Paraquat delisted, glyphosate problem highlighted

In July 2016, paraquat was completely withdrawn from the market, and the orchard herbicide products faced a gap period. Many people chose glyphosate to replace it. However, in recent years, it has been found that the amount of glyphosate used is increasing, the cost of medication is increasing year by year, and the herbicidal effect is significantly decreased.

Glyphosate, as a common herbicide, is easy to produce resistant weeds such as milkweed, Pennisetum and jiejiecao in the field after long-term use; Glyphosate passivates and degrades itself through the trace elements in the soil. In this process, the content of trace elements in the soil is reduced, and it is easy to cause the "deficiency disease" of fruit trees, so that the disease resistance and stress resistance of fruit trees can be reduced. In addition, due to the characteristics of glyphosate 'cutting grass and removing roots', long-term use in mountain areas is likely to cause soil erosion and even debris flow, especially on the slopes of the Three Gorges mountain area of the Yangtze River. "

What is more noteworthy in the fruit tree area is that the half-life and residual period of glyphosate are very long, and excessive use can easily lead to soil residue, causing hidden drug damage and next crop drug damage. In addition, it has a strong internal absorption. If there is mistakenly spraying or drifting during weeding, it will cause serious damage to the root system of fruit trees, and then cause hidden drug damage such as yellowing, fruit dropping and defoliation of fruit trees.

What is used for weeding in orchards

Artificial weeding is too expensive, and weeds compete with navel oranges for nutrition and have to be weeded. Xiong Xingping said: "after paraquat was withdrawn from the market, orchard weeding has entered the era of glyphosate.".

Compared with glyphosate, glyphosate has multiple advantages as a new generation herbicide: first, glyphosate is a non-conductive contact herbicide with poor internal absorption effect; Second, glyphosate is easy to degrade and has a short residual period, which is safe for subsequent crops; Third, glyphosate has a faster weeding speed, and the effect can be seen in about 3 days, and the effective period is long; Fourth, glyphosate has a better control effect on weeds resistant to glyphosate, such as milkweed and Petunia; Fifthly, after entering the soil, glyphosate will be degraded by microorganisms. Dead grass can effectively improve the fertility of the soil without causing symptoms such as lack of nutrients.