The sales price of urea is relatively high. Farmers' friends should follow the technical points of ten aspects in the application of urea, so as to save cost and exert the fertilizer effect of urea.
First, consider the main crops first. Crops with large abundance and high economic value (such as wheat and corn) should be considered when applying, and for secondary crops such as buckwheat, they can be appropriately applied or not applied according to their own economic conditions. The land exerts the effect of increasing the yield of fertilizer.
Second, as a base fertilizer or top dressing. Urea is suitable for use as a base fertilizer and top dressing. Under normal circumstances, it is not used as a seed fertilizer. Because urea easily destroys the structure of the protein, denatures the protein, affects the germination of the seed and the growth of the roots of the seedlings, and in severe cases, the seed loses its ability to germinate.
Third, used as autumn fertilizer. For dry land, urea is more effective than spring application. According to relevant tests, under the same conditions, autumn application can increase the utilization rate of urea in the season by more than 10.8%. If urea is applied, it will be better with organic fertilizer and other fertilizers.
Fourth, used as a top dressing. Urea is an amide fertilizer, which is organic, neutral, and contains no by-components. It has little burn on the stems and leaves of crops. The urea molecules are small in volume and easy to enter the cells through the cell membrane. The urea itself is hygroscopic and easily absorbed by the leaves. When the leaves penetrate, the separation of the walls is less, and even if it occurs, it will recover quickly. Therefore, urea as a root dressing is better than other nitrogen fertilizers. The concentration and time of urea sprayed outside the root vary with crop type. Under normal circumstances, each application of urea per acre is 0.5-2.5 kg; once every 4-5 days, 2-3 times.
Fifth, pursue in advance. After the urea is applied to the soil, it is hydrolyzed to ammonium bicarbonate by the action of soil microorganisms before being absorbed by the roots of the crop. Therefore, it should be pursued in advance.
Sixth, deep application of soil. The final product of urea decomposition in soil is ammonium carbonate. Ammonium carbonate is very unstable. It decomposes in the soil or on the soil surface to form free ammonia, which is volatile and volatile. Therefore, when applying urea, the soil should be applied deeply, and the depth of covering soil is generally about 10 cm.
Seven, try to apply after rain. Urea has good moisture absorption performance. When performing topdressing in dry land, it should be arranged as much as possible after rain, so that the fertilizer can be dissolved quickly and adsorbed by the soil. At the same time, some fertilizer can be absorbed through the leaves to improve fertilizer efficiency and reduce losses.
8. Apply in the morning or evening. Urea, like other nitrogen fertilizers, should be applied in the morning or evening, preferably after rain or on a cloudy day. Avoid applying it at high temperatures on sunny days (or at noon).
9. Cooperate with other chemical fertilizers. Urea is a unit fertilizer, which should be used in combination with phosphate fertilizer or other chemical fertilizers, so as to meet the needs of crops for various nutrients, and also to play a role in assisting fertilizers.
Ten, combined with organic fertilizer application. The combination of urea and organic fertilizer is an effective measure to improve the efficiency of urea. It can make up for shortcomings, improve the efficiency of fertilizers, save fertilizer, promote microbial activities, improve crop nutrition conditions, reduce production costs, increase production, increase income, etc. Thereby improving the economic benefits of fertilizer. Farmhouse manure is best with high quality pig manure. Under normal circumstances, the ratio of urea to pig manure is 1:1.9.
Ten points of urea application
At present, the annual utilization rate of fertilizer in China is only 30%, of which the utilization rate of nitrogen fertilizer is generally 30%-50%, the utilization rate of phosphate fertilizer is generally 10%-15%, and the utilization rate of potassium fertilizer is generally 40%-70%. Obviously, effectively increasing the utilization rate of fertilizers is crucial to reducing production costs and increasing production and income. Let's take a look at the soil and fertilizer experts to explain the scientific application of fertilizer.
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