【摘要】 本文通过定位试验、盆栽、化验、电镜等手段,对向日葵茬口进行了广泛的研究,在产量、土壤水分、土壤养分、田间杂草、病虫发生以及根际微生物等方面取得了科学数据。主要结论是:向日葵茬口反应与玉米茬相当接近,并与土壤肥力有关,提出茬口指数概念,用数值来反映茬口的优劣。更多还原

【Abstract】 The study on effect of sunflower in rotation system was conducted by the ways of located test, planting in pots, laboratory analysis and electric microscope.The data were obtained for seed yield, soil moisture, soil nutrient, weeds in field,diseases and pests,and microorganism in root zone. The result in study has shown that succession index of sunflower is close with that of corn and related with soil fertilizer.That sunfower is continuously planted would result in seed yield decrease. The succession index has deen suggested as a method for indentifing crop succession in rotation. There were effects of sunflower on rotation crops. Number of microorganism in root zone was determined, fourty-nine familys, genus and population were identified.更多还原