There are many types of rice herbicides on the market, although the effects are not good or bad, but they can not avoid the problem of phytotoxicity. Herbicide phytotoxicity seriously affects the normal growth of rice. What are the causes of rice herbicide phytotoxicity?
First, the impact of human factors
1. The dosage is not accurate, the amount of pesticide is too large, and some intentionally increase the dose in order to pursue good herbicidal effect.
2, insufficient water consumption, in order to save labor, save time, save trouble, insufficient water, the concentration of liquid medicine is too large to produce phytotoxicity, in addition, spray medicinal water is not clean, turbid, block the nozzle, the drop shape of the medicine is not foggy.
3, pesticide preparation is not standardized, did not use "secondary dilution" dispensing, the medicine bag (bottle) opened, directly poured into the medicine box, so that the concentration of the drug solution is not uniform, resulting in phytotoxicity.
4, the agricultural machine operator operation is not standardized, parking change, fertilizer, steering, fault repair does not close the spray switch.
5, do not look at the label when using pesticides, blind medication. The label clearly indicates that the sandy soil should be used with caution, and the temperature is high and the phytotoxicity is likely to occur.
Second, the impact of environmental conditions
Climate anomalies are the main cause of this phytotoxicity:
1. Humidity: May is the timely sowing date of my flag millet. The climate of our flag was abnormal in May last year. It is different from previous years. According to the data of the flag meteorological bureau, the total rainfall in May was 110.8 mm, 62.1 mm more than the previous year. Such a large humidity is beneficial to the exertion of herbicides, and the second is that heavy rain causes the liquid to leach into the deep layers of the soil, causing phytotoxicity.
2. Temperature: In May last year, the temperature of our flag was abnormal. The extreme maximum temperature of the whole flag was 36.6 °C, and the extreme minimum temperature was -0.6 °C. The temperature was too high and the temperature was too low, which was easy to produce phytotoxicity. Due to the low temperature, some valleys were also caused. Blight disease occurs.
Third, the soil factor:
1. There are many kinds of millet in soils with thin ridges such as hillsides and dry land. Soil organic matter content is low or sandy soil is prone to phytotoxicity.
2, long-acting herbicide pesticide residues: the front of the millet is mostly corn and beans, while corn, beans, and more long-acting herbicides such as atrazine or sulfamethoxazole residues cause phytotoxicity.
Fourth, the impact of device factors
The spray equipment on the planter is self-manufactured and installed, and all technical indicators can not meet the requirements of spraying herbicides. Mainly manifested in:
1. There is no filtering device, and the nozzle is blocked, and the spray is not formed.
2, there is no stirring device, so that the agent is not evenly stirred or sinking, the concentration is not uniform.
3, agricultural machinery and agronomic (spray herbicides) combined with problems, agronomy, herbicides should be sprayed on the surface, and the current agricultural machinery does not spray the herbicide on the surface, but sprayed in the ground, so that the seeds are "medicated soil "Break or spray directly on the seeds to cause phytotoxicity."
More pesticide knowledge, please pay attention to pesticide network
Foshan Nanhai Xin Jianwei Hardware Co., Ltd , https://www.aaghardware.com