Eff ects of Calcium Cyanamide on Rhizosphere of Soil Environment and Growth Characteristics with Continuous Planting of Capsicum annuum L．
（1Institute of Vegetables and Flowers，Chongqing Academy of Agricultural Sciences，Chongqing 401329，China；2Characteristic Economic Crops Management Center of Chongqing Wushan，Chongqing 404700，China；3Chongqing Agricultural Technology Extension Station，Chongqing 401121，China）
Abstract：Abstract：Using the processed pepper variety‘Yanjiao 425’as the test material，culturing in a greenhouse，the effects of different application amounts（0.3、0.6、0.9、1.2、1.5 t · hm-2）of calcium cyanamide（CaCN2）on rhizosphere soil environment and plant growth with continuous planting of Capsicum annuum L. were studied．The results showed that under the treatment of T4（1.2 t · hm-2）and T5（1.5 t · hm-2），the soil physical properties（such as soil porosity，saturated water content，field water holding capacity，saturated hydraulic conductivity），the soil nutrient contents（such as available nitrogen，available phosphorus，available potassium and organic matter）were signifi cantly higher than those of CK．These treatments maintained high soil urease activity and soil bulk weight was signifi cantly lower than CK．In the peak fruiting period of pepper，there was no signifi cant diff erence in plant height，spreading degree， fruit setting number of single plant，fruit length and plot yield of pepper under diff erent application amounts，but they were significantly higher than CK．With the increasing dose of CaCN2，the pepper diseases were effectively controlled，and the incidence rates were only 8.6%（T4）and 5.5 %（T5）．In summary，the applications of CaCN2 at 1.2 t · hm-2 and 1.5 t · hm-2 could eff ectively reduce the incidence rates of continuous cropping pepper，significantly improving the rhizosphere soil environment，and promote its growth and development．Considering the application eff ect and production cost，CaCN2 application amount of 1.2 t · hm-2 was recommended for mitigating the obstacle of continuous cropping pepper．
