Hiệu quả của hai dòng vi khuẩn cố định đạm và hòa tan lân lên sinh trưởng và năng suất lúa IR 50404 tại xã Hiếu Nhơn, huyện Vũng Liêm, tỉnh Vĩnh Long

Abstract

A green-house and a field trial were carried out to determine the effects of nitrogen fixing bacteria and phosphate-solubilizing bacteria on the growth and yield of IR50404 rice cultivar. The results from the green-house showed that either treatments inoculated with individual bacterial strain (nitrogen fixing or phosphate solubilizing bacteria) in a combination with a reduction of inorganic nitrogen and phosphate fertilizer or inoculated with both strains with a reduction of inorganic nitrogen and phosphate fertilizer had plant height, root length, dry weight (DW) of plants and DW of roots similar to those of treatment applied with 100% recommeded dose of N and P2O5 without bacterial inoculation. The results from the field experiment showed that either treatments inoculated with individual strain in a combination with a reduction of inorganic nitrogen and phosphate fertilizer or inoculated with both strains with a reduction of inorganic nitrogen and phosphate fertilizer had plant height, root length, DW of plants, DW of roots, length of panicle, number of panicle/m2, filled grain percentage and DW of rice straw and grain yield similar to those of treatment with full nitrogen and phosphate dose application without bacterial innoculation. Rice inoculated with both bacterial strains together with 50%N and 50% P2O5 helped rice growth better and increased 5.9% of rice yield as compared to those of the treatment received full dose application of nitrogen and phosphorous fertilizers.