| In this paper,the main crop straw in Suzhou District of Jiuquan City,the production situation of rural households,the remaining stock of straw farmers mainly used straw utilization and disposal,straw technology adoption rate,the cognitive level of comprehensive utilization of straw and other aspects of the farmers to carry out a comprehensive investigation,a comprehensive analysis of the current main Suzhou District comprehensive approach taken by in the straw,and deeply summed up in Suzhou District in comprehensive utilization of straw work problems.The experiment was carried out to study the effects of straw decomposition on soil nutrients and the yield of later crops.The amount of straw returning and the amount of decomposing agent were analyzed in the process of corn straw decomposition and returning to field.The main results are summarized as follows:1、very rich straw resources,Suzhou District of Jiuquan City,but the straw utilization rate was 79%,the very traditional.The annual surplus of about 218 thousand and 600 tons of wheat and corn straw resources has not been fully utilized,far from achieving the goal of full quantitative utilization.At present,Suzhou District by using straw returning straw proportion accounted for 7.16% of the sown area of grain crops;use straw decomposition agent for straw returning area accounted for 9.83% of the area,ratio of grain sown area is only 0.71%,less than 1% of the region’s grain sowing area,there are very large promotion space.2、 the application of decomposing agent can accelerate the maturity rate and improve the maturity degree.The application of the combination of straw decomposition agent and straw decomposition agent at the same time point compared to the weight reduction,weight loss rate increased,but the application of the combination of straw decomposition agent at the same time loss was not applying combination of straw decomposition agent weightlessness rate.There was no significant difference in weight loss between the 2 treatments after 10 d and 20 d treatment,and the weight loss rate was significantly different between the 2 treatments at 30 d and 60 d.Straw returned to the field,adding straw decomposition agent can accelerate the maturity of corn straw,effectively improve the maturity of maize straw,than to inoculants can advance 4 ~ 15 d,32 ~ 51 D was corrupt,in advance.Treatment with straw decomposing agent began to decay after treatment with 7-18 d.3、the amount of straw returning and the amount of straw decomposing agent will affect the yield of corn after harvest.In the absence of straw decomposition agent,the straw returning could increase the yield of the succeeding corn,but the increase was not large.Under the same amount of straw returning,the percentage of yield increased by applying straw decomposing agent to straw returning treatment was higher than that of no straw decomposing agent,and the percentage range was 2.08%-9.31%.In combination with 75 kg per hectare per hectare and straw decayed straw 4500 kg,the most significant after crops of corn yield,percentage is 9.31%,and the treatment and other treatment combinations on the yield reached a significant difference.It shows that the combination is the best technology combination of straw decomposition and returning to field.4、 corn straw decomposition and returning technology can increase soil nutrient content.After the corn straw was returned to the field,the soil organic matter content in the test area was increased by 9.05%,the available phosphorus increased by 7.12%,the available potassium increased by 17.52%,the total nitrogen content increased by 16.05%,and the soil pH value decreased by 0.93%.In short,very rich straw resources,Jiuquan Suzhou District,but the straw utilization rate is low,use very traditional,lack of returning maize straw compost.The study found that the amount of maize straw per hectare of 4500 kg,application of 75 kg straw decomposition agent can significantly increase soil nutrients,increase the yield of maize,popularized in Suzhou district. |
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