Discussion of the changes with latitudes of crown height and crown shape in the hedgerow orchard

The author calculates the solar location at each time of different latitude areas on certain days using astronomical triangle formula, and calculates hedge definitive shape angle that can satisfy shining of the fruit tree in the hedgerow orchard. For different latitude areas, under the condition of certain crown span crown section longitudinal is changed to reach the mathematical model, which provides basis for confirming crown height and the adaptive crown shape of different latitude areas as well as the adjustment of the individual parameter to raise or reduce crown height. A theory was put forward regarding reasonable cultivation and trim of the fruit tree in the hedgerow orchard.