硼砂对灰棕紫泥土尿素转化与脲酶活性的影响

采用室内培养,连续取样测定培养期内0%、0.5%、1%、1.5%和2%的硼砂对灰棕紫泥土中尿素、铵态氮、硝态氮和脲酶活性变化的影响。结果表明,硼砂能抑制脲酶活性,进而减缓尿素水解速度与铵态氮释放速度,0.5%的硼砂效果较弱,随硼砂用量的增大,效果增强;硼砂对硝态氮的积累影响不大。由于硼本身就是作物必需营养元素,因此作为尿素缓释剂有着良好的应用前景。

The effect on the urea transformation of gray brown purple mud soil of borax and its urease activity

By indoor culture,the effect of borax on the change of soil urea,NH+4 N,NO-3 N and urease activity at the application rate of 0%,0.5%,1%,1.5% and 2% borax amount.The results showed that borax could inhibit soil urease activity,and then decreased the urea hydrolysis rate and NH+4 N release rate;the increase of borax dosage more than 0.5% could have more significant effect on the hydrolysis rate of urea and NH+4 N release rate;the borax application had little influence on soil nitrate content.Boron is an essential nutrient element for crop,which can be used as urea slow released agent,showing a good application prospect.