The Relationship Between Nut Yield & Quality Patterns And Light Distribution Inside The Crown Of Delayed-open Central Leader System Of Juglans Regia ‘Wen185'

Juglans regia ‘Wen185' is one of the main walant tree cultivars in characteristic fruit indestry of Nanjiang Basin, The evacuation hierarchical tree that main branch opened angle are 45 degree wore more. With the increase of the planting area, the problem of field management had become increasingly prominent. For example, the daily management was not timely, crown shaping pruning was not in place, lead to crown was not transparent the light, resulted that the yeild of nuts and the quality of fruit were dcreased, and the effect of light distribution on nuts yeild and quality had been related to the other management areas. So used the LAI-2000 crown analyzer and the method of crown volume stereo segmentation to study the main branch opening angle is 60° of evacuation delamination of J.regia ‘Wen185' from crown leaf area index, light transmittance, fruit yield and fruit quality, then studied the relationship between the distribution of crown and the pattern of fruit quality. The main research result as follows.Crown leaf area index decreased with the seasons, fruit fast-growing period and fruit fat changes period appear growth peak, fruit near mature period to be more stable. The trend of leaf area index was middle>upper>lower, bore>central>peripheral, the biggest leaf area index appeared in the crown height 2.50~4.50 m, the distance from the tree 2.50~3.50 m in the east and 0.50~1.50 m in the west place. The vertical distribution of the light transmittance in the crown varies with the season was the largest in the middle, the upper was in the middle, the lower was the lowest. The central and inner light transmittance of crown appeared staggered during leaf expansion period and fruit fast-growing period, the central transmittance was higher than the inner and they had no obvious difference with the increase of canpy leaf curtain.In the crown of the corresponding place transmittance and the accumulation of the leaf area index were very significant negative power index, accord with Beer-Lambert's law. The crown extinction coefficient increased with the season and stabled during fruit fat changes period and fruit near mature period; the crown extinction coefficient from up to down increased after the first reduce; since the outside in first increases, then decreases in the crown.The nut yield decreased from up to down, The change of crown was peripheral>central> bore. The leaf area index of light distribution in crown was the least, the maximum light transmittance was the maximum yield area. The average weight of nut, nut kernel rate, nut fat content, nut protein content and nut total suger content the wertical and horizontal directions showed a decreasing trend, and the difference reched a very significant level. Physical quality and chemical quality of pattern changes and crown of light distribution characteristics having a a positive correlation...