Rice field phytotoxicity control measures
Pesticide damage can occur due to improper application, such as using high concentrations, uneven spraying, overuse, or applying expired products. This often results in yellow-white or brown spots on the leaves, and in severe cases, entire leaves and plants may wither and turn yellow, appearing dry and brittle. For example, when using "rice foot green" to control sheath blight, young seedlings may appear green but fail to develop properly. Similarly, high concentrations of 2,4-D and dimethyltetrachloro-chloride herbicides can cause leaf deformities.
Before applying any pesticide, it is crucial to thoroughly understand its type, properties, intended use, application method, and safety precautions. Never misuse pesticides, and avoid using them in excessive amounts or at high concentrations. Always mix and apply according to the manufacturer's guidelines. Timing is also important—some herbicides, like dimethyltetrachloro-chloride, are safest when applied during the tillering stage. Applying them before the fifth leaf stage or after jointing increases the risk of phytotoxicity.
If phytotoxicity has already occurred, drain the field immediately and refill it with fresh water. Apply quick-acting fertilizer to help the rice recover and promote healthy growth. If herbicide damage is detected early, especially during the bud or seedling stage, applying plant ash or spraying with alkaline water can help neutralize the harmful effects and reduce damage.
It’s always better to be cautious when handling agricultural chemicals. Proper training, careful planning, and following instructions can prevent many issues before they start. In case of uncertainty, consulting an expert or local agricultural extension service is highly recommended. Taking these steps not only protects your crops but also helps maintain the health of the environment.
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