摘要
通过在贵州喀斯特地区测定15个试点135个油菜田块的土壤指标,发现土壤8种指标在各试点和不同田块存在显著或极显著差异。土壤全钙与交换钙含量之间达极显著相关,土壤全钙与交换镁含量相关性较大,土壤交换钙与交换镁含量间也达极显著相关。同时,调查各试点各田块油菜不同生育期菌核病病情,发现土壤因素对油菜各生育时期菌核病发生有显著影响。土壤全钙含量和p H对于初花期油菜叶部发病率和盛花期茎部发病率、病情指数的发生起主要作用,土壤有效磷和碱解氮对盛花期叶部发病率起主要作用,土壤p H对终花期茎部发病率和病情指数起主要作用;土壤中高含量有效磷和速效钾是促进成熟期茎部菌核病发病率和病情指数的主要因素。
Through 135 representative samples form 15 test points, there was significantly correlation between 8 soil indexes. There were significantly correlated between contents of soil total calcium and soil exchangeable calcium and magnesium, the same as soil exchangeable calcium and soil exchangeable magnesium. As one of the major factors, soil had critical impact on rape sclerotiniose disease in rapeseed growth. The results of stepwise regression analysis showed that p H value and soil contents of total calcium, available potassium, and exchangeable calcium were key factors affecting leaf disease in initial flowering stage. Soil contents of Alkeline-N and available phosphorus were key factors affecting leaf disease in blooming period, p H value and the soil contents of total calcium were key factors affecting stem disease and disease index. The p H value was key factor affecting stem disease in final flowering. Soil contents of available phosphorus and available potassium were key factors affecting stem disease and disease index in maturity.
出处
《中国植保导刊》
北大核心
2016年第3期42-46,共5页
China Plant Protection
基金
贵州省优秀青年科技人才培养对象专项资金
