Cultivation requirements of 5 ℃ Tulip bulb

1. Carefully remove the brown outer epidermis from the roots before planting.

two。 On slightly moist soil, plant bulbs at the specified number of bulbs per square meter and at the correct depth.

3. Provide recommended temperature conditions for bulb depth and plant height in the greenhouse.

4. The relative humidity in the greenhouse must not exceed 80%.

5. To maintain the optimal water content of the soil in the greenhouse.

6. Check plants, temperature, and relative humidity frequently; be sure to use annual testing equipment.

Peeling of bulbs

The peeling of the bulb refers to the careful removal of the brown layer coated outside the root. The advantages of peeling 5 ℃ bulbs before planting are:

Prevent the root damage caused by the contact between the residue of bulb disinfection and the root before planting.

-- it can be planted shallowly to avoid the damage of Rhizoctonia to the stem.

Promote the uniform growth of root system, so as to make the whole plant grow steadily and blossom.

The cultivation time in greenhouse can be shortened by 3-4 days.

-- bulbs infected by the disease are easily distinguished and removed.

Its disadvantages are:

-- increased risk of bulb damage, especially serious root damage

Extra labor is needed.

Planting requirement

The number of plants planted depends on the variety, bulb volume and harvest time.

For peeled bulbs, the bulb nose should be exposed to the soil when planting. At this time, the soil structure should be in good condition, and water should be irrigated immediately after planting to prevent drying and dehydration.

The unpeeled bulb is planted at a depth of 2-4 cm, covering the top of the bulb, which promotes the rooting process.

In the process of bulb planting, the underlying soil should be very loose and the bulb should not be inserted recklessly into the soil. Proper planting should ensure that damage to the root primordium is reduced, and sometimes roots are present at the root base. After planting, put a layer of coarse peat on top of the cultivated soil to prevent damage to the soil structure during watering.

Greenhouse temperature

After planting, the soil temperature at the depth of the bulb is very important. To prevent soft rot, keep the soil as cold as possible after two weeks of planting, preferably 10 ℃ or less. During the earliest planting period from October to November, this temperature condition is difficult to maintain and may be higher. If the soil temperature in the greenhouse is higher than 17 ℃, it is best to postpone planting for 1-2 weeks. This is why we should not only choose a planting site that is cool enough, but also take correct measures before and after planting to ensure that the soil temperature is as cool as possible. This can be achieved through the following measures:

Add mulch to the soil before planting, and cover the soil with straw after planting to prevent sunlight.

Do not add mulch to the greenhouse within two weeks after planting, but shade cloth can be used instead in the early stage before planting.

If mulch or shading is used, adequate ventilation should be provided.

Before and after planting, sprinkle the soil of the greenhouse with cold water.

Relative humidity

If the relative humidity in the greenhouse is too high, the transpiration process of the upside-down bulb will lead to growth disorder such as leaf, stem and flower collapse, stem water immersion, and even flower wilting. In addition, the high relative humidity in the greenhouse will also increase the infection of botrytis pathogens and produce lighter and weaker seedlings.

To prevent such problems, the relative humidity should be kept below 80%. Ventilation can achieve this purpose. If the wind is low and the weather is stuffy, it is recommended to warm up and ventilate a little bit.

When cultivating varieties with more leaves and more sensitive to quenching disease (such as Leenv.dMark), a ventilator can be installed to blow horizontally in the greenhouse to effectively promote evaporation. The planting density of this kind of variety should be lower.

Watering

Water before planting to lower the soil temperature. Bulbs should be planted in slightly moist soil, and watering after the value is beneficial to early rooting. After planting, it is necessary to give a certain amount of water, and the water supply through the sprinkler irrigation system from above is beneficial to rooting. usually, the water supply should be based on the premise of keeping the soil structure intact.

In the process of cultivation, it should be watered properly, too much watering is very dangerous. The closer to the harvest time, the more water supply system with less water should be used.

It is difficult to specify the frequency of watering, which depends on many factors, including:

-- Plant growth stage; the more leaves, the more transpiration.

-- Climate.

-- more or less ventilation.

-- the varieties used.

-- soil type.

Total salt content.

The standard used in practice is that the soil under the bulb can be pinched into a ball, so that there is enough water for the plant to grow.

Plants should be watered when they are short of water, usually before the morning. Ventilation after watering can reduce the relative humidity between plants. if harvesting has begun, it is usually watered after harvest.

Cultivation cycle

The greenhouse cycle of a variety is determined by the temperature during storage and the temperature in the greenhouse, and the humidity level in the greenhouse also affects the cultivation cycle.

Greenhouse control

First of all, the temperature and relative humidity of the air at the same height as the plant in the greenhouse must be controlled throughout the cultivation cycle. Use annual thermometers and hygrometers to measure.

When tulip plants grow to a height of 5-10 cm, the plants should be examined for Botrytis cinerea, rot and diseases caused by Botrytis cinerea. Plants with no stem development or slow stem development may be infected by Fusarium and be removed immediately after discovery to prevent the harmful effects of ethylene gas produced by these diseased plants on the surrounding plants.

Plants infected with Fusarium can spread a large number of spores before symptoms appear, and as long as these spores are above the ground, they may cause infection in other plants, so it is important to remove these bulbs in time and carefully.

Fertilizer application

Usually, no fertilizer is needed, but if the bulb cannot absorb enough nitrogen, consider applying some nitrogen fertilizer. After the bulb is well rooted, 2 kg of calcium nitrate is applied every 100 square meters, spread in three times, every two times at an interval of one week.