When is the best time for topdressing corn? What kind of fertilizer is the best to topdressing?

The growth of any crop is inseparable from fertilizer, and corn fertilization is no exception, so when will corn fertilization be effective? The best time to fertilize corn? Then answer these questions for you.

The best time to fertilize corn:

Attack stalk fat. Generally 6-8 leaves, seedling height of 30 cm topdressing. Attacking stalk fertilizer can promote the enlargement of the upper leaves of maize, expand the photosynthetic area, prolong the functional period of the lower leaves, and lay a good foundation for promoting roots, strong stalks and increasing ears.

Attack spike fat. In the big trumpet stage of corn, that is, 10-15 days before heading, topdressing with 12-13 leaves. This stage is the most vigorous period for the growth and development of maize, which requires a lot of fertilizer and water, and is the key period to determine the ear size and the number of grains per ear. At this time, re-application of panicle fertilizer and simultaneous attack of fertilizer and water can not only meet the needs of fertilizer and water for panicle differentiation, but also improve the photosynthetic productivity of the middle and upper leaves, so that the input ear has more nutrients, more grains and fullness, which has a significant effect on increasing yield.

Attack grain fertilizer. Refers to the female ear filaments began to pull out, before and after pollination of a topdressing. The main purpose is to prevent late de-fertilization, prolong the functional period of upper leaves, promote grain filling, increase grain weight and increase yield.

Maize topdressing should be based on soil fertility, characteristics of variety fertilizer requirement and variety growth period, so as to meet the needs of maize growth and development. some of them can be applied once in the big trumpet stage, or twice in the jointing and trumpet stage. But it is necessary to chase less in the first time and more in the latter. Whether to pursue grain fertilizer or not depends on the state of soil fertility. In the later stage, the soil that is easy to take off fertilizer can chase less grain-attacking fertilizer, so as to avoid excessive topdressing and late ripening, resulting in a reduction in yield.

Related questions and answers

1. It's too late to get fat. Usually wait until after the male to get fat.

2. One-shot topdressing. That is, no matter what kind of fertilizer, all mixed together, as a kind of fertilizer.

3. Look at the sky to get fat. If you don't wait for the rain, you will not be fertilized, not according to the growth of corn.

In the above three cases, I believe that many friends have done it. In fact, corn topdressing has a great impact on the late yield. At present, in the spring corn planting area, corn is about to be or is being topdressing. The small helper aims at the specific problems encountered in production. Let's talk about it.

Q: what is the law of fertilizer demand for corn?

A: the seedling stage of corn is the key period for phosphorus and potassium fertilizer, and the trumpet stage before heading is the key period for nitrogen fertilizer.

Q: when is the best time for corn topdressing?

A: the loudspeaker period is the best time for topdressing.

Q: what kind of fat is better to pursue?

A: high nitrogen and low phosphorus in potassium or high nitrogen, low phosphorus and low potassium are fine. In the actual production, urea can be used with some potash fertilizer and phosphate fertilizer.

Q: how many times do you need to chase?

A: under normal circumstances, one will do, and if the land is particularly deficient in elements, it can be pursued many times according to the specific situation.

Q: how to have a high utilization rate of topdressing?

Answer: if the planting area is small, you can use artificial planing pit deep application, directly act on the roots of corn, and then cover the soil; if the planting area is large, you can dig ridges and top fertilizer, spread it in the ridges and ditches, and then cover the soil, pay attention here, do not spread it directly on the ground, causing serious waste.

Q: how much per mu is better?

Answer: according to soil fertility, variety fertilizer characteristics, variety growth period and other appropriate amount of topdressing. Take urea as an example:

High fertility plots, urea consumption of 15-17 kg / mu

Medium fertility plot, urea consumption is 18-20 kg / mu

In the low fertility plot, the amount of urea is 21-23 kg / mu.

In view of the problem of corn topdressing, the small helper is reminding that topdressing is not recommended in the case of drought, but better before the rain. At the same time, for greedy green and late-maturing plots, it is necessary to increase the application of phosphorus and potassium fertilizer to promote corn ripening as soon as possible.