To adopt greenhouses, small sheds and mulching film to cultivate watermelon, because the protection of the temperature and humidity conditions suitable for weed growth, coupled with the inconvenience of manual weeding operation, resulting in vigorous weed growth, serious damage. There are few herbicide products registered in the watermelon fields in China, and many farmers use herbicides in the watermelon fields, resulting in poor weed control and even phytotoxicity.
Herbicides that can be used in watermelon fields except for herbicides such as amide, metolachlor, sec-butyl, quizalofop, flupirtine, etc. Amines, diphenyl ethers, oxyfluorfen, dinitroaniline pendimers, cyclic imines, triazobenzenes, paraquat, carbamates Benzene oxygen, such as fluazifop-Porcine, etc. are available for introduction of weeding in watermelon fields. Among them, butachlor has become the first choice for weed control in most watermelon fields due to its relatively broad spectrum of grass weed killing, high safety and low cost.
One of the causes of herbicide poisoning is improper product selection. Some herbicides that are registered for crops such as soybeans, peanuts, and cotton are not suitable for use in watermelon fields, especially acetochlor. Watermelon is sensitive to them. After application, the growth is inhibited, while heavy crops are killed. Serious or even no income. The second is that heat damage will increase drug harm. Greenhouses and small arches of watermelons are prone to heat damage due to steep rises in temperature and failure to lift the membranes in time. At this time, the use of herbicides with high volatility can easily cause excessive drug concentrations in the air and cause serious damage. Third, poor drainage in the field. During the growth period of watermelons, there are more rainwaters, and the activity of metolachlor and other drugs in the soil waterlogging conditions is greatly increased, and the safety is drastically reduced, which can easily cause drug damage. In addition, in sandy soils and soils with low organic matter content, some herbicides are liable to infiltrate with rain and cause phytotoxicity to watermelons.
Herbicides use technical points selected herbicide registered on the watermelon, and strictly follow the instructions for use. At the same time, according to different cultivation methods and the occurrence of weed populations, appropriate pharmaceutical agents should be selected. In the watermelon fields, weeding is mainly based on soil sealing. Usually, we apply pesticides before seeding or before transplanting. Post-emergence shoots and leaves should be treated with grassy weeds, such as quizalofop, and flupirtine. Wait. In areas with high rainfall or poorly drained fields, drugs such as metolachlor are recommended to use low amounts. Greenhouses and small archways Watermelon fields Because the temperature is high, the liquid is easy to evaporate. It is necessary to timely lift the membrane and timely ventilate the air to prevent the hyperthermia in the shed from causing phytotoxicity. The dose should be used to ensure safety. Plastic film mulch is generally limited to the cover film spraying, not all field application.
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