香葱连作障碍的成因及其修复试验

选取不同连作年限(0、2、4、6、10、15 a)的葱田土壤,测定土壤的养分、微量元素和重金属含量,发现不同连作年限土壤中的铁、硼、镁等微量元素含量丰富,但是连作葱田土壤的容重、有机质含量和铵态氮含量有不同程度降低,硝态氮含量显著提高。用5种土壤改良剂对连作年限为15 a的葱田进行土壤淋施处理,试验结果表明,奥普尔冲施肥使土壤中的硝态氮含量降低11.57%,铵态氮含量提高50.27%,香葱产量提高2.66%,是最佳的土壤改良剂。

Causes and Solutions for Continuous Cropping Obstacles in Chive Production

In order to find out the causes for continuous cropping obstacles in chive production in Liujiang, Guangxi province, we determined the contents of nutrient, micro-nutrient and heavy metals of the soil under different continuous cropping years (0 year, 2 years, 4 years, 6 years, 10 years and 15 years). The results showed that the content of micro-nutrient (Fe, B, Mg) in the soil samples were abundant, but the soil bulk density, contents of organic matter and ammonium nitrogen were decreased with the continuous cropping years increased, however, the content of nitrate nitrogen was increased. Five soil amendments were used for soil remediation experiments carried out in the soil under fifteen years continuous cropping. The results showed that, OPAL liquid fertilizer was the best soil amendment which could decrease the content of nitrate nitrogen by 11.57%, and increased the content of ammonium nitrogen by 50.27% and yield by 2.66%.