In Japan, the thinning of flowers and fruits of fruit trees is very thin, and the whole ear of fresh grapes is relatively thin, which is generally divided into two steps: thinning flowers and dropping grains. Rough machining is mainly based on the strength of varieties and fruiting branches. Varieties with early maturity, small grain size and reliable fruit setting are completed before flowering, while varieties with late maturity, large grain size and unstable fruit setting are basically judged about one week after flowering. Measures include ear thinning, ear removal and ear tip cutting. The standard of ear retention is basically the same as that in China. In general, vines keep one spike, strong vines keep two spikes, and weak vines don't. The work of fruiting and heading is very detailed, usually starting from three weeks after flowering and ending before the fruit softening period. Bagging management should be completed as soon as possible. The grading standard is very strict, depending on the contract sales requirements.

For example, when Kyoho is sold as a high-grade gift fruit, it is required to control the weight of each ear to be 400-500g, the number of fruit grains to be 35-40, the weight of a single grain to be 65,438+03-65,438+04g, the distribution of fruit grains to be elastic and moderate, the ear shape to be plump and the color to be beautiful. In order to achieve this standard, we should grasp three points. First, after the secondary ear and secondary ear at the upper part of the fruit ear are all removed, the central ear axis must be controlled at 9 ~ 10 cm from top to bottom, and the lower ear tip with shaft that is too long should be cut off. The second is to remove the underdeveloped small fruit particles, especially the small fruit particles that are not easy to be colored by light inside the ear. 3. Keep 35 ~ 40 pieces of fruit, and the fruit stalks should be thick, regular in shape, similar in size and evenly distributed; If it is sold as a popular edible fruit, it is required to control the weight of each ear about 300 grams, the number of fruit grains about 25, the weight of a single grain about 12 grams, and the ear shape and coloring standard remain unchanged.

Therefore, when thinning and pruning the ear, the ear axis should be cut off by 7 ~ 8 cm, and about 25 fruit grains should be left. Other technical requirements remain the same as above. In order to operate accurately and conveniently, pruning workers often mark the fruit thinning shears with special sizes.

Thin the fruit, and cut off the grape spike length mark.

In order to ensure the high quality of fruit, some grape production farms also have certain requirements for the average leaf area of a single grain. For example, the ideal fruit color and leaf area per grain should be 8 cm2/ grain, and the leaf area containing sugar should be 12 cm2/ grain.