Effect of planting on flowering period

The flowering time of bluebells is also closely related to the planting time. Bluebells like cool environments, so it is best to plant them in spring or autumn. But it blossoms early and late at different planting times.

Under natural conditions (planting in the open field), sowing in January and February, the environment is suitable, Campanula will grow in summer. But it needs to blossom after winter.

At the end of summer, after the temperature drops, it begins to sow, and after a long winter, it continues to grow in spring, and it can blossom that year.

How to manage the flowering period of pear trees? Key technical points of flowering management of pear planting

In the process of pear planting, flowering is a very important period, which directly affects the yield and quality of fruit. In the flowering management of pear trees, there are some problems, such as improving fruit setting rate, protecting flowers and fruits, thinning flowers and fruits, and so on. So, how to manage the flowering period of pear trees? The following is to introduce the key technical points of flowering management of pear tree planting, let's take a look.

1. Artificial pollination to improve fruit setting rate

Most pear varieties need cross-pollination before they can bear fruit. If there are few pollination trees or improper pollination trees in the pear orchard, artificial pollination must be carried out to increase the fruit setting rate.

1. Pollen collection: pollen collection is generally combined with flower thinning. When the flowers of pollinated varieties are in the early flowering stage, the flowers are collected and the anthers are removed. One flower can be held in each hand, and the two flowers will rub against each other and the anthers will fall off. The anthers were dried at 20 ℃-25 ℃ at room temperature, not in the sun, and stored after drying.

Picture: pear flowering period management

two。 Pollination method:

(1) artificial pollination in the field: when pollination varieties are needed to be in full bloom, brush, pencil with rubber head, gauze ball, paper stick and other tools can be used to pollinate 5-10 flowers each time, and 1-2 flowers per inflorescence point.

(2) Feather duster pollination: in the full bloom of the pear orchard with pollination trees, tie the feather duster to the bamboo pole, first roll the pollination tree with pollen, and then gently roll on the pollinated variety tree, repeated 1-2 times inside and outside. This method is not suitable for windy or rainy days.

(3) releasing bees at flowering stage: although this method is not artificial pollination, it is also a good method of pollination. Generally, a bee can carry 5000-10000 grains of pollen, and each box of bees can guarantee 10 mu of pear orchard pollination.

(4) pollination or liquid pollination: large pear orchards can be pollinated by small dusting machines or sprayers in order to improve work efficiency. During pollination, 20-30 parts of dry starch can be added to each part of pollen, which can be used immediately; liquid pollination can be mixed into pollen suspension. The preparation method is as follows: 5kg water, 10g pollen, 250g sugar, 15g borax and 15g urea, mixed filter spray.

Picture: pear flowering period management

Second, prevent frost during flowering, protect flowers and fruits

Pear trees blossom early and bloom neatly, and frost during flowering period causes great losses, even no harvest, so frost prevention must be done. Irrigation before flowering can be used to reduce the ground temperature and postpone flowering, reduce or avoid frost damage; or whitening the tree trunk before flowering can make the tree temperature rise slowly, delay the flowering period for 2-3 days, avoid or reduce the harm of frost; or use smoke to prevent frost, smoke can reduce the radiation evaporation of soil heat, at the same time, smoke can absorb moisture, make water vapor condense into liquid and release heat, and raise the temperature.

Third, thinning flowers and fruits to improve quality

Flower thinning and fruit thinning is to remove an appropriate amount of flowers and fruits from trees with too many flowers and fruits. Reasonable flower and fruit thinning can save nutrition, increase fruit setting rate, increase yield, rejuvenate trees, overcome and reduce years, which is an important measure to ensure high yield, stable yield and high quality of pear trees. The sooner you can thinning flowers and fruits, the better. Bud thinning is better than bud thinning, bud thinning is better than flower thinning, flower thinning is better than fruit thinning, and the earlier it is, the more nutrients are saved. Bud thinning should be carried out during bud germination, flower thinning should be carried out at full flowering stage, and fruit thinning should be completed within one month after flowering.

Picture: pear tree planting

1. Interval thinning: postpartum according to the tree, inflorescence every other to one, leaving empty branches, flowers for flowers, next year's fruit. Generally thinning the weak branch inflorescence, retaining the strong branch inflorescence, and then thinning the fruit properly.

two。 Leave fruit according to distance: general pear trees leave one fruit every 15-20cm, strong branches leave a fruit closer, 10-15cm leave a fruit, weak trees and weak branches leave a fruit a little farther, 20-25cm leave a fruit.

3. The secondary shoots of fruit moss leave fruit: the secondary shoots of fruit moss are strong, two secondary shoots leave double fruit, one secondary shoot and medium-weak secondary shoots leave a single fruit, and inflorescences without secondary shoots leave no fruit.

4. Leave fruit by inflorescence position: in an inflorescence, choose 1-2 fruits in the lower part, the fruit stalk is long and thick, can grow into a large fruit, fruit shape standard. Remove the flowers and fruits from the upper part of the inflorescence

5. The coordinated layout of the whole tree: more in the inner chamber and lower layer of the crown, less in the periphery and upper layer, more in the auxiliary branches, less in the backbone branches, more in the middle of the backbone branches, less in the lower part, more in the upper branches on the back of the trees in full fruit, less in the back branches, and less in the flowers and trees when they are weak. The general principles of flower thinning and fruit thinning are: ensuring yield, improving quality, selecting the best and removing the bad, and adjusting the distribution.

[conclusion] doing a good job in the flowering management of pear planting directly affects the fruit yield and quality of pear trees, and causes fruit growers to plant. Above, I introduce the key technical points of flowering management of pear planting. I hope it can be helpful to you!

Effect of Light at flowering stage on Alpine Rhododendron

There are still many technical problems in the cultivation methods of imported varieties of alpine rhododendron in our country. if we want to make the flowers of alpine rhododendron large and colorful, it is a key to pay attention to light during flowering. So how should the alpine rhododendron give light during the flowering period?

Alpine rhododendron

After 2 to 3 weeks, the plants were treated with artificial light to promote flowering. The light intensity is about 3000 lux, and the specific value should be adjusted according to the varieties of alpine rhododendron. In the light selection, it is best to choose a high-density sodium light source, which helps to open colorful flowers. The time of replenishing light is about 6 hours a day, which can be increased by 3 hours before and after natural light. Three weeks before flowering, to increase the filling time, 24 hours if necessary.

Experts remind growers that although artificial light is important, natural light is more critical for alpine cuckoos and must make full use of sunlight in the cultivation process. Open the window when you see the sun, and close the window when there is no sun. Some producers don't open the windows until around 11:00 for fear that opening the windows for a long time will lower the indoor temperature and increase the cost of heating up. I very much disagree with this method, because although it can save production costs, it will lead to poor product quality. In order to cultivate high-quality alpine rhododendron, we must not leave enough sunshine.