EFFECTS OF DIFFERENT DOSES OF UREA AS BALL PLACEMENT AND BROADCAST ON YIELD AND NUTRIENT CONTENT OF T. AMAN RICE (Oryza saliva L.)

Abstract

The most important problem in achieving high yields in rice is how to increase the nitrogen (N) absorption at each growth stage. Modified forms of fertilizer application could reduce N losses and increase fertilizer use efficiency while cost of production is also reduced and yield is increased. In order to avoid losses and to use fertilizer nitrogen efficiently. it is necessary to develop better ways of predicting the optimum froms of N needed by the rice plants. A field experiment was conducted at Sher-e-Bangla Agricultural University (SAU) farm. Shcr-e-I3angla Nagar. Dhaka. Bangladesh during the period of June to December. 2011 to study the effect of urea super granule on yield and nutrient content of ii aman rice. BRRT dhan 40 was used as the test crop in this experiment. The experiment was laid out in randomized complete block design (RCBD) with the replications. There were seven treatments viz., To (control). T1 (37.5 kg ha4 urea as ball placement), T2 (56.25 kg hi' urea as ball placement). 1'3 (75 kg hi' urea as ball placement), T4 (37.5 kg ha1 urea as broadcast). T5 (56.25 kg ha4 urea as broadcast) and T6 (75 kg ha4 urea as broadcast). There was a positive impact of urea ball placement on yield, yield parameters and nutrient contents ofT. anian rice variety BRRI dhan40 with increasing rate of urea. Due to the effect of urea super granule. maximum grain yield (7.04 t ha4) was observed in T3 (75 kg hi' urea as ball placement) treatment. Plant height. number of filled and unfilled grain panicic'. effective and non-effective tiller hilr'. panicle length, and straw yield was the highest in 75 kg ha4 urea as ball placement and lowest in control treatment. The experimental result showed that application of 75 kg urea super granule as ball placement produced the highest effects on all yield and yield parameters and nutrient content.