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How to apply pesticides in fish farming rice fields
Many farmers are cultivating fish and crab in paddy fields, but there is a contradiction between the use of pesticides and pesticides to control pests and weeds. How can we effectively resolve this contradiction? First, choose pesticide species that are not harmful to fish. The pesticides that are less toxic to fish include: trichlorfon, dimehypo, dimethoate, leaf glycosides, aldicarb, phoxim, leaf blight, and cockroaches. These pesticides generally do not pose a major hazard to fish, but they must be used in the amount and concentration prescribed for the pesticide. Another class of pesticides, such as fish extract and toxaphene, are highly toxic to fish and should absolutely be prohibited. Second, choose the appropriate method of application. It has been proved that the fine rain sprayer and motor sprayer are the best for fish farming rice fields, because the droplet diameter of these two methods is less than 200 micrometers, and they have good adhesion on the plants and less impact on fish. In order to reduce the poisoning of fish in the summer, it should be applied early and late. The time should be set before the morning and after the afternoon. However, it cannot be applied in the morning during the rice flowering season, so as to avoid falling into the water after being swallowed by the fish. Poisoning occurs. Third, do a good job of fish attenuated measures. The deeper the water layer, the thinner the pesticide concentration, and the less harmful to the fish. Therefore, the deepwater of more than 3 inches must be poured before the rice field in fish farming. If conditions permit, it is best to drain the water from the fields before using pesticides to control pests and diseases. Put the fish straight into the fish ditch or fish nest, close the water inlet, block the field water, and then apply the pesticide. If the paddy field has a large area, it can be divided into several pieces of pesticides in order to make the fish avoid the area. When it is found that the fish has floating head poisoning, it should be promptly filled with fresh water to reduce pollutants.