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Fertilization is to cultivate the the eucalyptus forest indispensable technical measures, to solve the contradiction between the the eucalyptus fast-growing consumption fertility, the use of livestock excreta as the main organic materials (there is a small amount of meal, peat, etc.), the conversion of the biosynthesis technology to produce small molecular humic acid, on this basis, according to the eucalyptus different growth stages required functional fertilizer types, together with the corresponding right amount of microbial compound fertilizer, N, P, K and trace fertilizers, deployment and produce Eucalyptus humic acid fertilizer (basal dedicated and dressing dedicated Class 2). Randomized block design to the Equal Investment conventional fertilizer control, multi-specialty fertilizer Fertilization Experiment of special fertilizer on the growth of forest biomass, soil fertility, a number of physiological and biochemical indexes, tree nutrition, trees resistance Effects and mechanisms of the analysis, the results show that: the development of eucalyptus humic acid fertilizer formula is feasible, special fertilizer in forest growth-promoting efficiency and improve the resistance, or in the improvement of soil fertility, improve forest trophic structure and fertilizer continuity, stability and adaptability in many aspects, has obvious advantages than conventional fertilizer, specifically: (1) with the equivalent conventional fertilizer inputs (fertilizer costs) compared to the application of special fertilizer the stand growth volume significantly or very significantly higher than that of the conventional fertilizer treatment applied within 19 months after the tree height, diameter at breast height were increased by 7.8% to 51.8% and from 9.8% to 53.0%, the biological productivity increased 30.2% to 81.1%; (2) to improve the cold hardiness of Eucalyptus, reduce the degree of frost damage, compared with conventional fertilizer, stand freezing rate, average frost damage and frost damage index were decreased by 28.3% to 43.5%, from 37.75% to 50.49 %, 36.42% and 49.71%; (3) improve soil fertility, improve the composition and quantity of the rhizosphere soil microbial flora. Was determined that more than two years after application, soil organic matter, total N, total P, available N, the effective P, available K content of than afforestation in front of the background value to improve from 5.5 to 5.9%, from 11.3 to 13.4% 3.7 to 5.7%, from 7.3 to 12.0%, from 19.5 to 26.4% and 36.3 to 42.7%. Especially soil available K and available P content can be greatly increased soil acidification has been checked, the pH value increased by 0.2-0.3 units; same time, the composition of the rhizosphere soil microbial improved, the number can be improved, reflecting the HA potential soil excavation forest biological fertility and inhibit the volatilization of nitrogen have a greater advantage; (4) the application of special fertilizer can promote the absorption of nutritional elements to improve the use efficiency of nutrient elements. Compared with conventional fertilizer, nutrient elements accumulation rate increased by 4.2% to 32.2%. The nutritional elements use efficiency increased by 14% to 27%; (5) special fertilizer can significantly improve the chlorophyll content, increased leaf area index, enhance tree vigor, conducive to photosynthesis, to increase production. It was determined that compared with conventional fertilizer processing, application of humic acid fertilizer trees in leaf chlorophyll content increased by 26.3% to 94.2%, leaf area index increased by 41.0% to 172.8%; (6) in the fertilizer continued on conventional fertilizer The fertilizer disappeared in the forest 3a birth. The special fertilizer humic acid fertilizer can last 4-5a, can be maintained longer nutrient supply. In addition, the amount of Fertilizers to explore, afforestation the appropriate specialty fertilizer application rate: the basal dosage 1000g / strain, the amount of dressing 646 g / strain; analysis of the stability and adaptability of the of HA eucalyptus special fertilizer. The optimum formulation: comprehensive application analysis and evaluation of the effect of selected basal dedicated organic matter ≥ 30.0%, NP 2 O 5 K 2 O ≥ 6.0% (2.5-2-1.5), the total amount of humic acid ≥ 8.0%, and with the right amount of \dressing dedicated optimization formula: organic matter ≥ 20.0%, the NP 2 O 5 K 2 O ≥ 20.0% (9-8-3) total humic acid ≥ 6.0%. Afforestation the special fertilizer suitable for application amount: the amount of basal 1000g / strains, the amount of dressing 646 g / strains.
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