First, the need for fertilizer characteristics

     Eucalyptus is one of the three fast-growing tree species, with developed roots, strong absorption and large growth. An adequate supply of water and fertilizer, 1 older 1.5 - 5.5 m, 4--5 years to harvest use. The main nutrients absorbed by eucalyptus are: nitrogen, phosphorus, potassium, calcium, magnesium, zinc, boron and the like. According to the study, each eucalyptus absorbs 36 grams of nitrogen , 2.8 grams of phosphorus , 20 grams of potassium , 31 grams of calcium and 8.5 grams of magnesium per year . The absorption is nitrogen > calcium > potassium > magnesium > phosphorus, absorption of nitrogen, phosphorus and potassium. The ratio is: 13 : 1 : 8 . Nitrogen-deficient plants are chlorotic or purplish red, and growth is hindered; potassium-deficient plants are weak, easy to fall, and the leaves are dull and dull; calcium and magnesium can increase the resistance of eucalyptus, making eucalyptus grow rapidly, and the tree is straight and well-balanced. The rate is high; zinc and boron promote the growth of eucalyptus apex. If these two elements are lacking, the eucalyptus will have dry buds or swollen buds, easy to wind , and weak bulges, which will seriously affect the growth of eucalyptus.

     Second, fertilization technology

     Eucalyptus fertilization must first meet the needs of eucalyptus for various nutrients; secondly, to achieve the right amount, with the minimum fertilizer input, to achieve maximum economic benefits; again, to master the fertilization method, improve fertilizer utilization.

     Eucalyptus fertilization is carried out as follows:

     Basal: 7 days before planting, fertilizing each eucalyptus special fertilizer or fertilizer 0.25 - 0.5 kg, the fertilizer is Cave, backfill layer 1-- topsoil 2 cm thick.

     Top dressing: 1 month after planting or 1 meter long after saplings , start topdressing, apply 0.25 kg of fertilizer or eucalyptus special fertilizer per plant to promote the early growth of eucalyptus; the second year, topdressing in March - April , per plant fertilizer or fertilizer 0.5 kg special eucalyptus; in the third, fourth year, once each fertilizer, compound fertilizer per plant or special fertilizer 0.8 kg of eucalyptus, eucalyptus promote rapid timber, 4--5 years to cut , timber yield up to 6--8 cubic meters.

     Topdressing points:

     1. Before each topdressing, we must weeding and avoid weeds.

     2 , 30 cm away from the root of the tree , in the direction of the tree root uphill, open the crescent-shaped fertilization ditch or open a fertilization point on the left and right sides of the root of the tree, cover the soil after application to prevent fertilizer loss.

     3 , it is best to choose fertilization after rain, fertilizer is easy to be absorbed.

     4 , slope ridge, soil is thin and thin, should be more fertilized, ditch valley, soil is thick and fertile, should be less fertilized, according to local conditions, reasonable dosage, cost savings, improve efficiency.

     5 , soil testing and fertilization, according to the soil testing and fertilization recommended card given by the technical department, fertilization, cost-effective.