What kind of fertilizer do you need for top dressing in rape?

Rapeseed topdressing mainly chases nitrogen, potassium, boron fertilizer, and nitrogen fertilizer.

Urea is an option.

Potassium fertilizer is potassium chloride.

Boron fertilizer can be borax or boric acid. Generally, 5-6 kg of urea is chased at the seedling stage (about 5 leaf stage) to promote the growth of seedlings and form strong seedlings for wintering, and a small amount of potassium fertilizer can also be added; Jiangxi, Hunan and other areas generally apply good fertilizer before the Spring Festival, apply 5-6 kg of urea and 5-7 kg of potassium chloride to ensure that there are sufficient nutrients for branch growth and podding during the key growth period of rape.

Boron fertilizer should be applied basally, combined with foliar spraying, and borax solution should be sprayed on the foliar surface during the flowering stage of rapeseed buds. If the base fertilizer is not sprinkled with boron fertilizer, it can be sprayed 2-3 times during the growth period of rape (seedling stage, bud flowering stage) to prevent rapeseed from "flowering but not fruiting". Boron fertilizer can be sprayed at the same time as the flowering stage of rape buds, and potassium dihydrogen phosphate can be added at the same time.

Combined with the prevention and control of sclerotinia and downy mildew.

and other agents together, it can improve the fullness of rape pods.

At present, the effect of rapeseed special slow-release fertilizer is good, and one-time fertilization can be managed for one season, which can save the labor cost of fertilization.

When rapeseed is seeded, 35-45 kg of slow-release fertilizer can be applied at one time, and if the growth is weak in the later stage of rapeseed growth (from sprouting to flowering), due to appropriate topdressing or foliar spraying, if the growth is good, there is no need for topdressing.

You can use organic fertilizer throughout the growth process, powdered is good, and you can use 500-1500 kg per mu according to soil fertility.

Hello, the vigorous development of rapeseed seedlings is the basis for high and stable yield. It is necessary to make full use of the heat before winter to promote autumn and winter hair. After transplanting rapeseed 7 to 10 days after planting, water-soluble fertilizer is applied to it, and urea or human manure can be applied per mu.

The bottom application of boron fertilizer per mu can be mixed with other nitrogen and phosphorus water-soluble fertilizers and applied to the seedbed or direct seeding rape field. Generally, it is advisable to apply it to the upper layer of soil. The amount of bottom application can be determined according to the amount of available boron content in the soil.

Soil available boron is 0For boron suitable areas above 5mg kg, 05kg borax; Kg of borax can be applied at the bottom of the boron-deficient area containing mg kg; In severe boron-deficient areas containing less than mg kg, the application rate of boron fertilizer should be 1kg.

Nutritional properties of oilseed rape.

1. Nitrogen: the absorption of nitrogen at the seedling stage accounts for 45% of the total absorption, the seedling stage is the critical period of nitrogen nutrition, and the vegetative growth and reproductive growth of the budding stage are very vigorous, which is the period when rape needs more nitrogen.

2. Phosphorus: rape is sensitive to phosphorus in the early stage of growth, and phosphorus can be reused in the crop, so rape flowering to maturity stage is the period when rape absorbs more phosphorus, accounting for more than 50% of the whole growth period, and 60-70% of phosphorus is distributed in the grain after maturity.

3. Potassium: Rapeseed has a great demand for potassium, and the potassium concentration in the plant at the stage of sprouting is high, so it must be applied before sprouting, and the earlier the application, the better the effect.

4. Boron: Boron has a great impact on the root development of rapeseed, flowering, pollination and seed setting, and the seedling stage, sprout stage and flowering stage are the key periods for rape to need boron.

What is the best fertilizer for rapeseed? The best fertilizer for rapeseed is compound fertilizer, because compound fertilizer contains nitrogen, phosphorus and potassium, nutrients needed by a variety of plants, so it is very suitable for rapeseed.

If you grow rapeseed, it is best to eat some compound fertilizers, and then there are phosphorus fertilizers, nitrogen fertilizers and potassium fertilizers are the best.

Fertilization at the seedling stage of rapeseedNitrogen fertilizer should be the main fertilizer, and phosphorus and potassium fertilizer should be appropriately supplemented if the base fertilizer is insufficient.

1. How to fertilize rape seedlings?

Early application and frequent application of seedling fertilizer, timely ** nutrients required for rapeseed seedling stage, use the short period of high temperature before winter, promote the growth of rapeseed, achieve strong seedlings overwintering, and lay the foundation for high and stable yield of rapeseed.

Seedling fertilizer and cocoa are divided into two top dressing in the early and late seedling stages. Pre-seedling fertilizer is applied when the seedlings are set or 5 true leaves, generally 5-6 kg of urea per mu, in the soil lacking phosphorus and potassium, if the base fertilizer is not applied phosphorus and potassium fertilizer, the potassium dihydrogen phosphate can be supplemented;

Top dressing in the late seedling stage should depend on the seedling condition and climate. Generally, 8-10 kg of high-nitrogen compound fertilizer is applied per mu. Varieties with strong spring or areas with warm winter should be applied early, and late application can be applied in areas with low temperature or three crops in winter.

Second, how to top dressing rape

1. Steady application of sprout fertilizer.

Rapeseed sprout stage is the period of vegetative growth and reproductive growth at the same time, the plant rapidly pulls sprouts, grows branches, increases the leaf area, and differentiates a large number of flower buds, which is the period when more fertilizer is needed, and it is also the critical period of increasing branches and pods.

According to the application of base fertilizer and seedling fertilizer and growth, the fertilizer should be applied stably as appropriate. Base and seedling fertilizer is sufficient, the plant grows robustly, and can be applied less or no sprout fertilizer; If the base and seedling fertilizer are insufficient, the fertilizer should be applied as soon as possible if there is a tendency to defertilize.

2. Skillful application of flower fertilizer.

The number and weight of seeds are closely related to the nutritional conditions after flowering. For vigorous growth, the amount of fertilizer at the sprout stage can be not applied or less; No application for early-maturing varieties, or less application at the first flowering stage; Top dressing during flowering can be applied as a foliar spray, with urea or potassium dihydrogen phosphate sprayed at the flowering and pod-setting stage.

Borax aqueous solution can be sprayed once in the late seedling stage and the budding stage to prevent the phenomenon of "flower but not fruit" and improve the yield.

Rapeseed has strong adaptability to soil, but prefers loose, fertile, high organic matter content, and strong water and fertilizer retention. The absorption of nitrogen, phosphorus and potassium by rapeseed is greater than that of nitrogen and greater than that of potassium. For every 1000 kg of rapeseed produced, it needs to absorb kilograms of pure nitrogen, phosphorus (P2O5) kilograms, and potassium (K2O) kilograms.

Deficiencies in the trace element boron can cause boron deficiency. Individual plants absorb less nutrients; However, it reaches tens of thousands of plants per mu, so the plants in the group per unit area absorb more nutrients. The nutrient demand of rape is synchronized with the growth of plants, and the growth of plants in the early stage of growth is small, and the absorption of nutrients is also small. When the plant enters the vigorous growth period, the uptake of nutrients increases.

This period, especially nitrogen, is related to the yield and quality of rapeseed, if the nitrogen is insufficient, the leaves become smaller, yellow, and the eating rate is low, therefore, in the facility cultivation to increase the application of basal fertilizer, improve the soil environmental conditions, conducive to root absorption, timely topdressing of nitrogen and potassium fertilizer, transplantation of slow seedlings after topdressing a small amount of nitrogen fertilizer, into the vigorous growth period, the amount of available nitrogen and potassium fertilizer topdressing should be increased, phosphate fertilizer for basal fertilizer.

The growth period of rape is short, top dressing 1 2 times can be, 7 10 days after planting, top dressing slow seedling fertilizer, top dressing 5 10 kg of urea per mu, or 10 20 kg of ammonium sulfate. The second top dressing was carried out in the vigorous growth period of rapeseed, and 10 15 kg of urea, or 20 30 kg of ammonium sulfate, and 10 kg of potassium chloride were applied per mu. If the soil is deficient in boron, the borax solution should be sprayed in time to prevent the occurrence of boron deficiency symptoms in rapeseed.

Rapeseed fertilization to dedicateCompound fertilizerThe effect is better.

1. When ploughing the field, the whole field is sprinkled with compound microbial ecological fertilizer (containing organic matter and humic acid.

Chelation of trace elements.

and beneficial microorganisms), which can not only increase the content of soil organic matter, but also improve soil permeability. After making the box and taking the ridge, the rape seeds are seeded live.

2. After the rape seedlings emerge and the seedlings are interspersed, the microbial agent plus chlorine-based compound fertilizer (the recommended ratio is 23-10-15) is mixed with water to water the roots of the rape seedlings as seedling fertilizer;

3. When overwintering, use chlorine-based compound fertilizer (the recommended ratio is 19-9-18) as wax fertilizer, and spread it all over the field;

Fourth, in order to improve the cold resistance of rapeseed, combined with aphids and cabbage insects.

, polyenergetic tiger amino acids can be used.

Foliar spray of Chinese herbal medicine nutrient solution for 1 time;

5. At the beginning of spring, when rape begins to draw moss, combine with disease and insect control and flowers but not fruit, and then use Chinese herbal medicine nutrient solution for foliar spray 1-2 times.

Characteristics of rapeseed fertilizer requirements:

1) The demand for nitrogen, phosphorus and potassium is large to produce 100 kg of rapeseed.

Kilograms of nitrogen, kilograms of phosphorus, kilograms of potassium are required. At a certain level of production, the production of the same weight of product, rape requires 3-5 times more nitrogen, phosphorus and potassium than rice, wheat and corn.

2) There were two peak periods for nitrogen uptake due to the different requirements for nitrogen, phosphorus and potassium at different growth stages of rapeseed, namely seedling stage and sprout stage. The potassium uptake at the rape stage accounts for about half of the whole growth period, and the potassium deficiency in the early stage is deficient.

It can lead to dead seedlings or severe yield reduction, so sufficient nitrogen and potassium nutrition before the flowering stage of rape is the key to high yield.

3) Rapeseed is particularly sensitive to phosphorus and boron fertilizers, and if the available phosphorus content in the soil is less than 5 mg kg, rapeseed will have obvious phosphorus deficiency symptoms, and phosphorus deficiency will have a serious impact on yield at any stage of growth. The demand for available boron in the soil is about 5 times higher than that of other crops, and special attention should be paid to the application of boron fertilizer in production.

When flowering and poding, when the soil is deficient in potassium, spray once at the first flowering stage, and do not shade. Rape Honda boron. The root system of rape has a strong ability to absorb phosphorus.

The amount of phosphate fertilizer is generally 20-30 kg of superphosphate or calcium-magnesium phosphate fertilizer per mu, but the reaction is sensitive, potassium 8, rapeseed base fertilizer is divided into bottom fertilizer and seed fertilizer, generally with rotting human manure and available phosphorus and potassium fertilizer, in rape sowing or transplanting concentrated in the row or hole, so as to avoid poisoning, the effect is good. 5-10, boron deficiency will be "flower but not fruit".1 kg, need more fertilizer, and the effect of potassium fertilizer alone is lower, grain weight is related to the later nutritional conditions, rape growth is poor, 5-10 kg of potassium chloride per mu, fruit increase effect is great, with rotting human and animal manure and urine for seedling fertilizer, sprout stage, can be sprayed with 1% urea or superphosphate or potassium dihydrogen phosphate.

Leafy vegetables generally use compound fertilizers, especially compound fertilizers with a balance of nitrogen, phosphorus and potassium, because phosphate fertilizers can promote the growth of plant roots, and potassium fertilizers can promote the development of fruit leaves.

Rapeseed fertilization with special compound fertilizer has a better effect. Rapeseed likes boron and potassium fertilizer, potassium fertilizer is strong, boron fertilizer bears solid horn seeds, in the process of rape planting and growth, it is better to apply boron and potassium fertilizer in a timely and appropriate amount than to apply other fertilizers. How to fertilize rape?

1. Base fertilizer. Rapeseed has a long growth period and a large amount of fertilizer, so sufficient basal fertilizer should be applied. The application of basal fertilizer includes 50% of the total nitrogen fertilizer, as well as all phosphorus, potassium and farm fertilizer. The amount of farmhouse fertilizer depends on the quality of fertilizer, and generally 3-5 tons per mu.

2. Top dressing. (1) At the seedling stage, in order to promote the growth of the root system, 300-500 kg of human manure, 5-7 kg of urea and 10-15 kg of ammonium carbonate should be applied per mu according to the seedling stage.

2) In the winter, generally 3000-4000 kg of soil miscellaneous fertilizer and 20 kg of compound fertilizer should be applied per mu.

3) After the beginning of spring, rape begins to sprout, which is the period of vegetative growth and reproductive growth, and it is also the peak period of fertilizer demand. 5-8 kg of urea should be chased quickly according to the rape seedling conditions, not only to prevent premature aging, but also to prevent excessive growth from causing serious shading, which is easy to induce sclerotinia sclerotinia disease.

Rapeseed and compound fertilizer are planted together, and there is a possibility that the roots will burn, so it is best not to do it together.

Let's learn how to pick and cultivate rapeseed seedlings.

1.Select the variety. The selection of good varieties is the key to high yield of rapeseed, and the required varieties are those with high yield and high quality"Double low", high oil content, etc.), high resistance (lodging resistance, antibacterial resistance to sclerotinia sclerotinia resistance, etc.), such as Zhongshuang 11, Huaza 9, Changza oil and other rapeseed varieties.

2.Choose a seedbed site. Choose dry soil or vegetable garden soil with loose and fertile soil, convenient drainage and irrigation, flat terrain, and no rapeseed planting for more than 2 years. Seedbed area: The ratio of 1:5-6 is the best for field area.

2.Apply adequate base fertilizer. Before sowing, the seedbed should be finely arranged, according to the tons of pig manure, 20 kg of ammonium carbonate, 25 kg of calcium, magnesium and phosphorus fertilizer, and 6 kg of potassium chloride per mu of farmyard fertilizer, mixed and mixed for about 10 days, combined with the seedbed finishing as soil bottom fertilizer.

3.Sowing at the right time. The rape sowing time is in the first half of September, and each mu is mixed and evenly sown according to 1 kg of borax + fire soil ash + rape seed kilograms.

Before sowing, the furrow surface should be kept at a certain humidity, and timely irrigation should be carried out in case of dry weather, otherwise it will greatly affect the emergence rate. After sowing, cover with fire soil ash and spray acetochlor on the surface of the chamber while wet to control the growth of weeds.

4.Timely seedling. After the emergence of seedlings in 1 leaf during the seedling 1 time, 3 leaves before the start of the seedling, to remove the small seedlings, weak seedlings, diseased seedlings, miscellaneous seedlings, to go dense and thin, according to 70 100 m2 seedlings for the best.

After the seedbed is fixed, it is sprayed with about 50 kg of paclobutrazol mixed with water of 30g per mu.

Nitrogen, phosphorus and potassium fertilizers for rapeseed.

Oilseed rape needs to be fertilized with nitrogen, phosphorus and potassium fertilizers. This is a nutrient that oilseed rape must have in the growth process, and when fertilizing, it is necessary to use the strategy of promoting the front and stabilizing. That is, 70% of nitrogen fertilizer, phosphate fertilizer, and potassium fertilizer, after mixing, is used as base fertilizer or seedling fertilizer.

The remaining 30% of nitrogen fertilizer is used during the moss fertilizer period.

Rape fertilization method

1. Base fertilizer.

Because the rape plant is relatively tall, it needs a lot of fertilizer, and at this time it is necessary to pay attention to the base fertilizer. If there is not enough basal fertilizer, the seedlings will grow thinner, and the overall growth of the plant and the future economic yield will be affected.

2. Seedling fertilizer

For seedling fertilizer, it can be divided into two top dressings: early seedling and late seedling. The pre-seedling stage is applied at the seedling setting stage, or when 5 true leaves have grown. If potassium and phosphate fertilizers are not used in the base fertilizer, they should also be supplemented in time.

3. Steady application of sprout fertilizer

This is the period of growth and reproductive growth, so it is necessary to ensure adequate nutrition at this time. When it grows to 15-30 cm, it needs to be fertilized, but the weaker ones can be fertilized in advance to avoid premature aging. Stronger growth can be fertilized at a later stage to avoid crazy flowering.

4. Flower fertilizer

Rapeseed is a kind of crop that sets pods while flowering, and the number and weight of seeds are particularly closely related to the nutritional conditions after flowering. For those with more vigorous growth, you can choose not to apply or to apply less.