Controlling the appropriate amount of broadleaf grass

Valerian is a leguminous herb, the scientific name of yellow flower bud, also known as broccoli, grass head and so on. In recent years, the planting area of ​​alfalfa in Yangzhong City has gradually increased, but some grasses are heavier, especially broad-leaved weeds are difficult to control. In this regard, we used 48% chlorpyrifos to test the broadleaf weeds in the sedge field.
The experiment was carried out with 5 different doses of treatment, using 48% of the herbicide water 150 ml, 200 ml, 250 ml, 300 ml and 350 ml per acre, and 30 kg of water was sprayed. The broad-leaved weeds in the experimental field mainly include the Miva cans of the Dianthus family, the coiled ears, the sorghum, the gray ash, the hedgehog of the genus Polygonaceae, the mother-in-law of the Scrophulariaceae, the sorrel of the sorrel, the scorpion, the cross Amaranth, wild rapeseed, sauerkraut, and sedge of the genus Rubiaceae. Among them, the gray ash has the highest frequency, accounting for 19.57% of the total grass volume; followed by the miva pot, accounting for 15.22% of the total grass volume; the mother-in-law and the leeks account for 11.96% of the total; The scorpion and the sorrel scutellaria each accounted for about 10% of the total; the sputum, the ear, the scorpion, the hedgehog accounted for about 21% of the total. The grass weeds in the field are uniformly treated with high-efficiency flupirtine.
According to the test situation, the different treatments of 48% chlorpyrifos have a great difference in the control effect of broadleaf weeds, and the control effect increases with the increase of dosage. The treatment with 150 ml per acre has the worst control effect, and the control effect of plant strain and fresh weight is only about 57%; the fresh weight control effect of 200 ml, 250 ml, 300 ml and 350 ml per acre reaches 88.27 respectively. %, 95.35%, 98.89% and 99.11%. Treatment with a dosage of less than 250 ml per acre did not cause phytotoxicity to valerian, while treatment with a dose of more than 300 ml showed different degrees of phytotoxicity, which was characterized by yellowing of the edge of valerian leaves and subsequent blasting, but no whole plant died. The phenomenon is that plants with phytotoxicity usually grow new leaves after 10 days, and the visual observation is similar to that of normal plants.
The test results show that 48% of the herbicide water-killing agent has good control effect on broad-leaved weeds in the alfalfa field, and it is recommended to use 250-300 ml per acre. Attention should be paid to the use of medicinal plants at the seedling stage and weeds in the 3-5 leaf stage. The overdose of the grass is too late, and the weeds are in the period of vigorous growth. The weeds are blocked by the weeds and the weeding effect is affected.
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