For late sowing wheat, the soil closure before seeding is more important. If you wait until the emergence of the vaccine, the probability of a large temperature drop is very large, and the temperature range suitable for weeding of stems and leaves is narrow, so it is easy to miss the best medication period, such as the use of isoproterenol and other drugs, the occurrence of "frozen poison" The chances are even greater.
The wheat field is closed to the soil, and some areas are used to medication immediately after sowing. Many years of practice have shown that the appropriate delay in the use of drugs, before the wheat needle, the effect of closed weeding is better. This is because the soil aggregate structure is unstable in the short-term after sowing, and it is easy to be broken. After using the soil sealing treatment agent, a strict soil layer cannot be formed, which will affect the sealing effect.
It is generally recommended to use the medicine just after the wheat has been germinated and not yet unearthed. On the one hand, the soil has been solidified at this time, which is conducive to the formation of a stable soil layer; on the other hand, grass weeds have sprouted and roots, which is beneficial to absorb the drugs in the soil, improve the herbicidal effect, and play a role in joint sealing. At the same time, it can also eliminate some of the broadleaf weeds that emerged before winter. It is recommended to check the germination process of wheat in time to make a more reasonable determination of the time of administration. It is necessary to pay attention to the use of drugs that are safe for the growth of wheat shoots, and to avoid the use of acetochlor-containing agents to prevent burning buds when water is accumulated.
On the basis of selecting a good medicine, the use of sufficient water is beneficial to the formation of a tighter soil layer in the soil, thereby improving the effect of closed weeding and not reducing the amount of water at will. Generally, the water consumption per mu is about 50 kg.
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Natural sweeteners refer to food additives that can sweeten soft drinks. They can be divided into natural sweeteners and synthetic sweeteners according to their sources.
Natural sweeteners are substitutes for sugar. Natural sweeteners considered to be generally safe include stevia, licorice, disodium glycyrrhizinate, tripotassium glycyrrhizinate and trisodium. Natural sweeteners have many uses in the home and in processed foods.
Natural non-nutritive sweeteners are increasingly paid attention to, is the development trend of sweeteners, WHO pointed out that diabetes patients have reached more than 50 million, more than a quarter of the American people require low-calorie food. In sucrose substitutes, the United States mainly uses aspartame, up to more than 90%, Japan mainly uses stevia glycoside, and Europeans are more interested in AK sugar (acesulfames). All three non-nutritive sweeteners are available in China.
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