Eucalyptus breeding techniques
October 18 09:09:23, 2018
1. Brief introduction of species of tree Eucalyptus is one of precious tree species in China. It is evergreen in the four seasons and has beautiful trees. It is also an excellent tree species on all sides. 2. Nursery technical nurseries should choose light, medium loam soil with deep, fertile and well-drained soil. Organic fertilizer should be applied as a base fertilizer in order to improve the soil and increase fertility. Spring sowing from early February to early March can also be broadcast during the winter. Using drills, the spacing is 30 centimeters and the seeding rate is 25 pounds per acre. The wet seeds should be germinated prior to sowing, soaking with warm water to sow germination, avoid soaking at high temperatures to prevent scalding. After sowing, the thickness of the cover soil is about 2 cm. After covering the soil, straw or ragweed should be covered. The seeds are germinated, germinated about 20 to 30 days after sowing, and germinated neatly. After the seeds have sprouted, the coverings should be removed promptly. When the seedling height is 5 cm, the seedlings and the seedlings should be planted. Choose thick seedlings and set seedlings at a distance of about 7 cm. A fertilizer is applied after the seedlings are set, and fertilizers are applied once in each of the months of June, July and August. Fertilizer is mainly nitrogen fertilizer, first light and thick. Seedlings have entered the late growth stage in October and nitrogen fertilizer should be stopped. Seedlings can be planted in the same year, and large seedlings can also be cultivated. The 1-year-old seedlings are 50 cm high and the root diameter is 0.7 cm. Planting capacity is about 20,000 per mu. The cultivation of large seedlings should be transplanted to promote the growth of lateral roots, mud ball should be taken out of the nursery, and appropriate cutting branches and leaves in order to improve the survival rate of afforestation. 3, the main pest control loquat leaf bee: larvae feeding the young shoots loquat leaves pumping, seriously affecting the growth of Eucalyptus. This worm occurs one or two generations a year in our province, and is the first and second generation larvae respectively in early May and early June. It can be sprayed with 2000 times of 90% trichlorfon or 50% of a marathon emulsion. The nest larvae: The larvae clustered on the shoots to feed on the leaf buds, and the spine rolled the leaves into balls, enclosing the top buds, causing the shoots to die. This larva occurs 2 generations a year. The first generation of larvae is endangered from the end of May to the middle of July; the second generation larvae are sprayed with the above-mentioned agents when they are still in the net, and this effect is best.