In the past few days, friends have been asking the same question, which is why wheat seedlings are weak and dead. After a small field visit and collection of data, it was found that, without exception, it was caused by herbicide residues from the crop.
Pictures of such unusual wheat have accumulated a lot in recent years. Especially in the spring of last year, there were field surveys of wheat fields in dozens of counties such as Xingtai, Xingtai, Hengshui, and Zhangzhou, and a large number of pictures were taken, and various possible causes were compared and eliminated one by one. Observing the roots and soil of wheat, eliminating the wheat variety factors (the investigation involves dozens of varieties), eliminating the possibility of root rot, sheath blight, total erosion and other root diseases, asking about fertilization, straw returning, watering In many cases, it was finally determined that it was caused by excessive use of post-emergence herbicides in summer corn. The typical symptoms on the wheat seedlings are consistent with what the friends described: "The wheat seedlings are not long, the heart leaves are twisted, only a few centimeters high, and the normal leaves are also short."
In addition, the investigation also learned that the nicosulfuron-type herbicides applied by farmers on corn, even if they are used normally, should be separated from the post-cultivation wheat for more than three months. However, when the summer corn was sprayed with herbicides in the survey, due to the large number of weeds, the amount of corn herbicide used by farmers after the seedlings was too large, and the amount accumulated in the soil was large. In addition, it is not excluded that some corn seedling herbicides illegally add some "hidden formation points", which aggravates the phytotoxicity of wheat.
In addition, the "Atsujin" (Atrazine) component of the corn post-emergence herbicide added, due to many years of use, the cumulative phytotoxicity also needs to attract everyone's attention.
According to relevant experts, "the two herbicides, chlorsulfuron-methyl and dysentery, are high-efficiency and high-residue herbicides that can only be used in the soybean fields in the spring sowing area. The two ripening areas are not available. When the dosage is large, the second year of spring sowing Corn will also show phytotoxicity. After analysis, it is concluded that: Nicosulfuron has no problem for the lower glutinous wheat, but the compound èŽ æ´¥ æ´¥ 易 易 易 易 易 易 易 易 易 易 易 易 易"
It can be seen from the analysis given by the experts that the herbicide has caused the phenomenon of wheat seedling yellow death reflected by friends. Moreover, it is understood that this phenomenon has already shown an upward trend in production, and it needs to attract the attention of farmers and grassroots agricultural technicians and agricultural resources dealers.
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