How long is it good to start fertilizing and watering small greens in greenhouses?

After the greenhouse and small greens are three-leafed, you can start fertilizing and watering.

Cultivation techniques of small cabbage (Chinese cabbage).

1. Sowing time.

The growth cycle of Chinese cabbage is short, and it is generally planted for about 20 to 30 days, and it can be harvested by tree. Autumn and winter cabbage is sown from September to October, and in the southern region it can be sown in December. Spring cabbage is sown in batches from February to early April, and summer cabbage is sown in batches from May to September.

2. Soil preparation and fertilization.

Chinese cabbage has strong adaptability to soil, and grows better in soil with fertile soil and strong water and fertilizer retention. When preparing the land, it can be made into a flat furrow, and the width of the furrow is 1 to 1 meter. There is a lot of rain in summer and autumn, and it should be planted with high furrows, and the furrow surface is smooth.

The base fertilizer should be base fertilizer, mixed evenly with the soil, when the soil is acidic, lime should be added when preparing the land.

3. Sow seeds. Chinese cabbage planting has sowing, strip sowing and seedling transplanting, the amount of sowing is more than strip sowing, generally in summer and autumn planting, the method of sowing is adopted. In winter and spring and when planting in greenhouses, seedlings should be raised before transplanting.

Before sowing, soak in warm water for 12 hours, then germinate at 15 to 20 times, and wait for more than half of the seeds to germinate. Before sowing, it should be watered, and after the furrow surface is moistened, it should be sprinkled and covered with 1 cm of soil.

4. Field management.

Seedling management. After the emergence of the Chinese cabbage, keep the soil moist, the seedlings should be thinned twice in the denser place, and the first seedling should be carried out when two true leaves grow, and the seedling distance should be two centimeters, and the weak seedlings and diseased seedlings should be removed. A second thinning is carried out when 3 to 4 true leaves have grown, and the seedling spacing is 5 or 6 cm.

After each seedling, it is necessary to water. When the cabbage grows five or six leaves, it should be transplanted, and the distance between the plants should be 10 to 15 cm. After the cabbage is planted, it is necessary to water the planting water to promote the slow seedling.

Water and fertilizer management. Chinese cabbage can be harvested during the vegetative growth period, which requires more nitrogen and less phosphorus and potassium fertilizer. In the plot with sufficient bottom fertilizer, after the cabbage enters the vigorous growth period, a small amount of nitrogen fertilizer should be applied, and 10 to 15 catties of urea can be used per mu.

Phosphorus and potassium fertilizers are applied in the base fertilizer, and foliar sprays of potassium dihydrogen phosphate and amino acids can be applied in the later stage.

The water requirement of cabbage seedlings is small, and the soil is kept dry and wet. When it comes to the vigorous growth period, irrigate every 3 to 4 days, and reduce the frequency of watering when planting in winter to prevent the soil temperature from dropping after watering and affecting root growth.

More than five leaves, or three tons of powdered organic fertilizer, the growth will be better.

7-10 days after the seedlings of small green cabbage, choose a special water-soluble fertilizer to promote rooting and fertilization.

Vegetables can be fertilized 7-10 days after transplanting, fertilization to promote rooting of the special water-soluble fertilizer, this kind of fertilizer can ensure the healthy development of the root system of greens, while improving the stress resistance of vegetable seedlings, greens before transplanting, need to first turn the plot over fluffy, and then put on a neat nest, before the seedlings are watered once, half an hour later and then the greens with soil.

Planted in the nest. <>

How to manage the green vegetables after they emerge

1. Watering control

After the greens come out, the first thing we need to do is the control of watering. Generally speaking, when the seedlings of green vegetables emerge in the hot season, we should water the vegetables in time, avoid watering at noon in the morning and evening, and do dry and wet, in order to maintain the moist state of the soil, real-time control.

2. Fertilization control

After the seedlings emerge and until they are ripe, we fertilize them periodically to provide them with sufficient nutrients so that they can thrive. Generally speaking, we can use well-rotted cake fertilizer or liquid fertilizer, dilute and apply, so that thin fertilizer can be applied frequently, and a small amount can be applied many times.

3. Pest control

After the seedlings emerge, the greens will begin to be infested with pests and diseases, making it unable to grow normally. We need to allocate enough pesticides in advance, spray them on the fields and plants with watering cans, and find the root of the disease in time when there are pests and diseases, and eradicate them in time to stop the loss, so that the vegetables can grow healthily.

4. Harvest

After such a period of maintenance work, if we take care of it carefully enough, we will find that the vegetables will grow strong and strong quickly, and we should harvest and harvest in time according to the market situation and the growth of vegetables, and choose the right time period for the next batch of planting.

Before planting, cabbage must first apply sufficient base fertilizer, also known as base fertilizer. It is about 50 centimeters below the roots of the cabbage soil. Put some well-rotted organic fertilizer, and after the cabbage is planted, after the seedlings are slowed down and about five or six leaves have grown, nitrogen fertilizer can be applied.

The cabbage grows gradually. At that time, the temperature also gradually decreased. At this time, an appropriate amount of potassium fertilizer can be applied. A fertilizer has the effect of strengthening roots, which can kill the roots and is huge, which is convenient for absorbing nutrients in the soil, and potassium fertilizer is also available. Helps plants withstand the cold.

In addition to applying fertilizer to the soil, cabbage can also be used to apply fertilizer to the foliage. Nitrogen fertilizer can be applied to the leaves of cabbage every 15 days or so.

By around October, the cabbage has grown into a ball. At this time, it is suitable to apply some well-rotted organic fertilizer, which is rich in nutrients very comprehensive and sufficient.

By the end of November, the cabbage was already very large. At this time, we need to clean up the yellow leaves on the outside. for easy ventilation. Cabbage is also in the harvest season.

Summary 1Before planting, cabbage must first apply sufficient base fertilizer, also known as base fertilizer. It is about 50 centimeters below the roots of the cabbage soil.

Place some well-rotted organic fertilizer, 2After the cabbage is planted, nitrogen fertilizer can be applied after the seedlings have been slowed down and about five or six leaves have grown.

3.The cabbage grows gradually. At that time, the temperature also gradually decreased. At this time, an appropriate amount of potassium fertilizer can be applied. A fertilizer has the effect of strengthening roots, which can kill the roots and is huge, which is convenient for absorbing nutrients in the soil, and potassium fertilizer is also available. Helps plants withstand the cold.

4. In addition to applying fertilizer to the soil, cabbage can also apply fertilizer to the foliage. Nitrogen fertilizer can be applied to the leaves of cabbage every 15 days or so.

5. By around October, the cabbage has grown into a ball. At this time, it is suitable to apply some well-rotted organic fertilizer, which is rich in nutrients very comprehensive and sufficient.

6.By the end of November, the cabbage was already very large. At this time, we need to clean up the yellow leaves on the outside. for easy ventilation. Cabbage is also in the harvest season.

1. Chinese cabbage requires high soil moisture at the seedling stage.

2. The seedling stage is in the high temperature and dry season, and it is generally required to water once in 3 or 4 days, so as to achieve "three water seedlings, five water trees".

3. Chinese cabbage is generally "squatting" for 4 6 days after the seedling water, combined with top dressing and watering 1 time, and then generally watering once every 6 7 days to keep the soil moist.

4. The rosette stage of Chinese cabbage is the period when the outer leaves enter the period of rapid formation and development, and the roots are irrigated with 5 kg of rooting agent diluted 200 500 times per mu or applied with watering.

5. Chinese cabbage has entered the balling period, and the demand for fertilizer and water has reached its peak. In this period, it is necessary to reapply fertilizer, and 5 kg of Bika granular fertilizer or 2500 kg of human manure can be applied per mu, and it is generally applied to the field with water.

Summary. When to water the greenhouse greens in winter, the watering time of the greenhouse vegetables in winter does not need to be ventilated before watering, and there are certain requirements for the watering time of the greenhouse vegetables in winter, which should generally be watered at noon, and the best watering time is 10 o'clock to 15 o'clock every day. Because the greenhouse temperature during this time period is very high, frost damage can be avoided.

Use well water as much as possible when watering. Because the temperature of the well water is relatively high, it is also possible to heat the water to about 10 degrees Celsius. Prevent the water temperature from being too low and causing vegetables to be difficult to adapt to and cause frost damage.

When to water the greens in the greenhouse in winter, and do you still need ventilation before watering?

When to water the greenhouse greens in winter, the watering time of the greenhouse vegetables in winter does not need to be ventilated before watering, and there are certain requirements for the watering time of the greenhouse vegetables in winter, which should generally be watered at noon, and the best watering time is 10 o'clock to 15 o'clock every day. Because the temperature of the large ant key shed during this time period is very high, it can avoid frost damage. Use well water as much as possible when watering.

Because the temperature of the well water is relatively high, the water temperature can also be increased to about 10 degrees. Prevent the water temperature from being too low, causing laughing things to leak, and vegetables are difficult to adapt to, resulting in frost damage.

When to apply the medicine after the seedlings of the small green cabbage emerge, ask for the medicine every few days.

Do you still need ventilation before watering.

2-3 days. Watering should be carried out around noon on a sunny day, and proper ventilation and humidity should be dispersed after watering to prevent excessive humidity in the shed and the spread of pests and diseases.

Summary. Hello dear! Water properly the next day after fertilization, which can prevent the fertilizer from burning the roots of the plant, and also promote better absorption of nutrients by the roots.

If you choose a thick fertilizer when fertilizing, you can also water it immediately, which can play a role in diluting the thick fertilizer, and the amount of water should be controlled when watering, especially when the amount of fertilizer is relatively small, you should water less and avoid stagnant water.

Hello dear! Watering properly the next day after fertilization can prevent the fertilizer from burning the roots of the plant, and it can also promote better absorption of nutrients by the roots. If you choose thick fertilizer when fertilizing, you can also immediately water high collapse, which can play a role in diluting thick fertilizer, and the amount of water should be controlled when watering, especially when the amount of fertilizer is relatively small, it is necessary to water less hand reeds and avoid stagnant water.

Depending on the situation, if the soil is relatively dry, it can be watered immediately after fertilization, and if the soil moisture can meet the requirements of crop growth, it can be watered when needed.

Fertilizer should be carried out within 10-15 days after the emergence of Chinese cabbage, and nitrogen, phosphorus and potassium compound fertilizers can be used.

To speed up its growth rate, when maintaining the cabbage, it is necessary to water it every other week to keep the soil moist, and it is also necessary to let the cabbage receive all-weather natural light, and it is also necessary to spray the bactericide regularly to maintain the normal growth of the cabbage.

1. Fertilization time

Fertilization is carried out within 10-15 days after the cabbage sprouts, and when fertilizing the cabbage, you can use a nutritionally balanced nitrogen, phosphorus and potassium compound fertilizer, or you can use the farmhouse fertilizer after decay, to provide the nutrients needed for the growth of the cabbage, it should be noted that the fertilizer can not be buried near the roots of the cabbage, so as not to make it fertilized.

2. Sufficient moisture

Chinese cabbage is a water-loving plant, but it is not resistant to waterlogging, and when cultivating Chinese cabbage, it needs to be watered every other week, and the soil needs to be completely soaked when watering, and it is also necessary during the rainy season.

, drain the stagnant water in the soil for the cabbage, so as not to make it watery and rot, and also need to build a canopy above the cabbage to maintain the normal growth of the plant.

3. Lighting conditions

When cultivating cabbage, it needs to be placed in a place where it can be exposed to sunlight, so that the plants can receive all-weather natural light, so that the cabbage grows more vigorously, and it is also necessary to do a good job of shading the cabbage in the middle of summer, and you can use a dark curtain to cover the top of the cabbage to avoid its leaves being sunburned.

4. Prevention and control of pests and diseases

When cultivating cabbage, you need to regularly observe the growth state of the plant, if you find that there are insect spots on the cabbage leaves, you need to immediately spray it with fungicide to remove the pests on the plant, and you also need to use sharp scissors to cut off the leaves of the cabbage with serious disease, so as not to cause large-scale infection.

After the cabbage sprouts, it can generally be watered between 10 and 15 days, and the fertilizer is mainly nitrogen fertilizer, which can promote the growth of branches and leaves. During the maintenance period, the cabbage should also be given sufficient water and light, which is conducive to the growth of the cabbage stems and leaves. During its growth, it needs to be watered in moderation, the soil kept moist, and sprayed to prevent pests and diseases.

Chinese cabbage is an annual or biennial herbaceous plant of the Brassica family of the cruciferous family, often known as green cabbage, with high nutritional value. Cabbage can be sown between March and November, and is generally sown during the spring period. After sowing, under the condition of suitable temperature and sufficient moisture, germination can generally occur in 3 7 days, and thin fertilizer can be poured 1 time 10 to 15 days after germination.

Cabbage has a greater need for water during the seedling period, but it should be watered in moderation to keep the soil moist. If the temperature is high, you need to increase the amount of watering, you can water twice a day, try to do it in the morning and evening. In the early stage of growth, Chinese cabbage also needs an appropriate amount of fertilization, and the fertilizer is mainly nitrogen fertilizer, which can promote the growth of branches and leaves.

Thin nitrogen fertilizer can be applied 1 2 times during the seedling period of Chinese cabbage, and 1 thin fertilizer can be applied between 7 and 10 days after the growth is stable in the later stage. During the maintenance period, in addition to fertilizer and water, it is necessary to give the cabbage enough light. In sufficient light environment, bok choy can photosynthesize and accumulate a large amount of nutrients for its growth.

Bok choy is susceptible to pests and diseases during its growth, and common pests such as cabbage worms, aphids, borrowers and fleas are common. During the maintenance period, the cabbage can be sprayed regularly for prevention, generally 15 to 30 days can be sprayed once. If it is a pest on the cabbage, you need to cut off the insect leaves, and then spray the cabbage with relevant pesticides**.