In the current winter leisure period, many growers are choosing fertilizer. Wheat to the rejuvenation period also need to be fertilized again, the types of fertilizer are compound fertilizer or urea, these two are used more.
Some farmers asked, is it good to use 3 15 compound fertilizers for wheat topdressing, and use 40 or 50 catties per mu?
I asked the farmer what fertilizer to use for the bottom fertilizer? Farmers say that it is also 3 15 balanced fertilizers, with a dosage of 120 catties per mu. This farmer is going to use a recipe to manage to the end.
3 15 compound fertilizers, that is, 15 nitrogen, phosphorus and potassium, have comprehensive nutrients, and many farmers believe that there is no mistake in using this fertilizer when topdressing. According to the fertilization situation of this farmer, it is not recommended to use 3 15 compound fertilizers as topdressing for wheat rejuvenation for two reasons:
First, compound fertilizer has been used in the bottom fertilizer, while the wheat seedling stage requires less phosphorus and potassium, and more phosphorus and potassium are needed from the jointing to the gestational ear stage, which can meet the growth needs of the later stage. In general, sufficient phosphorus and potassium are required in the bottom fertilizer, and the later topdressing is mainly nitrogen fertilizer.
Second, the wheat rejuvenation period is topdressed, and the use of balanced fertilizer is not very scientific. Wheat from the jointing to the filling stage, the demand for nitrogen, phosphorus and potassium is different, the use of 3 15 compound fertilizer topdressing, phosphorus and potassium excess, but increased fertilizer costs, increased yield is not obvious. After the bottom fertilizer is applied, after the wheat returns to green, only the topdressing nitrogen fertilizer can be used.
What fertilizer should be used during the rejuvenation period of wheat, it is best to choose by combining the bottom fertilizer and the growth of wheat seedlings. If compound fertilizer has been used in the bottom fertilizer, and the wheat seedlings are growing well. In the wheat rejuvenation period, topdressing can be used with urea 30 to 40 catties per mu and potassium fertilizer 5 to 10 catties. There is no need to use compound fertilizer, and when it comes to the gestational spike and grouting stage, when there is a lack of phosphorus, potassium dihydrogen phosphate can be supplemented by foliar spraying, which plays the role of phosphorus supplementation and potassium supplementation.
When applying bottom fertilizer, some farmers only use diammonium phosphate, and when topdressing during the rejuvenation period, it is not recommended to use 3 15 compound fertilizers. Generally, thirty or forty pounds of diammonium are used in the bottom fertilizer, and the phosphorus element is sufficient to meet the growth needs of wheat, and the fertilizer containing phosphorus is wasted when topdressing. When the wheat is topdressed during the rejuvenation period, the use of nitrogen fertilizer and potassium fertilizer should be reapplied, and urea can be added to potassium chloride, and high nitrogen and high potassium compound fertilizer can also be used.
For wheat plots that use only urea in the bottom fertilizer, it is best to use compound fertilizer containing nitrogen, phosphorus and potassium when topdressing, and the earlier it is applied, the better. For example, with 3 15 balanced fertilizers, 30 to 40 catties per acre, phosphorus and potassium elements should be applied at one time to meet the growth needs of wheat after jointing.
This is from the combination of the use of the bottom fertilizer, to determine what fertilizer to use, when the phosphorus and potassium content in the bottom fertilizer is sufficient, the topdressing can only use urea. Specifically, it should be determined according to the growth of wheat seedlings and soil fertility. Some plots themselves have high soil fertility and sufficient phosphorus and potassium to apply only urea.