EFFECTS OF DIFFERENT DOSES OF LIME ON SOIL CHEMICAL PROPERTIES AND YIELD PERFORMANCE OF BORO RICE (BRRI dhan28)

Abstract

A study was conducted in the experimental research farm of the Deparpartment of Soil Science, Hajee Mohammad Danesh Science & Technology University, Dinajpur, during January 2017 to May 2017 to evaluate the effects of liming on the yield and yield contributing characteristics of BRRI dhan 28 and the chemical properties of soil. Soil of the experimental field was sandy loam having pH 5.52, organic matter content 1.71%, total N 0.09%, available P 22.53 µg g -1 soil, exchangeable K 0.14 meq.100-1 g soil, available Ca 3.44 meq.100-1 g soil, Mg 0.62 meq.100-1 g soil, available S 14.97µg g -1 soil and available Zn 1.02µg g -1 soil. There were seven lime treatments viz.T0: Control, T1: 0.5 t ha-1 , T2: 1.0 t ha-1 , T3: 1.5 t ha-1 , T4: 2.0 t ha-l , T5: 2.5 t ha-1 and T6: 3.0 t ha-l . Dolochun [Ca Mg (CO3)2] was used as the liming material. The design of the experiment was Randomized Complete Block Design (RCBD) with three replications. Yield and yield components of rice were recorded at harvest and the grain and straw were analyzed for N, P, K, Ca and Mg contents. The post-harvest soils were analyzed for pH, total N, exchangeable K, available P, S, Ca, Mg, Zn and organic matter. The application of different doses of lime to soil progressively increased soil pH and availability of P, Ca and Mg contents in soil. The pH of the post harvest soils was positively correlated with available Ca and Mg status of soil. The grain yields of rice were positively correlated with soil pH, available P, Ca and Mg contents of soil. Plant height (cm), tillers hill-1 , panicle length (cm), grains panicle-1 , filled grain panicle-1 , unfilled grain panicle-1 , grain yield (t ha-1 ), straw yield (t ha-1 ) and biological (t ha-1 ) yield were significantly affected by different doses of lime. The highest grain yield 6.5t ha-1 was found in T6. The lowest grain yield 5.48 t ha-1 was recorded in T0 treatment. Total uptake of P, K, S, Ca and Mg content were significantly increased due to application of lime which ultimately increased rice yield. The results of this study showed that liming is necessary for rice cultivation in the Ranishankail soil series of Dinajpur. The application of 3.0 t lime ha-l appears to be optimum dose for desired soil pH of rice cultivation (>pH 6.0), the availability of nutrients and finally increased rice yield. Further research may be carried out on the effects of liming in different cropping patterns in famers‟ fields