In recent years, the rapid development of China's apple industry, Apple's quality has greatly improved, management technology is being reformed step by step, and the development of China's apple industry has attracted the attention of countries in the world. There are still many problems in production. In terms of technology, after years of research by all scientific and technical personnel at the Apple Experimental Station of Northwest Agriculture and Forestry University, the thinning technology proposed on the basis of the four key technologies was widely promoted in Baishui and other places in Shaanxi Province. The benefits are obvious: , Less cut, less sparse, longer, and more.
Status of Management Technology China's apple technology has been reformed step by step. The large-scale changes proposed in previous years have temporarily eased the number of individual branches. However, the entire park is still closed and not ventilated. The effect on the quality of fruit is not obvious. Field operations Difficulties, the entire tree becomes malformed and grows, which is extremely unfavorable to the development of the entire park. The resulting pests and diseases are also very serious. The apple industry in China is progressing towards pollution-free, high-quality organic apples. The backward deformed production method is far from not enough. The previous great reforms have caused many growers to die and fail to understand the basic physiology of the tree. A tree with good endures has made many wounds, rot disease has occurred frequently, and everything in the world is justified. When you destroy others, people feel bad. ? What is the reaction of others? Therefore, we must trim the apple tree to follow the basic physiological structure of the tree, so that the tree has a good body to produce good fruit, and vigorous destruction can only lead to the destruction of the entire garden. In Japan, a Joe tree is still very lively for seven or eighty years. A branch can grow ten meters, a tree can produce several hundred pounds, and an acre garden can not exceed twenty trees. The operation is very convenient. .
The thinning technology is imperative. The thinning proposed by the Northwest Experimental Station of Agriculture and Forestry University is very scientific. It mainly emphasizes the fundamentals of solving the light, and fundamentally solves the problem of unobstructed ventilation in the garden. The thinning is mainly for old gardens, mainly for the entire whole park. There are many kinds of thinning, mainly focusing on interleaving. Pruning after thinning is simple, the amount of fertilizer is reduced, and the operation is simple. It is effectively combined with the dual-optimal ground management model. The yield is not low and the fruit quality is significantly improved, creating the basis for the production of high-quality organic apples.
Finally, it is hoped that the majority of farmers will change their concepts, consider input-output ratios comprehensively, and proceed from the long-term interests to make their orchards produce sustainable products.
Catalysts can induce chemical reactions to change and make chemical reactions faster or slower. Catalysts are also called catalysts in industry. The composition, chemical properties and quality of the catalyst did not change before and after the reaction. It mainly includes solid acid-base catalyst, molecular sieve catalyst, metal catalyst, metal oxide and metal sulfide catalyst, and complex catalyst.
1. Acid-base catalysts: Petroleum refining and petrochemical industry are the largest application fields of catalysts, occupying an important position in the national economy. Acid catalysis plays an important role in petroleum refining and petrochemical industry. Solid acids are further divided into Blans Te Um (B acid) and Lewis acid (L acid). Typical solid base catalysts: MgO, CaO, SrO2, etc; typical solid L acid catalysts: AlCl3, FeCl3, etc.
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