The top dressing should be targeted, and it should be sprayed according to the shortage of soil fertilizer and the growth of crops. If the seedlings are thin and yellow, indicating that nitrogen deficiency should be based on nitrogen spray; if the seedlings are in general, they should be sprayed with nitrogen and phosphorus; if the seedlings are green, they should be sprayed with phosphorus and potassium. ;
The top dressing should be sprayed in the critical period of crop fertilizer. Different crops need different fertilizers for different fertilizers. It should be flexibly mastered. Generally, wheat is sprayed after the heading, soybean, peanut and rape are in the beginning and full bloom period. Spraying separately, corn and sorghum should be sprayed during the filling period, and sweet potato and potato should be sprayed during the fruit expansion period.
The amount of top dressing should be sufficient. Generally, the amount of fertilizer used per acre is 50-60 kg. Spray 2-3 times continuously, 7-10 days at a time.
The top dressing should be careful not to spray at high temperatures. In the cloudy days without wind, it can be sprayed all day. Sunny days should be sprayed before 10 am and after 5 pm. In addition, a small amount of active agent (such as neutral soap, washing powder) can be added during spraying to reduce the surface tension of the fertilizer solution, which is beneficial to the leafing and absorption of the fertilizer solution, and can improve the spraying effect.
Huaxian County Shang Hongyan
The top dressing should be sprayed in the critical period of crop fertilizer. Different crops need different fertilizers for different fertilizers. It should be flexibly mastered. Generally, wheat is sprayed after the heading, soybean, peanut and rape are in the beginning and full bloom period. Spraying separately, corn and sorghum should be sprayed during the filling period, and sweet potato and potato should be sprayed during the fruit expansion period.
The amount of top dressing should be sufficient. Generally, the amount of fertilizer used per acre is 50-60 kg. Spray 2-3 times continuously, 7-10 days at a time.
The top dressing should be careful not to spray at high temperatures. In the cloudy days without wind, it can be sprayed all day. Sunny days should be sprayed before 10 am and after 5 pm. In addition, a small amount of active agent (such as neutral soap, washing powder) can be added during spraying to reduce the surface tension of the fertilizer solution, which is beneficial to the leafing and absorption of the fertilizer solution, and can improve the spraying effect.
Huaxian County Shang Hongyan
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