The walnut output depends mainly on the size of the nuts and the weight of the nuts. When the walnuts reach the ripening stage, the size of the fruit is basically shaped. There was no significant difference in the average values ​​of the longitudinal diameter, transverse diameter, and edge diameter of walnut nuts in different harvesting periods. However, the accumulation of dry matter inside walnuts is still increasing. The survey data showed that at this time, the average daily weight of walnuts in the tree increased by 0.07 grams, and the later the harvest was within a certain period, the greater the weight gain. Harvesting can be increased by 10% for every 10 days before harvest. The single fruit weight before harvesting grew rapidly before August 25, and the increase in production was mainly before August 25. It can be seen that early harvest of walnuts will inevitably reduce production.
The closer the walnuts are to maturity, the richer the fruit, the increased nucleolus weight, and the increasing rate of kernels. The increase in single kernel weight of walnuts is mainly due to the increase in weight of walnut kernels. With appropriate delays in the harvested walnuts, the weight of the walnuts increased significantly, and the average daily weight gain was 18%. Tests have shown that the weight of walnut kernels increases sharply with the delay of the harvesting period, and the increase is higher than the increase in the kernel rate and plumpness.
Before August 25th, the walnut kernel weight increased by 13% or more every week. The Beijing Institute of Forestry Research had learned that walnuts were harvested half an hour earlier, and the rate of kerneling and oil output dropped by 5% to 10%. The harvest period is postponed from August 28 to September 19. The oil content of walnut kernels can be increased by 80%. In Shangluo, a key area of ​​walnut production in Shaanxi Province, the people’s experience is that they harvested before August 25. The nucleolus are thin and often empty grains or half benevolences, failing to meet commodity requirements.
Harvesting of walnuts will sooner or later affect the quality of walnuts. As early as harvested, walnuts are brown or darkly peeled, light and very astringent. Harvested from August 25th to September 1st, the walnut color is brownish or light brown, and the taste becomes fragrant and slightly astringent. After harvested on September 1, the walnut kernel is white-yellow and has a fragrant and crunchy flavor. The late-harvested walnuts have a high degree of ripeness. The green skin is cracked. It is easy to remove the green skin. The peeled surface is clean and beautiful, and it is easy to sell.
In Shaanxi, the majority of the people in the walnut production areas are afraid that the mature walnuts will be lost, or they will fear that the harvest of walnuts will affect their cultivation of wheat lately, or that the walnuts will be sold at high prices in the morning. Habits, more suitable walnut harvest time ahead of 10 to 15 days. Although the city of walnuts grabs high prices in the morning market and sold some more money, the total output of walnuts produced has decreased a lot.
In Sichuan, valleys, hills, and low-middle mountain areas, harvesting is preferred in early September, and high mountain areas are preferred in the first half of September. Walnuts ripen before and after the White Dew Festival, appropriately delaying harvesting for a few days, and harvesting the best in batches.
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