Can you grow corn without pesticides? How to choose fertilizer?

Planting corn requires the use of pesticides. If weeds in the field are cleared without using herbicides, the roots of weeds will absorb most of the nutrients, leading to poor growth of corn.

Because of the short growth cycle of maize, fertilization is very important to obtain high yield.

At the seedling stage of maize, the ability to absorb nutrients is weak. Planting fertilizer should be nutritious, and farmyard manure can also be used at the same time. Corn needs more fertilizer at the big bell mouth stage, and its absorption speed is faster, so fertilizer with high nitrogen content can be selected.

Data expansion:

First, how to use corn seed fertilizer?

1. Seed agent: select humic acid, biological fertilizer, micro-fertilizer and other dissolved fertilizers, spray them on corn seeds, stir them while spraying, so that the fertilizer solution adheres to the surface of the seeds evenly, and sow them after drying in the shade.

2. Seed soaking: Dissolve the fertilizer to a certain concentration, soak the seeds in the solution for 12 hours, dry in the shade and sow.

3. Drill sowing or hole sowing: It is suitable to apply chemical fertilizer to drill sowing or hole sowing, and the dosage is 2-5 kg, but the chemical fertilizer must be applied separately from the seeds. The effect of deep fertilization is good, and the suitable fertilization depth is 10- 15cm. Urea, ammonium bicarbonate, ammonium chloride and potassium chloride shall not be used as seed fertilizers.

Second, corn fertilization methods.

In the three stages of corn growth, the proportion of fertilizer needed is different. Seedling stage accounts for 2% of the total fertilizer requirement, ear stage accounts for 85%, and grain stage accounts for 13%. The peak demand of maize fertilization is from jointing stage to big trumpet stage. Fertilization should be reasonable, that is, the combination of base fertilizer, seed fertilizer and topdressing; Combined application of nitrogen, phosphorus and potassium fertilizer; Combination of agricultural fertilizer, chemical fertilizer and biological bacterial fertilizer.

Third, corn topdressing.

The first way is to chase ahead and chase behind. Topdressing combined with field application; Second, dig a hole with a pick to a depth of 15cm or more; Top dressing should be combined with chemical fertilizer and biological fertilizer to promote root development. Generally speaking, topdressing urea 10 ~ 15 kg per mu and adding biological bacterial fertilizer 1kg can promote the early maturity of maize.

Spraying 0.25 kg of potassium dihydrogen phosphate and 0.5 kg of urea with 50 kg of water on leaves at heading and filling stage can prevent baldness and grain loss, increase yield and improve quality. For organic food corn, chemical fertilizer shall not be used.

Four, corn topdressing matters needing attention:

1. Reasonably determine the topdressing time. If fertilization is divided into three times, it is not appropriate to apply fertilizer too early at seedling stage, and it is appropriate to use 5-6 leaves to facilitate the dwarf seedlings to have thick hair; Jointing fertilizer is generally suitable for 10- 1 1 leaf, which can be mechanized in advance to avoid the damage of agricultural machinery to seedlings. The suitable depth is 5- 10cm, which needs to be covered in time.

2. For plots with uneven seedling conditions, strong seedlings and weak seedlings should be treated differently when topdressing. Weak seedlings should be properly topdressing as soon as possible, and foliar fertilizer can be sprayed separately when necessary to promote the early growth and rapid growth of weak seedlings; The topdressing time of strong seedlings should be appropriately postponed.

3. When the potassium content of base fertilizer is insufficient, appropriate amount of potassium fertilizer can be applied to make up for the deficiency of potassium.