Fertilization has been widely applied to increase and sustain productivity of plantations, especially in poor soils. N, P, K, and compost are usually used for forest plantation in Vietnam. The amount of fertilizer and rates of concerned nutrient are decided basing on species and edaphic condition. In this study, four fertilizer applications were used at planting; 100 g NPK+200 g compost, 150 g NPK+150 g compost, 200 g NPK+100 g compost, and control (no fertilization) for Eucalyptus urophylla plantation grown in North Central and Southern, Vietnam with planting density of 1,330 trees ha-1 (spacing 2.5 × 3 m). Growth data were collected after planting three years. Fertilizer applications had significant effects on diameter at breast height (DBH), crown diameter (Dc), and dry biomass of 3-year-old plantations in both sites. A 3-year-old. E. urophylla plantation had largest DBH (9.7 cm) and dry biomass (67.2 Mg ha-1) in fertilizer application of 200 g NPK+100 g compost in Southern site, and smallest DBH (6.4 cm) and dry biomass (38.2 Mg ha-1) in control also in Southern site. Comparing between two sites at three treatments with fertilizer indicated the significant higher dry biomass in Southern site than that in North Central site. While, it was converted in control, indicating higher dry biomass in North Central site. To grow E. urophylla , 200 g NPK+100 g compost should be applied at planting for Southern site. While, 100 g NPK+200 g compost is encouraged for North Central site.
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机译:施肥已被广泛用于增加和维持人工林的生产力,特别是在贫瘠的土壤中。氮,磷,钾和堆肥在越南通常用于人工林。根据种类和营养条件决定肥料的用量和相关养分的比例。在这项研究中,种植时使用了四种肥料。 100 g NPK + 200 g堆肥,150 g NPK + 150 g堆肥,200 g NPK + 100 g堆肥并控制(不施肥)在越南中北部和南部种植的尾叶桉(Eucalyptus urophylla)人工林,种植密度为1,330公顷sup> -1 sup>(间距2.5×3 m)。种植三年后收集生长数据。施肥对这两个地点的3年生人工林的胸高直径(DBH),冠径(D c sub>)和干生物量都有显着影响。 3岁。在南部地区,施肥200 g NPK + 100 g堆肥时,尾叶桉人工林的最大胸径(9.7 cm)和干燥生物量(67.2 Mg ha -1 sup>)和最小的胸径(6.4 cm)南部地区的干生物量(38.2 Mg ha -1 sup>)也处于控制状态。三种肥料处理的两个地点之间的比较表明,南部地点的干生物量显着高于北部中部地点。同时,它在控制下进行了转化,表明中北部地区的干生物量较高。为了种植尾叶埃希氏菌,应在种植南方地区时使用200 g NPK + 100 g堆肥。同时,鼓励在中北部地区使用100克NPK + 200克堆肥。
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