Do you want top dressing in winter canola? When exactly is the top dressing?

Traditional rape winter has autumn rains, which are before winter. That is to say, after heavy snowfall, before the winter solstice, the pork and beef rib fertilizer or fertilizer is often scattered between the **, and then mills the mud to become a warm fortress. Because they are all complete fertilizers.

It's different now. Planting no-tillage rice pan rape, there is no pig and beef rib fertilizer, and people use 50 kg of sugar-free ternary compound fertilizer at the same time.

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Reasonable irrigation is an important measure to ensure high yield and stable production of rapeseed. Rapeseed has a long growth time, large vegetative body, lush leaves, many fruiting organs, and large lifelong demand, and the rapeseed production area generally has less rainfall in autumn, winter and spring, and less soil drought, which is not conducive to sowing and seedlings. Northern Regions.

Winter drought aggravates the East China Sea, resulting in dead seedlings. In the southern region, there is a lot of rain in the later period, resulting in staining or flooding losses. Therefore, it is necessary to irrigate in time according to the local conditions according to the characteristics of the water demand of rapeseed.

Raise seedlings frequently, provide the nutrients required for rapeseed seedling stage in time, use the short high temperature in winter to promote the growth of rapeseed, realize strong seedlings overwintering, and lay the foundation for high yield of rapeseed. Seedling fertilizer can be topdressed twice in the early stage of seedlings and in the late stage of seedlings. Early fertilizer for seedlings is at the time of seedling setting or on 5 true leaves.

application, usually applied 5 to 6 kg Wudang.

Urea. In soils with insufficient phosphorus and potassium, if the basic fertilizer is not suitable for phosphorus and potassium, phosphorus and potassium fertilizer should be supplemented. Top dressing in the later stage of the seedling depends on the seedling mood and climate.

Autumn of rape is the parallel period of vegetative growth and reproductive growth, and the plant is the period of autumn large, long branches, large leaf area, and flower eye differentiation, which is the period of most fattening and an important period of increasing branches. Therefore, it is necessary to appropriately stabilize the autumn rain according to the application and growth trend of base fertilizer and tombstones. The base tombstone is well fertilized, and the plants grow and are fruitful, with no or no fertilization.

If the wonderful fertilizer is insufficient, those who have a tendency to defertilize should apply fertilizer as soon as possible. Generally, 15-20 kg per mu of high-nitrogen compound fertilizer is applicable. The fertilizer time is generally in the middle of autumn, and the height of autumn is 15 30 cm.

However, people with weaker initial strength can apply fertilizer at the beginning of autumn to avoid premature aging.

Rape after the autumn generation.

The number and weight of seeds are closely related to the nutritional conditions after flowering. Due to the strong growth momentum, people who are not in large quantities during the autumn season can not give or apply less. Not suitable for early-maturing varieties, or less for flowering periods.

Autumn rain can be sprayed on the leaf surface during flowering, and ether or potassium dihydrogen phosphate can be sprayed during flowering pods.

Of course, rape should be topdressed in winter, because rape is a rapid growth process in winter, and if nutrients are not replenished in time, it will directly affect the flowering and fruiting of the following spring. Generally, it is better to top dressing in the morning in winter, when it is conducive to rape absorption.

In our lives, do winter canola need to be topdressed? When exactly is the top dressing? Generally, after a long winter, overwintering rape accelerates its growth in spring and enters the flowering and pod-setting period, and the rape belongs to the infinite inflorescence, and the flowering and pod-setting time is relatively long, and it can mature while flowering and pod-setting.

After careful management in the early stage, rape enters the flowering and podopting stage, generally in the early flowering stage of rapeseed, the growth is vigorous, and the growth is relatively good, so as not to apply nitrogen fertilizer to prevent rape from being greedy for green and late maturing due to excessive nitrogen. If the growth potential of rape is relatively weak, potassium dihydrogen phosphate + urea + Tianda 2116 can be used to spray the whole plant, and about 70 80 kg of aqueous solution is needed per mu. In fact, how to fertilize rape depends on the situation of the plot and the growth of the plant, and finally achieves the effect of balanced fertilization.

After the full application of organic fertilizer, vegetable farmers can add nitrogen, phosphorus and potassium fertilizers according to the fertility of the soil and the yield standard, in principle, to control the amount of nitrogen fertilizer, increase phosphorus fertilizer and potassium fertilizer. Nitrogen, phosphorus and potassium fertilizers are the fertilizers that must be applied to each crop.

Fertilizer should be done around September, while winter rape is planted in early September and harvested in April-May of the following year.

1. Apply seedling fertilizer early.

Early application and frequent application of seedling fertilizer, timely application of nutrients required for rapeseed seedling stage, and the use of short high temperature before winter to promote the growth of rapeseed, achieve strong seedlings and overwinter, 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 at the time of seedling setting or 5 true leaves, generally 5-6 kg of urea per mu, in the soil deficient in phosphorus and potassium, if the base fertilizer is not applied phosphorus and potassium fertilizer, phosphorus and potassium fertilizer should 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.

2. Steady application of sprout fertilizer.

The rapeseed stage is the period of vegetative growth and reproductive growth at the same time, the plant rapidly pulls the sprouts, grows branches, the leaf area increases, and the flower buds are greatly differentiated, which is the period when the most fertilizer is needed, and it is also the key period for increasing branches and pods. Therefore, according to the application of base fertilizer and seedling fertilizer and growth, it is necessary to apply sprout fertilizer stably as appropriate. The base and seedling fertilizer are sufficient, the plant grows robustly, and less or no fertilizer can be applied; If the base and seedling fertilizer are insufficient, the fertilizer should be applied as soon as possible if there is a tendency to defertilize.

Generally, 15-20 kg of high-nitrogen compound fertilizer is applied per mu. The fertilization time is generally in the middle of sprouting, and the height of the sprout is 15-30 cm. However, if the growth is weak, fertilizer can be applied at the beginning of sprouting to avoid premature aging; The strong growth can be applied in the late stage of sprouting, when the sprout is 30-50 cm high, so as not to cause canopy closure during the flowering period.

3. Skillfully apply 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 avoided 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. In addition, borax aqueous solution can be sprayed once in the late seedling stage and at the budding stage to prevent the phenomenon of "flowers but not fruits" and improve yield.

The fertilization principle of rapeseed: apply sufficient base fertilizer, early application of seedling fertilizer, heavy application of wax fertilizer and moss fertilizer, and skillful application of flower fertilizer. Control nitrogen fertilizer and increase boron fertilizer.

Heavy application of basal fertilizer, early application of seedling fertilizer, heavy application of moss fertilizer, skillful application of flower fertilizer, control of nitrogen fertilizer, and increase of boron fertilizer.

Apply the bottom fertilizer first, and apply seedling fertilizer when the rape rises to 5-6 true leaves, and then apply the Fujinmen balanced water-soluble fertilizer to promote the healthy growth of rape and improve the ability of rape to resist stress and disease.

Rapeseed fertilization should be based on the crop growth stage, seedling fertilizer, moss fertilizer, flower horn fertilizer, skillful application of shed fertilizer, to increase the seed setting rate.

Each crop has different nutrient requirements at different growth stages, and oilseed rape is no exception. Therefore, in order to obtain high yield and high quality of rapeseed, it is necessary to apply sufficient basal fertilizer and reasonable top dressing.

Early application of seedling fertilizer due to the long seedling stage of rapeseed and large amount of fertilizer absorption. Therefore, seedling fertilizer must be applied in advance to promote the growth of rapeseed before winter and ensure overwintering. Seedling fertilizer is generally applied in accordance with the principle of "early, fast and light" after transplanting rapeseed trees or in the fifth to sixth leaf stage of direct seeding rapeseed.

The so-called "early" means that the time of top dressing is early, and transplanting rape can be applied 3 to 4 days after the live tree.

In early spring, when the temperature rises to more than 10, rapeseed buds and sprouts emerge one after another, which is a vigorous growth period with fast growth and more fertilizer. Sprout fertilizer is applied before or at the beginning of rapeseed sprouting, which can make rapeseed grow steadily in spring and have many strong branches. Top dressing should be done "fast" and "early", and 25 kg of urea or ammonium carbonate can be applied per mu.

For rapeseed with late sowing period, serious frost damage and poor seedling potential, it should be applied early and more often.

1. Sufficient basal fertilizer is the basis for high yield of rapeseed, which should account for about 60% of the total in a lifetime. Apply plantar fertilizer. To achieve a yield of about 250 kg per mu, for the field of medium fertility, 2000-3000 kg of high-quality organic fertilizer, 50-60 kg of cake fertilizer, 8-10 kg of chemical anorrhinogen, 5-6 kg of phosphorus, 3-5 kg of potassium, and kg of borax are generally applied per mu.

2. Rapeseed seedling fertilizer should be applied appropriately early, which should account for 10-15% of the total application amount, and 10-7 kg of urea or 10-15 kg of ammonium carbonate should be used in kind. Early application of seedling fertilizer. The application of chemical fertilizer must be determined according to the weather and soil moisture, and can be directly sprinkled when the soil moisture is high, which is to water the fertilizer with water.

3. Before fertilization, cultivate and weed, then cover the straw, and then use ditch soil to build the roots. Rapeseed wax fertilizer is mainly used for slow fertilizer heating and warmth, generally 3000-4000 kg of soil miscellaneous fertilizer, about 20 kg of compound fertilizer, and 300-500 kg of straw per mu. Steady application of wax fertilizer.

4. Moss fertilizer is a fertilizer with high fertilization efficiency in the life of rapeseed, usually accounting for about 30% of the total amount of fertilizer. Second, nitrogen and potassium fertilizer are used, for autumn and winter strong seedling fields, at the end of January and early February: generally apply 15-20 kg of urea and 5-6 kg of potassium chloride per mu; Third, for the serious lack of fertilizer field, it is advisable to apply moss fertilizer in two times, which should be 5-7 days earlier than the one-time moss fertilizer application period, and the second time interval is 10-15 days, and the dosage is slightly more.

Heavy application of moss fertilizer. 5. Drenching fertilizer can make up for the lack of fertility in the middle and late stages. Skillful application of flower fertilizer. It should be determined according to the seedling condition, soil fertility, etc., for the stable growth and insufficient fertility after spring, 4-7 kg of urea per mu, or 8-10 kg of ammonium sulfate, and at the same time, the weak growth of the group, individual should be applied early; Fields with good growth and sufficient stamina should not be applied again.

6. Brassica napus is a boron-loving crop, hybrid rape is more sensitive to boron reaction, boron fertilizer is generally more economical and efficient to use base fertilizer and spray foliage, base fertilizer is mixed with kilograms and bottom fertilizer per mu, and 150 grams of borax are used each mu in the bud moss stage and early flowering stage when spraying leaves, and sprayed twice with 50-75 kg of water. Boron fertilizer must be applied.

7. Generally, 150 grams of potassium dihydrogen phosphate, kilograms of urea, and 50-60 kilograms of water are used each mu, and they are sprayed 2-3 times, which can also be combined with disease prevention and insect treatment. Root vigor decreased after flowering, and supplemental application of leaf fertilizer was an effective way to prolong the life of leaves and stems, increase grain weight and increase yield. Supplemental leaf fertilization.

Base fertilizer: Combined with land preparation, 1000-150 kg of high-quality soil miscellaneous fertilizer and about 8 kg of potassium fertilizer are used per mu, and they are applied after mixing and composting. Top dressing:

At the seedling stage, 300-500 kg of human manure, 5-7 kg of urea and 10-15 kg of ammonium carbonate were applied per mu; During wintering, 3000-4000 kg of soil miscellaneous fertilizer and 20 kg of compound fertilizer should be applied per mu, and weeding should be carried out before fertilization.

First, early application of seedling fertilizer in late November or early December, mainly organic fertilizer, 1500 2000 kg of organic fertilizer per mu, for some poor growth of the field, but also with the appropriate amount of fertilizer.

Second, the application of bud sprout fertilizer should be carried out when the main stem is 10 cm long, and the field with good seedling potential in the early stage can be slightly delayed. The application rate is generally 20% of the total fertilizer amount, but the fertility should be less than 20%, and the thin field can be greater than 20%. The fertilizer is mainly organic fertilizer, with compound fertilizer.

Partial application of nitrogen fertilizer or late and excessive fertilization can easily lead to the occurrence of diseases, cause growth, lodging, and reduce yield. At this time, the rape is smaller, and the fertilizer is applied next to the rape root, which is conducive to operation, and the fertilizer will not be sprinkled on the vegetable seedlings. Covering the excavated soil with chemical fertilizer can play a role in deep application.

1500 kg of organic fertilizer per mu, 20 25 kg of rape special fertilizer or 10 kg of urea.

Grow two cotyledons and start fertilizing the method of fertilization, and you can wash it with water.

In winter, rape should be topdressed

Winter rape topdressing tips

1) Skillfully apply seedling fertilizer.

After the seedlings are transplanted and returned to green, the earlier the better, generally 3 to 5 kg of urea, 5 kg of potassium chloride, 300 to 500 grams of boron fertilizer, 750 to 1000 kg of thin fertilizer water, 1 to 2 times need to be applied. Or apply 45 to 50 kg of ammonium carbonate per mu, and return to green as soon as possible after application, so as to make full use of the high temperature after the weather is sunny and promote rapeseed to root and grow leaves as soon as possible.

2) Reapply basal fertilizer.

The base fertilizer is mainly organic fertilizer, for the plot of medium fertilizer, 1000 to 1500 kg of rotted farm fertilizer, 10 to 12 kg of superphosphate, 5 to kg of ammonium carbonate are applied per mu, and the three fertilizers are mixed together when applied. Then applied into the rows, combined with cultivating and weeding, so as to keep warm, promote roots, protect roots and increase fertilizer.

3) Cultivating and fertilizing.

When planting rape into winter, we must first do a good job of cultivating it. Because the temperature in winter is very low, cultivating can not only increase the soil temperature, but also loosen the soil, and can also play a direct role in protecting the roots, which is very beneficial to the root growth of rapeseed. Then, an appropriate amount of organic fertilizer should be applied between the rows of rapeseed, which can not only provide sufficient nutrients for rapeseed, but also increase soil temperature.

Thermal insulationIn the winter, rape can flower and sprout normally, and it can also increase the potassium content of rape and reduce freezing.

4) Foliar sprays.

Foliar spraying of phosphorus fertilizer can enhance the cold resistance of rapeseed, the method of preparing phosphate fertilizer liquid is to crush with 2 kg of phosphate fertilizer per mu, and then put it into a container and add an appropriate amount of water to soak, remove it after a week, add 200 grams of urea per mu, and spray the leaves until dripping. If the container is small, a small amount of water can be added when the fertilizer solution is insufficient, reduce the evaporation of the solution, maximize the absorption and utilization of the leaves, and spray foliar fertilizer should be sprayed in the afternoon on a sunny day in windless weather.

5) Spring fat and strong seedlings.

Do a good job of late planting rape spring fertilizer and strong seedlings, which is an important measure to solve the problem of late planting rape to seize high yield, generally apply 8 to 10 kg of urea per mu after spring, and then apply 5 to 7 kg at the sprouting stage. Relying on spring fertilizer to achieve the purpose of high yield, strictly prevent downy mildew after spring of late-onset rapeseed, and can be controlled by pesticides such as disease and grass in the budding stage.