Báo cáo lâm nghiệp: production in an irrigation and tilization field experiment with Eucalyptus globulus Aboveground biomas

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: production in an irrigation and tilization field experiment with Eucalyptus globulus Abovegroundbiomass...
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Báo cáo lâm nghiệp: " production in an irrigation and tilization field experiment with Eucalyptus globulus Aboveground biomas" fer- production in an irrigation and biomassAbovegroundtilization field experiment with Eucalyptus globulus 3 Flower-Ellis 1 L. Leal M. ToméC. Araújo J.S. Pereira 2 J. 1 3ricssonT. Ericsso1 CELBI (Cellulose Beira Industrial), Figueira da Foz, Portugal,2 I’ortugal, and Instituto Superior de Agronomia, Dept of Forestry, P-1399 Lisbon,3 Swedish University of Agriculture Sciences, Uppsala, Sweden 32 P plus micronutrients. Fertilizers containingIntroduction 90 kg/ha and 1 kg/ha of N were applied in 0 6 1986 and 1987, respectively. 2) I - water sup-For a given climate, optimal growth rates plied daily from April through October, throughmay be achieved if mineral nutrient addi- drip tubes. In 1986 and 1987, 611 and 629 mm of water were supplied by irrigation in additiontions are scheduled to meet the needs of to 645 and 905 rnm of rainfall in 1986 and 1987,the plants determined by their relative respectively. 3) IL irrigation as in I plus a -growth rate (Ingestad, 1988). To assess complete liquid fertilizer, with micronutrients,optimum biomass production of Eucalyp- applied once per week according to the needs of the plants estimated by the relative growthtus globulus in Portugal and to study the rate. The total fertilizer supplied was, in kg/ha,physiological mechanisms of the response 60 N, 46 K and :?6 P in 1986 and 160 N, 123 Kto the addition of nutrients and water, a and 69 P in 1987. Each treatment was appliedfield experiment was established in March to 2 plots with an area of 0.30 ha each, leaving1986 (Pereira et al., 1988). In this paper, 2 protection rows between plots. Twelve trees per treatment were harvestedwe present the results of aboveground for biomass studies in September of 1986 andbiomass production and partitioning for February of 1987. In February of 1988, 10 treesthe 1 st 2 yr of growth. per treatment were selected for the same pur- pose. Biomass components were separated and a subsample of each component was oven- dried at 80°C to evaluate the dry weight to freshMaterials and Methods weight ratio and estimate biomass.Planting took place in March of 1986 at a spac-ing of 3 x 3 m. At planting, each seedling re- Resultsceived 200 g of NPK fertilizer containing 14 g N,18.3 g P and 11.6 g K. The experimental designconsisted of 3 treatments and a rainfed control As shown in Table I, the treatments(C). 1) F solid fertilization applied twice per - strongly affected growth especially in thegrowing season (in spring and autumn) to rain- irrigated treatments (IL and I). During thefed plots. The fertilization consisted of a broad- first 6 mo, the effect of F was negligible,cast fertilizer, with the proportions 100 N: 88 K: compared to the control (C), whereas,asin IL and I, the aboveground biomass was262 and 185% greater than in C. That wasa period when water stress occurred inthe rainfed plots (F a ...