tailieunhanh - Báo cáo lâm nghiệp: "phosphate fertilization on trace element nutrition pinaster grown in a sandy acid soil"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: phosphate fertilization on trace element nutrition pinaster grown in a sandy acid soil. | 690s Ann. Sci. For. 1989 46 suppl. 69ŨS-693S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Effect of phosphate fertilization on trace element nutrition of Pinus pinaster grown in a sandy acid soil E. Saur INRA Station d Agronomie . 33140 Pont-de-la-Maye France Introduction In the past 30 years phosphate fertilization has been widely used by foresters in Landes de Gascogne. During this same period several growth disturbances and malformations without pathological affections have appeared in pines and particularly in 3 yr old pines twisting of branches and leaders abundant fascicle shoots loss of apical dominance die-back of the top and production of unlignified tissues . The symptoms are similar to those described for other coniferous species in copper- or boron-deficiency conditions. The similarity of the symptoms and the very low trace-element contents in these sandy acid soils were consistent with a possible problem of micronutrient nutrition. Consequently we chose to study copper and boron in addition to zinc and manganese known or suspected to be involved in deficiency in agricultural plants grown on the same soil. The aim of this study was to evaluate the consequence of phosphate fertilization on the uptake of these 4 main trace elements. This paper reports 3 experiments in which all the trees were grown on the same sandy acid soil with a high organic matter content 1 seedlings 6 mo old under greenhouse conditions 2 juveniles 3 yr old under field conditions 3 adults 24 yr old under field conditions. Manganese zinc boron copper and phosphorus were measured in leaves adult and juvenile or in shoots seedling as indicators of the nutritional status. Materials and Methods Experiments Seedlings 6 mo old 4 treatments were replicated 5 times control 150 300 and 750 kg-ha-1 P2O5 triple superphosphate hectare was considered as 3 X 1 o6 kg of soil to accommodate the pot study . Each replicate consisted of kg of soil potted in a 5 I plastic pot with