Why do dragon fruits turn yellow after a few days of blooming?

I think we are all very familiar with the dragon fruit. What we usually see are the white dragon fruit and the red dragon fruit. The dragon fruit is very rich in nutrition, especially the best fruit to reduce the fire. How on earth did such a delicious dragon fruit grow? Let's get to know it with the editor.

Why do dragon fruits turn yellow after a few days of blooming?

If the dragon fruit flowers will be yellow and fall off two to three days after blooming, it means that the flowers are not fertilized normally and thus have no vitality. On the one hand, due to the self-flowering incompatibility of red meat dragon fruit, it is best to mix red meat and white meat varieties in the orchard, such as two rows of red meat varieties and one row of white meat varieties. On the other hand, if it rains continuously during flowering, especially in the evening (dragon fruit flowers usually begin to bloom 1-1.5 hours before sunset, fully open at sunset, the Corolla gradually closes at dawn, and wither before and after sunrise), too much Rain Water will reduce or invalidate the ejection ability of male anthers, as well as the receptive capacity of female stigmas, which will have a great impact on pollination and fertilization. On the other hand, there are generally 3-5 buds germinated from the same stem node, but after normal elimination, 1-2 buds will be left behind, and the rest will wither and fall off by themselves. However, when the flower buds germinate and the dry and wet changes of the orchard are too great, the buds will also yellowing and withering.

Growth conditions of dragon fruit

Fire dragon fruit is a tropical plant, like light and shade, heat and drought, fertilizer and barren, its stem can also grow on the rock, the plant is extremely anti-wind, as long as the bracket is strong enough to resist typhoon, 667 square meters plant 300Me 400 plants, one 20 cm square is buried in the middle of every 4 plants, and a 2-meter-high cement column can be used as a support. Pitaya can adapt to all kinds of soil, but it is better to use neutral soil and weakly acidic soil with more humus, water and fertilizer. In order to make it grow vigorously after planting, it is necessary to apply more disinfection, sterilization and fermentation of human, livestock and poultry manure organic fertilizer, calcium magnesium phosphate fertilizer and compound fertilizer at seedling stage, and the amount is determined according to plant size.

The dragon fruit is growing and rapidly in a warm, humid and sunny environment. It should be watered more when cultivated in the open field in spring and summer to keep its roots in a state of exuberant growth, and should be drained in time in overcast and rainy weather so as not to cause stem and flesh rot caused by bacteria. The dragon fruit is tolerant to 0 ℃ low temperature and 40 ℃ high temperature. In order to ensure its perennial growth and multiple fruit, the suitable temperature is 20 ℃ 30 ℃ as far as possible. The greenhouse must be built for planting in the north, and the night temperature in winter is not lower than 8 ℃. The plastic film can not be taken off in summer, but it must be ventilated. The fire dragon orchard does not need to be ploughed, and the weeds can be cut off in time. The dragon fruit has a thick waxy layer, smooth appearance, no bagging, and saves labor and time. The dragon fruit generally has no pest occurrence, occasionally there are nematodes in the roots and red spiders in the stems and leaves, which can be prevented and controlled in time. Fire dragon fruit from flowering to fruit ripening, about 30 days, when the fruit from green to red, the fruit slightly fragrant, bright, can be harvested.

Reproduction of dragon fruit

The seedlings of dragon fruit grown from seeds can generally be planted directly. Because the dragon fruit will not blossom and bear fruit until the length of the branch is more than 1 meter. Therefore, it is generally appropriate to use cutting seedlings or grafted seedlings for propagation and cultivation. Cuttings are easy to take root and are often used in production, but the growth and development of Huanglongguo cuttings is poor and the phenomenon of self-flowering incompatibility exists in the production of red flesh dragon fruit. Therefore, the above two varieties should use grafted seedlings to improve their quality and yield.

I. Cuttage seedlings

Spring and summer is the most suitable, the cuttings should choose the stem nodes with full growth, and the discarded branches can also be used for cutting seedlings, cutting the branches into 30cm when cutting, and inserting the sand bed or cutting directly under the support frame and on the side of the cement column after the wound is air-dried in the cool place. It can be carried out at any time except during the frost period. After cutting, there is no need to water, to maintain the dryness of the soil. The watering will begin in 10 days.

2. Grafted seedlings

Choose insect-free, robust growth, full stem of the rootstock, grafting in sunny days, the dragon fruit plant with a knife cut into 3 centimeters of stem segments, waiting for the wound to dry. The scion was cut into a plane with a horizontal knife 10 cm above the stem of the rootstock, the scion was inserted, aligned with the cambium, fastened with cotton thread, and cultured in the room. Under the condition of 28 ℃ and 30 cm, a large number of calli were formed on the wound joint surface in 4 to 5 days, and the color of the scion was close to that of the rootstock, indicating that the vascular bundles of the two were healed and grafted successfully, and then they could be moved into the pseudo-planting seedling bed to continue cultivation.

III. Seedling stage management

The nursery bed should be in a ventilated and sunny place, where the soil is fertile and the drainage and irrigation water is more convenient. Make the border fine, the border belt ditch should be 90 cm, apply 1500-2000 kg of rotten chicken manure or cow manure per mu, mix 1000 kg of grain husk, stir evenly, and apply to the topsoil layer 10-30 cm below the border surface during soil preparation. After that, the mother applied 100,150kg calcium magnesium phosphate fertilizer, stirred the calcium magnesium phosphate fertilizer evenly with a hoe, applied it to the topsoil layer 4cm deep, and then planted the seedlings in the nursery according to the row spacing of 3cm, and then sprayed 500 times carbendazim, whitening the topsoil on a sunny day, watering it once as appropriate (about 7-10 days), applying 6 kg compound fertilizer every 14 days, and waiting for the full stem section of Zhang Chu stem, you can come out of the nursery.

Field management of dragon fruit

The dragon fruit begins to blossom and bear fruit 14 months after planting, and can blossom 15 times a year. April to November is the fruit-bearing period. The fruit matures 30-40 days after flowering, and the single fruit weighs 500-1000g. It produces more than 20 fruits per column in the second year after planting, and enters the full fruit stage in the third year. The higher management level, the per unit yield can reach 2500kg/667m2. The main points of high-yield cultivation are as follows:

1. Apply thin fertilizer frequently. Due to the long harvest time of fruit, organic fertilizer should be re-applied every year, and nitrogen, phosphorus and potassium compound fertilizer should be applied evenly for a long time. Potassium and magnesium fertilizers should be added during flowering and fruiting period to promote sugar accumulation and improve fruit quality. Keep the soil moist during the fruiting period, and the tree plate is covered with grass or mushroom residue. When the weather is dry, 3mer will be irrigated once a day.

2. Pick the heart. When the branch grows to 1.3-1.4m long, it picks the heart, promotes the branch, and lets the branch droop naturally.

3. Intercropping and artificial pollination. When planting dragon fruit, it is necessary to plant about 10% of the white meat type dragon fruit. Mutual pollination among varieties can significantly improve the seed setting rate. In case of overcast and rainy weather, artificial pollination should be carried out. Pollination can be used to apply pollen directly to the stigma of female flowers before the flowers bloom in the evening or before the flowers are closed in the morning.

4. Prune the branches. After picking fruit every year, cut off the fruiting branches and let them send out new branches to ensure the yield in the coming year.

5. Pest control. Pitaya is easy to be harmed by snails and ants in seedling stage, and insecticides can be used to control it. In the season of high temperature and humidity, it is easy to infect diseases, such as partial branch necrosis and mildew spots, and can be controlled by strychnine, strong copper oxide and so on.

Through the introduction of the above editor, we must have a general understanding of other aspects of dragon fruit besides its delicious taste. In fact, the cultivation of dragon fruit is not a very simple thing, it takes a lot of efforts to eat delicious fruit. So when we eat delicious dragon fruit, we first want to thank the friends who have worked hard to grow it.