Green Global
Foundation   Journal
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INFLUENCE OF SUPPLEMENTAL PHOSPHORUS ON THE CHANGES IN PHOSPHORUS FRACTIONS OF RICE GROWING SOIL UNDER ACIDIC CONDITION (Pages : 37 - 43)

A study on pot experiment were conducted from December, 2014 to May, 2015 in the net house of the Department of Soil Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur to evaluate the effect of supplemental phosphorus on the changes in phosphorus fractions of rice growing soil under acidic condition and its effect on rice (BRRI dhan28). Two soil samples were collected from different places of two Agro-Ecological Zones (AEZs) of Bangladesh. The two places are Hajee Mohammad Danesh Science and Technology University (HSTU) farm (Old Himalayan Piedmont Plain) and Farmer’s field Kushdha (North Eastern Barind Tract). There were two treatments in this experiment e.g. control and P amendment (200 mg kg-1). The treatments were replicated thrice. The texture of HSTU farm and Kushdaha soils were sandy loam and silty clay, respectively. The range of pH and organic matter content were 4.22 to 5.01 and 1.45 to 1.76%, respectively. The initial status of labile P, Fe/Al-P and Ca/Mg-P of the different soils were 5.53 to 14.94, 48.40 to 86.50 and 59.65 to 51.45 mg Kg-1, respectively. Due to cropping, a remarkable depletion was found in post-harvest soils in non-treated pots and the depleted amount ranged from 13.65 to 28.73, 1.46 to 8.33 and 0.63 to 2.87% for labile P, Fe/Al-P and Ca/Mg-P, respectively over the initial status. In treated pots, the depletion of labile P, Fe/Al-P and Ca/Mg-P varied from 1.96 to 4.10, 0.95 to 5.01 and 0.35 to 1.97 mg Kg-1, respectively. The percent use efficiency of labile P, Fe/Al-P and Ca/Mg-P in treated pots were 61.57 to 745.45, 28.19 to 92.40 and 10.17 to 42.27%, respectively. Application of P increased the dry matter yield of rice in all the selected soils. The contribution of Fe/Al-P on P uptake was higher in acid soils and Ca/Mg-P in nearly neutral soils.Download