Nitrogen Response Behaviour of Developed Promising Lines of T.Aman Rice

Abstract

Nitrogen is the most limiting nutrient for rice. Modern high yielding rice varieties may have differences in accumulating and using N from soil and applied fertilizer. A field experiment with 8 rice genotypes was conducted during 2008 wet season (T.Aman season) to study the effect of different rates of N fertilization on the yield performance and nitrogen nutrition under irrigated condition. Among the tested varieties/lines, BR7155-20-1-3 produced the significantly highest grain yield of 5.04 t/ha at N30 level followed by Swarna (4.66 t/ha) at the same level of N with similar growth duration (140 days). Agronomic efficiency of added N ranged from 0.7 to 23.3 for the promising line   BR7155-20-1-3 and 3.3 to 27.0 for variety Swarna. Grain yield at No was the highest in BR7155-20-1-3 followed by the variety Swarna and the lowest in BR7870-5 *(Nils)- I 0-HR8. Percent nitrogen recovery ranged from 50 to 63 for variety Swarna and 13 to 30 for promising line BR7155-20-1-3. The promising line BR7155 20-1-3 and the variety Swarna may be economically advantageous over the other varieties/ lines.

DOI: http://dx.doi.org/10.3329/bjar.v37i2.11222

Bangladesh J. Agril. Res. 37(2): 207-213, June 2012