信阳市茶园土壤有机质和速效氮磷钾的分布

研究表明,信阳茶园土壤有机质处于低等水平,93.5%的土壤有机质含量在9~20 g/kg,速效氮含量较高,变化范围在109~350 mg/kg,94%的土壤速效氮含量超过120 mg/kg;51.6%的土壤缺磷,而钾素肥力较高。因此,在茶园土壤养分管理上要综合考虑土壤养分状况,茶树的养分需求和对生态环境的影响,适当提高有机肥用量、控制氮肥,有针对性施磷,少施或不施钾肥,并兼顾中、微量元素的平衡。

Distribution of Organic Matter and Available N-PK in the Tea Garden Soil of Xinyang

The results showed that the organic matter content is low in tea garden soils of Xinyang,ranging from 9 to 20g/kg in 93.5% of the soils tested.The available nitrogen varied between 109 and 350mg/kg,with 94% of the soils higher than 120mg/kg,which went beyond the limit for tea tree growth.51.6% of the soils were deficient in P,but rich in K.In order to provide adequate nutrients to the tea trees,it is recommended to increase the rate of organic and phosphate fertilizers,decrease the rate of nitrogen,and apply less potash according to the soil nutrition status and the environmental factors.