柑桔小老树,树冠衰弱、矮小,发枝少,枝梢短瘦,只开花不结果或很少结果,因此,必须改造。改造措施有: 一、深耕改土,增施有机肥料土层深,根系分布深,吸收面积大,能充分利用土壤养分和水分,提高耐旱耐寒能力,树势强,植株寿命也较长。一般要求土层深度在1米以上,土壤有机质含量在2％以上。深耕可采用壕沟式的深翻方法。第一年在行间挖壕沟深翻,次年或隔一年在株间挖壕沟,沟深0.8—1米左右,沟宽视株间距离而 Citrus small old tree, crown weak, short, less hair, shoots thin, only flowering no result or little result, therefore, must be rebuilt. Transformation measures are: First, plowing farming, organic fertilizer by increasing soil depth, deep root distribution, absorption area, can make full use of soil nutrients and water, drought tolerance and cold tolerance, strong tree vigor, plant life is also longer. The general requirements of the soil depth of 1 m above the soil organic matter content of 2% or more. Deep plowing can be trenched deep plowing method. In the first year, ditches were dug deep in the rows, and ditches were dug in between the strains in the following year or year after year. The ditches were about 0.8-1 m deep,