Selection of corn field herbicides
In chemical weeding in corn fields, the period of use is divided into three stages: pre-emergence closure treatment, post-emergence stem and leaf treatment, and corn interline treatment. The herbicides used in these three periods were: pre-emergence hereditary herbicide, post-emergence herbicide herbicide, and inter-row herbicide. The closed herbicides were first used in corn fields after wheat harvest. Such herbicides began to be introduced into the market in 1990. By the year 2000, closed herbicides had occupied 50% of the herbicides in the corn field. Such herbicides mainly consisted of ethiacin, acetochlor, and diazepam. Atrazine and so on. Their advantage is that they can be planted and weeded at one time. They are safe and easy to use. However, the effects of weeding are greatly affected by soil moisture and rainfall. In addition, weeds that are excavated or unearthed after paraquat removal are generally used. With perennial weeds, "one kill." In particular, corn fields harvested by the combine harvester have a relatively high wheat stubble, resulting in a poorly closed effect. This is manifested in poor control of volunteer wheat seedlings and some broad-leafed grasses because of the continuous use of acetochlor etc. for many years. Closed herbicides have caused some resistant weed populations to rise. After such closed herbicides are used, they are often subjected to secondary weeding. As a result, more and more farmers are using weeds to treat weeds after waiting for weeds.
At present, the main products of post-emergence stem and leaf treatment agent are Yu Nongle and domestic Nicosulfuron and atrazine. In the mid-1990s, due to price reasons, Yu Nongle had not used much of its area in North China. In the 21st century, nicosulfuron imitation products entered the market. At that time, there was no formal registration of such products. Generally, only atrazine was marked on the product, but the use of the product was often stated as “cannot be used in corn cobsâ€. Because of its low price, when it is used, it can be used as a herbicide, it is not affected by the weather, and the weeding effect is also relatively stable. It is accepted by many farmers. However, in recent years, nicosulfuron herbicides have repeatedly encountered safety problems in the corn fields. First, many dense plant species promoted in large areas such as Zhengdan 958, Denghai series and Yuzi series varieties have been exposed to nicosulfuron. Herbicides are highly sensitive and should not be used. Second, they are often used after 4 leaves of corn. They must be used before the 3rd leaf stage. The technical aspects are often difficult to grasp. Third, weeding should be carried out after the corn 6 leaf stage. Medication or wearing a protective cover to fight drugs, so that farmers feel very inconvenient: Although weeds removed, but the yellow corn leaves, affecting corn yield; Fourth, especially in high temperature or drought conditions, nicosulfuron herbicide often The phytotoxicity of corn has increased, many yellow corn leaves have shrunk, have grown short, and they have lost production because of no spikes, causing many disputes.
Therefore, the selection and promotion of safe, fast herbicide varieties in corn fields is not only an important technical content for achieving food security production, but also a current need for production. In accordance with the requirements of the National Agricultural Technology Extension Service Center and the actual production of corn in our province, we plan to vigorously promote the new post-emergence shoot and leaf treatment technology of “mesotrione deamin (Geng Jie)†newly developed by Swiss Syngenta in 2008. New product. A large number of experiments proved that the post-emergence treatment of the new herbicide stems and leaves of corn safety, strict requirements of the public opinion, rapid availability, and 7 to 14 days after the death of weeds. Specific application techniques and precautions: (1) Before the 3-leaf stage of grass weeds, the broad-leaved weeds were sprayed before the 4-leaf stage; (2) In the summer corn field, mesotrione was used to infiltrate (gengjie) 100 ml. / Mu, plus 0.5% additives. Spring corn field 120 milliliters/mu, plus 0.5% additives; (3) Spray evenly and thoughtfully, without any weight loss, 30 kg per mu of liquid used; (4) The original drug should be formulated into mother liquor, taken The second dilution method shall be formulated as field spraying liquid to ensure the weeding effect; (5) Sweet corn, waxy corn and popcorn shall not be used; (6) Do not mix with organophosphorus pesticides and carbamate pesticides.
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