tailieunhanh - 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 Aboveground biomass. | 526s Ann. Sci. For. 1989 46 suppl. 526s-528s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Aboveground biomass production in an irrigation and fertilization field experiment with Eucalyptus globulus c. Araujo1 . Pereira2 L. Leal1 M. Tomé2 J. Flower-Ellis3 and T. Ericsson3 1 CELBI Cellulose Beira Industrial Figueira da Foz Portugal 2 Instituto Superior de Agronomia Dept of Forestry P-1399 Lisbon Portugal and 3 Swedish University of Agriculture Sciences Uppsala Sweden Introduction For a given climate optimal growth rates may be achieved if mineral nutrient additions are scheduled to meet the needs of the plants determined by their relative growth rate Ingestad 1988 . To assess optimum biomass production of Eucalyptus globulus in Portugal and to study the physiological mechanisms of the response to the addition of nutrients and water a field experiment was established in March 1986 Pereira eta . 1988 . In this paper we present the results of aboveground biomass production and partitioning for the 1st 2 yr of growth. Materials and Methods Planting took place in March of 1986 at a spacing of 3 X 3 m At planting each seedling received 200 g of NPK fertilizer containing 14 g N g p and g K. The experimental design consisted of 3 treatments and a rainfed control C . 1 F solid fertilization applied twice per growing season in spring and autumn to rain-fed plots. The fertilization consisted of a broadcast fertilizer with the proportions 100 N 88 K 32 p plus micronutrients. Fertilizers containing 90 kg ha and 160 kg ha of N were applied in 1986 and 1987 respectively. 2 I water supplied daily from April through October through drip tubes. In 1986 and 1987 611 and 629 mm of water were supplied by irrigation in addition to 645 and 905 mm of rainfall in 1986 and 1987 respectively. 3 IL irrigation as in I plus a complete liquid fertilizer with micronutrients applied once per week according to the needs of the plants estimated by the relative growth rate. .