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"Jiro" persimmon is a Japanese variety and belongs to the sweet persimmon variety. Since its introduction, it has exhibited a strong adaptability. It is suitable for cultivation from south to north, in order to guide the selection of a suitable tree shape and cultivation in the production of "Jiro" persimmon. Density, yield and quality of "Jiro" persimmon were improved. Canopy analysis was used to determine the photosynthetically active radiation in the "Jiro" canopy layer at different planting densities and related analyses were conducted.
Canopy analysis results showed that the photosynthetically active radiation at different heights and azimuths of the canopy showed a single-peak curve change, and the photosynthetically active radiation at each location and orientation varied greatly between the maximum value and the time of occurrence in one day. At the same density, the significant changes of photosynthetically active radiation in each part and azimuth of the persimmon trees in 4 days a day are also inconsistent. The parameters of zenith angle and leaf state distribution have basically no change in the same area, and basically have no effect on the effective radiation value, but the orchard density and direction have a greater influence on the effective radiation value.
In Jiro, the production of persimmon fruit trees, the light directly affects the Jiro's yield and fruit quality of persimmon, and the closure of the orchard and poor light conditions calm the general problems in the main production areas of persimmon trees in China. The key to solving this problem lies in The canopy analyzer was used to effectively transform the fruit trees to form a crown size and a reasonable spatial distribution of branches suitable for varieties, rootstocks and planting densities to ensure good ventilation and light transmission in the canopy.
The canopy structure of a plant determines its light-receiving state, and a reasonable and canopy composition is conducive to constructing a high-yield population, providing a theoretical basis and reasonable adjustment measures for the high-yield breeding and cultivation of crops. The canopy analyzer introduced by Topsun is a physiological and ecological instrument for measuring plant canopy parameters. It has the advantages of excellent performance, portability, rapid measurement, and easy operation, and can meet the measurement requirements of different working environments. It is the current research plant crown. The ideal instrument for optical properties of the layer.