桉树腐殖酸(HA)专用肥区域试验与配方的优选

Section Trials to Select the Optimization Formula of Humic Acid Special Fertilizer for Eucalyptus

采用随机区组设计，以等价投入的常规化肥为对照，开展专用肥多点施肥试验研究．通过专用肥对林木生长量、林相特征的影响分析，结果表明：与等价投入（肥料成本）的常规化肥相比，施用系列专用肥的林分生长量均显著或极显著地高于常规化肥处理，且叶片浓绿、树势强壮，施后19个月内，树高、胸径、材积分别提高了7．8％～51．8％、9．8％～53．0％和30％以上，叶片叶绿素含量提高26．3％～94．2％，叶面积指数提高41．0％～172：8％．经对HA桉树专用肥的增产性、适应性和稳定性的综合分析与评定，选出基肥专用的优化配方为：有机质≥30．0％、N＋P2O5＋K2O≥6．0％（2．5—2．0-1．5）、腐殖酸总量≥8．0％，并加上适量的“绿滴”复合微生物菌剂（于施用时和基肥按每50kg：1kg的量掺入）；追肥专用的优化配方为：有机质≥20．0％、N＋P2O5＋K2O≥20．0％（9—8—3）、腐殖酸总量≥6．0％．

Using general fertilizer with equal cost as a comparison, trials of special fertilizer were carried out in different places according to randomized block design. The results show that the growth of eucalyptus fertilized with special fertilizer was remarkably or specially remarkably higher than that with general fertilizer, and the leaves were more thick and green, the growing stronger, the height, diameter at breast height, and wood volume were respectively 7.8% - 51.8%, 9.8% - 53.0% and 30% higher, leaves chlorophyll content was 26.3%-94. 2% higher, leaf area density index was 41.0%-172.8% higher. The productivity, adaptability and stability of humic acid special fertilizer for eucalyptus were then analyzed and evaluated for the selection of optimization formula. Various components in the formula for base fertilizer were as following： organic matter≥ 30.0 %, N ＋ P2O5＋ K2O≥6.0 % （2.5-2- 1.5）, total amount of humic acid≥8.0%; proper compound microorganism inoculum should be mixed with base fertilizer （1 kg：50 kg）. And, proper components for topdressing should be.organic matter ≥ 20. 0 %, N ＋ P2 O5 ＋ K2O≥20.0% （9-8-3）, and total amount of humic acid 6.0%.