When it comes to crop fertilization, I'm afraid farmers know urea and Shenyang compound fertilizer Has. What is urea Compound fertilizer What are the differences?
In brief, urea is a kind of nitrogen fertilizer that is often used. The content of nitrogen element is very high in all fertilizer categories, so it is more suitable for growing crops that need more nitrogen fertilizer. From the academic point of view of the fertilizer industry, urea, also known as carbamide, is a kind of carbon hydrogen oxygen organic compound, which is white crystal, suitable for all kinds of soil and crops, and has a large amount of consumption every year.
There are three main differences
Urea and compound fertilizer are two different types of fertilizers, the main differences are as follows:
1. Nutrient elements are different. The main element of urea is nitrogen, while the compound fertilizer contains many elements, and only two or more types of elements are formed, such as nitrogen, phosphorus, potassium or other trace elements, most of which are macroelements.
2. Different functions. Urea is mostly used for topdressing. For example, topdressing urea when maize seedlings grow to the knee is conducive to the growth of elongation. Compound fertilizer can be used not only as base fertilizer but also as top dressing, but also as base fertilizer. Although compound fertilizer is also suitable for topdressing, it is mostly replaced by water-soluble fertilizer because the absorption rate of these water-soluble fertilizers is faster than that of compound fertilizer.
3. Different usages. Urea is dissolved in some growers' hands by grinding, crushing, mixing with water, and is used for foliar spraying to supplement nitrogen. It can also be used for root digging, covering soil and fertilizing, while compound fertilizer can only be dug and buried around crop roots to provide nutrients.
Pay attention to three points when applying fertilizer
Note 1: dosage. The amount of urea per mu of land is 5-15kg, and 15-20kg for paddy fields. For example, the concentration of foliar spraying on fruit trees is limited to 0.5% - 1.5%. Compound fertilizer is used as base fertilizer, and the amount per mu is 30-40 kg.
Note 2: mixing. Compound fertilizer and urea should be used separately, and it is not recommended to mix them into the soil, which will easily lead to excess nitrogen. Because compound fertilizer contains various elements, including nitrogen. In addition, urea cannot be applied together with other alkaline fertilizers such as plant ash and calcium magnesium phosphate fertilizer.
Third, it is suitable for crops. Although celery needs a lot of nitrogen fertilizer during its growth, urea cannot be used as top dressing for celery. It is easy for celery to age by using urea to supplement nitrogen, and it grows slowly and tastes bad.
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