潘云保是山东省牟平县水道镇北税目村的农民技术员,去年,他承包的1.2亩苹果园里,共产果6090公斤,单产5075公斤。潘云保承包的果园熟土层平均深度不到20厘米,土壤有机质含量不到0.4％,67棵果树品种包括青香蕉、金帅、小国光,为8—16年生,为啥能创出亩产万斤果的高水平?潘云保说是依靠科学,对果树进行了巧管理。他的高产管理经验是: 一、修剪把好三关修剪是促发果树建壮、调节光照、培养大果好果的关键。修剪要把好三关。一是适时。清明前,将果树全部剪完。因为这时的果树冬眠期结束,果树的深根系已经萌动,及时修剪能避免树体养分消耗,调节果树的营养生长和生殖生长的平衡关系。二是适当。因树龄不同,所剪方法亦不同。十六年生果树,大枝 Pan Yunbao is a peasant technician in the northern tax village of Shuipu Town, Muping County, Shandong Province. Last year, he co-contracted 1.2 acres of apple orchards with a total output of 6,090 kilograms of fruit and a yield of 5,075 kilograms. Pan Yunbao contract orchard mature soil layer average depth of less than 20 cm, soil organic matter content of less than 0.4%, 67 species of fruit trees including green banana, Jinshuai, small country light, 8-16 years old, why can create million per mu The high level of pounding fruit? Pan Yunbao said that he has relied on science to make clever management of fruit trees. His high-yielding management experience is: First, pruning a good three-off pruning is to promote strong fruit tree, adjust the light, the key to cultivate fruit. Trimming should be good off. First, timely. Before the Ching Ming, cut all the fruit trees. Because at this time the fruit tree hibernation period, the deep roots of fruit trees have been sprouting, pruning in time to avoid tree nutrient consumption, regulating the nutritional balance of fruit trees and reproductive growth. The second is appropriate. Due to different ages, the shear method is also different. Sixteen-year-old fruit trees, big branches