵硝化作用,但促进了砂壤土中硝化作用。砂壤土中加与未加双氰胺的尿素转化需49d,粘土中未加双氰胺的尿素转化仅需35d,加双氰胺后则延长14d,而壤土中尿素水解产生的铵硝化时间则需进一步研究。

The nitrification inhibition of dicyandiamide on urea in the red soil of different textures was studied. The results show that the hydrolyzation rate of urea in the loam soil and the clay soil is quicker than that in the sandy barn soil,and dieyandiamide slows down the nitrification of urea in the loam .soil and clay soil but improves it in the sandy soil. The transformation of urea in the sandy soil by adding or without adding dicyandiamide needs 49 days. It requires 35 days in the clay while it is prolonged for 14 days after adding dicyandiamide. However the nitrification time of urea in the loam needs further research.