Breeding method of China clover
1, breeding mode
Chlorella can be propagated by sowing, cutting or dividing plants, which can be carried out in spring, summer and autumn.
Sowing propagation
The capsule can be harvested after it changes from green to grayish brown. Because the seeds mature in batches and the peel is easy to crack, they should be harvested in time. Dry the collected seeds in a windless place, gently knock out the seeds after the fruit cracks, and sow them with the harvest or store them at room temperature. Selecting soil with good air permeability and rich nutrition as sowing substrate, harrowing, compacting and scraping the seedbed. Thoroughly water the bottom layer before sowing.
Because the seeds are very small, it is necessary to mix them with fine sand or fine soil 1 ~ 2 times and spread them evenly. After sowing, cover the seedbed with plastic film to prevent water from evaporating too quickly. The optimum temperature for seed germination is 20℃ ~ 25℃. When the soil temperature is too high, the ventilation should be increased. Before and after the sunny noon, use a sunshade net to shade the sun, reduce the soil temperature, and avoid the seeds from losing their vitality because of the high soil temperature. It takes about 5-8 days from sowing to emergence. At seedling stage, attention should be paid to adjusting soil moisture and temperature, strengthening ventilation and enhancing illumination to prevent the occurrence of damping-off disease. When the seedlings have 2 ~ 3 pairs of true leaves, they are seedlings and transplanted.
cutting
Selecting coarse sand, sandy soil or garden soil mixed with sand as the substrate, cutting the tender buds on the robust branches into cuttings with a length of 5- 10 cm, obliquely cutting the base from the bottom of the node, leaving only 2-3 leaves at the top and removing the rest. Water it after insertion and maintain it in a semi-shady place. Spray water 1 ~ 2 times a day on the leaves, keep the substrate moist, and take root and transplant 15 ~ 20 days at the temperature of 20℃ ~ 30℃.
fissiparity
Before the temperature rises in spring and the new buds germinate, divide the plants by changing pots or transplanting. Cut underground rhizomes and leaves into several clusters, so that each cluster has 3 ~ 5 stems, and then plant them in pots or in the open field respectively.
2. Disease control
Trifolium pratense has strong botany and few pests and diseases. Occasionally, root rot occurs, mostly in hot and humid seasons, which often leads to root rot and even plant death.
Prevention and control methods:
(1) Strengthen the drainage in the planting area;
(2) spraying bordeaux solution 1 time every 6 days or so for 3-5 times continuously;
(3) Remove the diseased plants and burn them, and disinfect the diseased spots with lime solution to prevent the spread.