The cause of quinclorac acid phytotoxicity
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Causes of quinclorac acid physiology: First, the application time is earlier. According to the test, before the first leaf stage of the seedlings, especially in the period of the seedlings, even if the quinclorac is applied in a conventional amount, the phytotoxicity is highly likely to occur. It is safer to use the seedlings after the 2 leaf stage. The second is the impact of climate factors. Some time before the application of the plant, there was continuous rain and low temperature, and the quality of the seedlings was poor. It was easy to cause phytotoxicity to rice seedlings after application. Third, different rice varieties have different sensitivities to quinclorac. Generally, conventional rice is more sensitive than hybrid rice, and the underdeveloped roots of the seedlings are more sensitive than the roots of the seedlings. Third, the dosage is too high. The quinclorac is overused during the appropriate period of use, especially in the case of excessive use of the seedlings before the 4-leaf stage. Generally, the amount of pure quinclorac should not exceed 25 grams per acre (equivalent to 50% quinclorac 50 grams).
Jiangsu Agricultural Science and Technology News 