桂西北环境移民示范区柑橘园土壤营养探析

Analysis on the soil nutrients of citrus orchards in demonstration area of environmental immigrants,Northwest Guangxi.

对桂西北环境移民示范区柑橘园土壤营养状况测定结果表明 ,该区柑橘园有机质含量丰富 ,全N、全P偏低 ,水解氮、有效磷基本适宜 ,K素缺乏 ,pH偏酸性 ;且主要土壤养分变异系数均 >16 % ,土壤 pH变异系数为4 .4 % ;不同产量级柑橘园土壤养分差异主要表现于水解氮和速效钾含量 ,丰产园水解氮和速效钾含量分别为10 6 .4 6mg/kg和 76 .2 1mg/kg ,低产园分别为 96 .88mg/kg和 5 9.83mg/kg且显著低于丰产园 ,水解氮和速效钾与柑橘产量分别呈极显著和显著相关。并提出果园土壤水解氮、速效钾丰缺指标。

Soil nutrients of citrus orchards in demonstration area of environment al immigrants,Northwest Guangxi were tested.The results show that the soil ferti lity in the area is characterized by abundant organic matter,low total N, total P and total K,optimum hydrolyable N and available P,and strong acidity.The major nutrient variable coefficients in different citrus orchard soils are over 16% a nd pH variable coefficient of the soil is 4.4%.The soil nutrient differences o f citrus orchards of different yield grades are mainly shown in the amount of hy drolyable N and available K.The contents of hydrolyable N and available K are 10 6.46mg/kg and 76.21mg/kg respectively in high- yield citrus orchards and are 96.88mg/kg and 59.83mg/kg resp ectively in low-yiel d citrus orchards.There is an extre mely positive correlation between citrus yields and hydrolyable N and a positive correlation between citrus yields and available K.Also,the indexes of abundance and shortage of hydrolyable N and available K in soils are put forward in this paper.