Spraying pesticides on fruit trees in order to prevent and control its diseases and insect pests, and hope to achieve high quality and high yields of fruit, can be used for interviews at the grassroots level. The reporter found that some farmers often cause unnecessary losses because of the misunderstanding of pesticide spraying into fruit trees. In this connection, the reporter interviewed Chun Xi, a research fellow at the Plant Protection College of Northwest Agriculture and Forestry University, to give authoritative guidance to the growers. Shi Chunxi pointed out that spraying pesticides has many contraindications, and spraying pesticides on fruit trees is also the same. The majority of growers must firmly grasp the following four points.
First, the high temperature should not be sprayed when the time is now a hot summer, many fruit trees into young fruit. Shi Chunxi reminded the majority of growers that at this stage, in view of the characteristics that most pesticides should not be sprayed under high temperatures, avoid spraying during the high temperature period of the day. There are three reasons for this. One is that the temperature is too high, the water evaporates quickly, the concentration of the liquid is increased, and the phytotoxicity is prone to occur; the second is that the temperature is too high, the pesticide breaks down quickly, and any tree with internal absorption and infiltration prevents pests and diseases. The effect will be poor; Third, spraying when the temperature is too high, due to volatile agents, can easily lead to poisoning operators.
Second, the spray concentration should not be blindly high Many farmers in the management of fruit trees to develop a habit of blindly increase the concentration of pesticides, that the greater the concentration of pesticides, the better the effect of pest control, for this point, when Chunxi specifically pointed out that this It is a misunderstanding. He reminded growers that blindly increasing the amount of pesticides used in agricultural production in order to achieve good control results in many cases will have a negative effect. He suggested that fruit growers should spray pesticides on fruit trees in summer, and spray them in accordance with the recommended concentration of pesticides to prevent phytotoxicity due to high concentrations and cause unnecessary losses.
Third, it should not be used too cold well water and sewage dispensing in the distribution of agricultural water use, when the spring hi recommended the majority of growers, do not use the water just extracted from the well, one because the fruit trees in high temperature weather, leaf temperature Elevated, the use of pesticides that are too cold for well water can easily cause irritation to fruit trees after spraying. “This principle and people in a very hot case, taking a shower and taking a cold bath is easy to catch a cold.†Shi Chunxi said that because the well water contains more calcium and magnesium minerals, it can easily react with chemicals to form precipitates. Thus reducing the efficacy.
In addition, the sewage contains more impurities, impurities will block the nozzle, but also undermine the stability of the liquid. At the same time, some of the components in the sewage will also chemically react with the liquid and reduce the efficacy.
Fourth, the selection of pesticide species should be cautious in the selection of fruit spray pesticides, Chunxi remind farmers should choose as much as possible, high efficiency, low toxicity, low residue, safety, stable performance, low irritant, strong environmental performance of pesticides. He took the example of pesticide spraying before apple bagging. It is suggested that the fruit growers who grow apples should avoid as much as possible some pesticides containing heavy metals during the pesticide spraying, because this kind of pesticide is liable to cause fruit rust. The best choice is water suspension agent. , Emulsions, Microemulsions, Dispersants, etc. These formulations of pesticides.
Multi Span Plastic Film Greenhouse
Arch greenhouse is a kind of economical greenhouse, which is welcomed by the users with graceful curve form and low cost. It has beautiful appearance, fluent visual, reasonable structure and good performance for keep temperature. It is economical greenhouse because of its relatively low manufacturing cost. It can be applied in most areas of China. Double membrane greenhouse is used more in north of China, while single film greenhouse is used more in southern region. It can get maximum sunlight when visible light is within the scope of 0.4 to 0.7 microns and form a thick envelope, which can effectively prevent heat loss and prevent the invasion of cold air. Adopting a double membrane can greatly improve heat preservation performance of the greenhouse and save operating cost. The top cover material is polyethylene lifelong anti-fog and anti-dipping film po-covering. The outer of it has the function of UV protection and the inner has the function of preventing from the sets of dew. According to the needs of customers, the sides of the greenhouse can be covered with polyethylene lifelong anti-fog and anti-dripping po-covering or polycarbonate hollow plate.
Pc Board Greenhouse,Pc Sheet Covering Greenhouse,Greenhouse Pc Board
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.engreenhouse.com