Research On Transformation Of Closed Longan Tree And Integrated Management

A research was launched on light intensity, LAI, the values of SPAD, chlorophyll fluorescence parameters, roots, and the fruit quality, output through the tree form study, thinning study and fertilization in the water hole, which indicates that:1. Light intensity. The narrow opening tree form and opening with thinning improve the light intensity obviously, which provide a better surrounding for the growth of the trees.2. LAI. The narrow opening tree form and opening with thinning maintain a suitable range of LAI after the treatments, they separately are4.91and4.11.3. Amount of chlorophyll, nitrogen, phosphorus and potassium, output and quality. The narrow opening, opening with thinning and fertilization in water hole improve the amount of chlorophyll. The narrow opening tree form improves the nitrogen while does nothing to phosphorus and potassium. The fertilization in the water hole improve the nitrogen, phosphorus and potassium obviously. The output of per tree, weight per fruit, soluble solid, edible rate is separately higher than the contract is27.56%,34.03%,4.40%,12.16%; the opening with thinning is separately higher than the contract is11.88%,10.11%,3.28%,12.26%; the fertilization in the water hole is separately higher than the contract is24.07%,22.35%,2.93%,19.56%.4. Chlorophyll fluorescence parameters. The narrow opening, opening with thinning and fertilization in the water hole all obviously improve the activity of PS II, openness and self protection of photosynthetic system.5. Roots. The narrow opening tree form is good at the growth and distribution of roots. The roots weight of narrow opening occupies74.07%of the whole roots in the range of0-40cm, while the contrast is44.09%. The narrow opening extends the roots to80-100cm deep in the soil, while the contrast does nothing.