Effect Of Shading On The Growth And Fruiting Of Blueberry And Its Biological Mechanics

Effect of different shade degree and manner on phenophase, microclmate, growth, photosynthesis characteristics, the leaf chlorophyll content, solube protein content, fruit development, fruit quality and yeild of Blueberry. In order to make clear the change rule of some physiological and ecological character of Blueberry by covering with shading net. And find correlation factors . Thus we can regulate planting circumstance and ameliorate culture measure within reason in China. Consequently improve the yield and quality of Blueberry.There are two different shade manners in this examination, they are complete-shading(completely cover trees with shading net) and half-shade(cover with shading net over the trees). Shade materials are black overshadow net (83% and 65% of full light).Covering with shading net for each variety by complete-shade and half-shade. So for each variety there are four treatments(complete-shadel,Complete-shading2, half-shading1, half-shading2), light intensity are 21%,38%,65%,83% .at the same there is CK treatment The results are as follows:1. Shading affected pheophase of Blueberry greatly. At the shading prophase, the phenophase of each treatments appeared nearly the same time, from the florescence, the phenophase of each treatments appeared at the different time with the time prolonged. Moreover the bearing period was delayed with the increase of the shading degree. Thereinto the phenophase was delayed 4-10 days at the complete-shading treatments, the phenophase was delayed 2-4 days at the half-shading treatments.2. Shading was favourable to improve the microclimate in canopy of Blueberry. After shading, soil and air temperature declined. and soil water content, relative humidity in canopy increased. At the same time, the light intensity was decreased 0.58×10~4-4.62×10~4Lx at the shading treatments.3. The shading treatments grow faster in height, crown, the growth of branch than CK treatment. with the increase of shading degree, the thick degree of branch was minished. Thereinto in the complete-shading treatments .The branches grew excessively and the branch became the thinnest. But there was no significant difference between half-shading treatments and CK treatment for the thick degree of branch. So moderate shading(two half-shading treatments) is helpful to its growth and development.4. Increasing shading markedly increased the leaf area. reduced specific leaf weight and air hole...