Yan Qiaojun, head town of Yuqiao District, Yangzhou City, said on July 8th that the paddy rice on the 2 mu machine is in the 4-leaf stage. 30 kilograms of sprays were used to control grassy weeds in the field. They had been used for 7-8 days. Now the leaves of rice are withered and withered. He asked whether it would be possible to remediate gibberellic acid on the phytotoxic rice.
The essence of fazolyl oxadol is herbicide for systemic stems and leaves, and the drug is absorbed by the stems and leaves of grass weeds. It is immediately transferred to the growth points of tillers, leaves and roots in the weeds to inhibit weeds. Biosynthesis of fatty acids in tissue. After 2–3 days of general application, the weeds stopped growing, and then the basal part of the tiller became necrotic. The leaves showed chlorosis and the weeds died. Rice has strong resistance to fenzopyrazine, and it does not produce phytotoxicity when the seedling age is large and the dosage is small. However, serious phytotoxicity is caused when the seedling age is small and the dosage is too large. The phytotoxicity showed that the upper part of the seedlings were wilted and longitudinally rolled into thin lines, but the leaf color was still green, and the water depth was dry and dry. When the dose was small and the phytotoxicity was light, the leaves were irregular. The chlorosis phenomenon mainly occurs on newly unfolded leaves, and the chlorosis is uneven. Some of them are colored satin (the initial symptoms are similar to viral diseases. The vascular bundles in each leaf are chlorotic, and the entire leaf is chlorotic). Leaf sheaths pale. Some seedlings may be extracted from the leaves of the newborn but are encased in leaf sheaths.
Rice field application of refined fenazol oxime, generally required in the rice after the 5 leaf stage medication, the amount can not be large. Indica rice fields can generally be sprayed with 6.9% per acre of fine fazolyl spirit water emulsion 30-40 ml of water spray 50 kg fine mist. Indica rice is more sensitive to frazoxime, and 6.9% of frazoxime spirit water emulsion can not exceed 30 ml per mu. The use of drugs is too early, the rice plant is small, and the drug resistance is poor. It is prone to phytotoxicity after the application of pesticides; excessive use of drugs, but also prone to phytotoxicity. According to Yan Xuanjun, at the 4-leaf stage of rice, the use of 6.9% epinephrine, fenprolozacin, 75ml of water, and 30kg of water for spraying, when the drug is used, the seedling age is small, and the amount of the drug is too large, causing serious drug damage to rice. Harm, there are yellow leaves withered and so on.
After the application of fenfazol in the rice, mild phytotoxicity occurred. The timely application of extra-root fertilizer and spraying of urea and potassium dihydrogen phosphate promoted the recovery of rice. Appropriate spraying of gibberellic acid and other growth-promoting plant growth regulators is also beneficial to the recovery of rice seedlings. The above-mentioned paddy rice has serious phytotoxicity and is likely to have a large number of dead seedlings. Even if a large number of dead seedlings do not appear, it will have a great impact on the subsequent production. For a plot like this, it is better to destroy the seedlings from the direct seeding paddy fields with higher density of seedlings in the local area and replant them.
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