EFFECT OF DIFFERENT ORGANIC AND INORGANIC FERTILIZERS ON SOIL FERTILITY AND THE YIELD OF BORO RICE (BRRI Dhan29)

Abstract

A field experiment was carried out at the Research Field, Department of Soil Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during the period from December 2016 to May 2017 in Rabi season to evaluate the efficacy of different organic and inorganic fertilizers on soil fertility and the yield of Boro rice (BRRI Dhan29). The experiment was laid out in a Randomized Complete Block Design (RCBD) having eight treatments with three replications. The treatments were as follows; T0: Control, T1: 100% N75P12K45S9 (Recommended dose), T2: 50% NPKS + 6 t cowdung ha-1, T3: 75% NPKS + 3 t cowdung ha-1, T4: 50% NPKS + 6 t poultry manure ha-1, T5: 75% NPKS + 3 t poultry manure ha-1, T6: 50% NPKS + 6 t vermicompost ha-1 and T7: 75% NPKS + 3 t vermicompost ha-1 . The experimental soil belongs to the Old Himalayan Piedmont Plain (AEZ-1). The soil was sandy loam in texture having pH 5.97, organic matter content 0.98%, total N 0.05%, available P 11.21 ppm, exchangeable K 0.10 m.e.100 g-1 soil and available S 11.01 ppm. Application of organic and inorganic fertilizers resulted in a considerable influence on the properties of the post-harvest soils such as the highest pH (6.02) was recorded from T4 and T6, maximum levels of organic matter content (1.54%), total N (0.08%), available P (22.10ppm) and available S (16.51ppm) were found in T4, the highest exchangeable K (0.16) was observed in T6. At harvest stage the tallest plant (94.37 cm) and the greatest number of total tiller per hill (22.10) was recorded from T4 and the lowest was observed in T0 treatment. The longest panicle (26.48 cm), maximum number of total grain per plant (178.3), the highest weight of 1000 seeds (21.96 g), the maximum grain yield (10.33 t ha-1) and straw yield (15.67 t ha-1) was recorded from T4 treatment whereas the lowest number of effective tillers per hill (8.89) , the shortest panicle (18.21 cm), the minimum total grain per plant (102.4) , the lowest weight of 1000 seeds (17.10 g), the lowest grain yield (4.63 t ha-1) and straw yield (6.73 t ha-1) was observed from T0 treatment. Although the highest biological yield was recorded from T4 treatment but statistically similar result was found from T5 treatment. It was obvious that fertility of soil and yield of rice can be increased substantially with the judicious application of organic manure with chemical fertilizer. The findings of the study showed that the performance of the treatment T4 was the best among all treatments. This study recommends that amendment of soil with 50% NPKS + 6 t poultry manure ha-1 might be an efficient practice for achieving sustainable soil fertility and crop yield.