一、整形修剪主杆疏层形:树体结构特点是具有中央领导杆,杆高50厘米左右,共有主枝6-8个,分3-4层,第一层主枝3-4个,主枝开角约为60°,每一主枝上有4-6个侧枝,第二层主枝2个,开角为45°-50°,第三.四层各有主枝1个,开张角度小于45°.第二.三.四各主枝上有1-3个侧枝.第一.二层间距为80厘米左右,第二.三层和第三.四层间距为50-70 First, plastic pruning sparse main bar: tree structure is characterized by a central leader with a pole about 50 cm high, a total of 6-8 main branch, sub-3-4, the first layer of the main branch 3-4, The main branch open angle is about 60 °, each main branch has 4-6 lateral branches, the second main branch 2, the opening angle of 45 ° -50 °, the third. Each of the four main branches 1, The opening angle is less than 45 ° .Secondly, the three main branches have 1-3 side branches. First, the distance between the two floors is about 80 centimeters, the second, the third and the third, the distance between the four floors is 50-70