How much fertilizer per mu for corn, and which fertilizer is best?

Corn is one of the famous five grains in China, and it is currently grown in both the north and south of the country. In recent years, more and more people have chosen to grow corn, but when growing corn, fertilization is very important. Both the amount of fertilizer applied and the type of fertilizer chosen involve some techniques that need to be mastered. Let us learn about them together below!

How much fertilizer per mu for corn

1. For fields with a yield level above 800 kg/mu, the recommended rates are 16-18 kg/mu of nitrogen fertilizer, 6-8 kg of phosphate fertilizer, 5-8 kg/mu of potassium fertilizer, 1-2 kg/mu of zinc sulfate, and 0.5 kg/mu of borax.

2. For fields with a yield level of 600-800 kg/mu, the recommended rates are 14-16 kg/mu of nitrogen fertilizer, 4-6 kg of phosphate fertilizer, 4-7 kg/mu of potassium fertilizer, 1-2 kg/mu of zinc sulfate, and 0.5 kg/mu of borax.

3. For fields with a yield level of 400-600 kg/mu, the recommended rates are 12-14 kg/mu of nitrogen fertilizer, 3-5 kg of phosphate fertilizer, 1-5 kg/mu of potassium fertilizer, 1 kg/mu of zinc sulfate, and 0.5 kg/mu of borax.

4. For fields with a yield level below 400 kg/mu, the recommended rates are 10-12 kg/mu of nitrogen fertilizer, 2-3 kg of phosphate fertilizer, 1-3 kg/mu of potassium fertilizer, and 0.5 kg/mu of borax.

What fertilizer is best for corn

1. Throughout the entire growth cycle, corn has the greatest demand for nitrogen, followed by potassium, then phosphorus, and it also needs a moderate supply of mineral elements. When the nitrogen-phosphorus-potassium ratio is around 1:0.49:0.9, the growth is better and the yield is higher. For base fertilizer, it is generally suitable to apply 3000 kg of organic fertilizer, all of the phosphorus and potassium fertilizer, and 1/3 of the nitrogen fertilizer.

2. Corn seedlings have underdeveloped root systems and a weak ability to absorb nutrients, so fertilizers containing quick-acting nutrients should be selected as seed fertilizer. Decomposed farmyard manure can also be applied at the same time as seed fertilizer. Generally, about 6 kg of ammonium sulfate per mu or 500 kg of decomposed farmyard manure can be applied, with an appropriate amount of phosphorus and potassium fertilizer added as suitable. The large trumpet stage of corn is the period of greatest fertilizer demand, and the absorption rate is also relatively fast, so quick-acting fertilizers with a relatively high nitrogen content can be selected and applied.

How to fertilize corn at each stage

1. Base fertilizer: Base fertilizer is mainly applied by combining slow-release fertilizer with quick-acting fertilizer. Slow-release fertilizer refers to farmyard manure, and quick-acting fertilizer refers to calcium superphosphate, urea, potassium fertilizer and zinc fertilizer. 1000-1500 kg of organic fertilizer, 30 kg of calcium superphosphate, 6 kg of urea and 2 kg of zinc fertilizer are applied all at once as base fertilizer.

2. Seedling fertilizer: When the leaves have 6-7 leaves, apply 10 kg of urea in a ring around the corn plants. When applying, the urea should be 3-4 cm away from the plants and must not be applied directly on the plants. The best time to fertilize is after rainy days. If the weather is too dry, it is best to water a little after topdressing.

3. Jointing fertilizer: Jointing fertilizer is generally applied two months after sowing. At this time, the number of corn leaves is generally 11-12. Apply 24 kg of urea and 10 kg of potassium fertilizer all at once. The fertilization method is the same as for seedling fertilizer and should be applied in a ring; when necessary, add some fertilizer water.

Precautions for topdressing corn

1. Topdress according to the soil. Topdressing should be determined by the nature of the soil. For low-lying land and alkaline land, acidic or physiologically acidic fertilizers such as ammonium nitrate, ammonium sulfate and calcium superphosphate should be selected for topdressing. For acidic soil, alkaline fertilizers such as urea and ammonium bicarbonate should be selected for topdressing. For sandy loam soil with poor water and fertilizer retention capacity, ammonium nitrate or urea, which are not easily volatilized, should be selected for topdressing.

2. Topdress according to the stage. Do not topdress too early at the seedling stage, so as to facilitate the corn seedlings growing thick and strong. During the formation stage of tassels and ears, topdressing should not be too late, to prevent fertilizer deficiency and premature aging. Later topdressing should be timely and appropriate, to prevent excessive vegetative growth and late maturity.

3. Topdress according to the growth condition. Due to differences in soil quality, fertilizer and water conservancy conditions, although the same variety is sown at the same time, the growth conditions vary. There are plots with strong seedlings and plots with weak seedlings, and even within the same plot the growth of corn differs. Therefore, topdressing should be differentiated. The specific method is: for plots with strong seedlings, apply chemical fertilizer as topdressing; for plots with weak seedlings, in addition to chemical fertilizer, also apply decomposed human manure and cake fertilizer as topdressing; for weak seedlings in plots with strong seedlings, they should be given special treatment and more topdressing, so that the weak seedlings quickly recover and become strong. After topdressing, cultivate the soil in time.

After reading the introduction above about corn fertilization, everyone must have a deeper understanding of corn fertilization. There are many fertilizers that can be selected for corn, and the amount of fertilizer applied at different stages is also different. If corn needs topdressing, it can be judged from its soil and other aspects.