寒地玉米秸秆生物腐熟后断裂拉力值和减重值的变化

Changes of Breaking Tension Value and Weight Loss Value of Thoroughly Decomposed Corn Stalk in Cold Region

为促进秸秆综合利用,采用自主研发的秸秆腐熟剂研究其在玉米秸秆直接还田上的应用效果,在黑龙江省绥化市兰西县用网袋法进行了为期60 d的田间试验,设空白对照(秸秆直接还田)、尿素+秸秆、腐熟剂+秸秆和腐熟剂+尿素+秸秆共4个处理,观察测定还田后玉米秸秆的颜色、拉力和减重率变化。结果表明:随着时间的延长和腐解程度的加深,各处理秸秆的颜色逐渐变深、拉力逐渐变小、减重率逐渐增加;第10天达到67℃;秸秆减重率在60 d达到65.27%;秸秆拉力值在60 d时拉力值知道达到16.23 N,拉力值较使用前降低了89.43%。效果最好的是腐熟剂+尿素处理,可使秸秆腐解速度加快20 d以上。

In order to promote the comprehensive utilization of straw,the application effect of self-developed straw decomposition agent on corn straw direct returning to field was studied.In the field experiment,blank control(straw returning directly),(urea+straw),(composting agent+straw)and(composting agent+urea+straw)were set up to observe and determine the color,tensile force and weight loss rate of corn straw after returning to the field.The results showed that with the extension of time and the deepening of decomposition degree,the color of straw gradually darkened,the tensile force gradually decreased,and the weight loss rate gradually increased,it reached 67℃on the 10th day;the weight loss rate of straw reached 65.27%in 60 d;the tensile value of straw reached 16.23 N at 60 d,which decreased 89.43%compared with before.In conclusion,the decomposition rate of straw could be accelerated by more than 20 days by the treatment of decomposition agent+urea.