EFFECTS OF DIFFERENT DOSES OF ARSENIC LEVELS IN GROWTH AND YIELD OF RICE

Abstract

The pot experiment was conducted at the Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from December 2016 to March 2017 to study the effect of arsenic on growth and yield of rice. The experiment comprised of two factors. Factor A: Arsenic level (4 levels): A : Control (No arsenic); A 2 : 1 ppm As pot -1 , A 3 : 2 ppm As pot -1 and A 4 :4 ppm As pot -1 . Factor B: Nitrogen doses: (2 Nos.); T 1 : recommended dose of nitrogen; T : 50% more than recommended dose of N.The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. In case of arsenic, at harvest,the tallest rice plant (92.00 cm), highest effective tillers per plant (24.0), the largest panicle length (23.93 cm), the highest filled grain per plant (880.67) , the highest filled grain per panicle (43.66),the highest 1000-grain weight (28.26 g), the highest straw yield (28.10 g), the highest grain yield (28.00 g) were found in A 1 2 treated pot & the highest un-filled grain per panicle (36.00),the highest un-filled grain per plant (298.33) were found in A treated pot.The shortest rice plant (61.90 cm) , lowest effective tillers per plant (12.0) , smallest panicle length (11.48 cm),and lowest filled grain per plant (99.67), and lowest straw yield (8.3 g), lowest grain yield (13.00 g) were found in A 4 treated pot and lowest un-filled grain per plant (188.67),lowest un-filled grain per panicle (22.66) were found in A 4 treated pot and lowest filled grain per panicle (31.00),lowest 1000-grain weight (27.30 g) were found in A 1 treatment.In case of nitrogen, tallest rice plant(92.00), highest effective tillers(24.00), largest panicle length(23.93), , highest straw yield(28.10)were found in T 1 3 treatment & highest filled grain per plant(880.67) ,highest un-filled grain per plant(298.33), highest filled grain per panicle(43.66), highest un-filled grain per panicle(36.00) ,highest 1000-grain weight(28.26), highest grain yield(28.00) were found in T treatment.On the other hand ,shortest rice plant (61.90 cm), smallest panicle length (11.48 cm),lowest 1000-grain weight (27.30 g), lowest straw yield (8.3 g), lowest grain yield (13.00 g) were found in T 2 2 treatment & lowest effective tillers per plant (12.0), lowest filled grain per plant (99.67), lowest un-filled grain per plant (188.67), lowest filled grain per panicle (31.00),lowest un-filled grain per panicle (22.66) were found in T

treatment.Interaction effect of arsenic & nitrogen doses,highest plant height(92.00 cm), highest effective tillers per plant (24.0), largest panicle length (23.93 cm), highest filled grain per plant (880.67), highest straw yield (28.10 g) found in A 1 T . The highest filled grain per panicle (43.66),highest 1000-grain weight (28.26 g), highest grain yield (28.00 g) found in A 1 1 T .The highest un-filled grain per panicle (36.00), highest un-filled grain per plant (298.33) were found in A 2 4 T . On the other hand shortest rice plant (61.90 cm) , lowest effective tillers per plant (12.0) , smallest panicle length (11.48 cm), lowest straw yield (8.3 g), lowest grain yield (13.00 g) were found in A 4 T 2 2 & lowest un-filled grain per plant (188.67), lowest un-filled grain per panicle (22.66) found in A

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