山地低产柑桔园改造措施松溪县位于闽北山区，现有柑桔园大多是８０年代初栽植。由于建园时只求数量忽略质量，开山做梯时土壤腐殖层遭破坏，心土酸性强，透气性差，有效磷钾含量低，再加上管理粗放，柑桔树严重发育不良，１９８９年全县平均每６６６．７ｍ２产量２６５ｋ... Transformation of lowland citrus orchards in mountainous areas Songxi County is located in mountainous areas of northern Fujian and most of the existing citrus orchards are planted in the early 1980s. Due to the quantity neglected only when the park was built, the humus layer was destroyed when the mountain was used as a ladder, the soil acidity was strong, the air permeability was poor, the effective phosphorus and potassium content was low, and the extensive management and citrus trees severely stunted. In 1989 The county average 666.7m2 output 265k ...