施用长效缓释尿素对大豆根腐病及产量的影响

为了探明长效缓释尿素是否对大豆根腐病病情指数有影响，其影响是否是导致产量降低的主要因素，试验于2014 年在大豆鼓粒期采用通径分析的方法对根部主要生理指标、大豆根腐病病情指数与产量之间的关系进行了通径分析。结果表明：施用长效缓释尿素的处理病情指数最低，达到33.96%，其产量最高为2998.65 kg/hm2。在对影响大豆产量的根部参数的通径分析中可以看出，直接通径系数最大的为地下鲜重的0.4649，说明其为最关键因子。根腐病病情指数也是影响大豆产量的因素之一，但其不是最主要的因素。长效缓释尿素主要是通过增加地下鲜重从而影响产量。

Effect of Application of Sustained Release Urea on Root Rot and Yield of Soybean

The study aims to find out whether the sustained release urea has certain effects on the disease index of soybean root rot, and whether the effect could be the main factor of the yield decrease. The relationship between the main physiological index of soybean and soybean root rot disease index and yield of soybean was analyzed by using path analysis in 2014. The results showed that the disease index of treatment of long-term sustained release urea was the lowest, which was 33.96% , but its yield was 2998.65 kg/hm2. In the path analysis of the root parameters affecting the yield of soybean, we could see the direct path coefficient was 0.4649, which was the most important factor for underground fresh weight. The disease index of root rot was one of the factors that affect soybean production, but it was not the main factor. The effect of sustained release urea on the yield was mainly through the increase of underground fresh weight.