Abstract:
A field experiment was conducted at SAU farm, Dhaka from August to
November 2007 to find the effects of different sources and management of
N on that growth and yield of T. aman rice (cv. BR 11). The soil was silt
loam having p1-1
5.4, organic matter
1.75%,
available P 8.0 gg g
1,
available S 9.6 ig g' and K 0.11 meq/100g contents. There were nine
treatments taking various doses of urea, USG and vermicompost viz. T
o:
control, T
1
: 120 kg N from urea, 12
: 100 kg N from urea+ 20 kg N from
vermicompost, T
3
: 80 kg N from urea + 40 kg N from vermicompost,
T4:
5
: 120 kg N from
USG, T
6:
103.5 kg N from USG + 16.5 N from vermicompost, 1
60 kg N from urea + 60 kg N from vermicompost, T
7: 69 kg N
from USG + 51 N from vermicompost and T
8
: 45 kg N from USG + 75 N
from vermicompost. The treatments were laid out in a randomized
complete block design with four replications. Recommended doses of P, K,
S and Zn were applied to all plots. The application of urea, USG and
vermicompost had a significant positive effect on the plant height, panicle
length and grains panicle". The highest grain (4.85 t hi) and straw (6.92 t
hi') yields of rice were recorded in the T treatment. The T
o (control)
treatment gave the lowest grain (2.56 t hi') and straw yields (3.97 t hi').
The application of urea, USG and vermicompost significantly increased
the N, P. K and S contents as well as their uptake by the crop. Overall
results indicate that the application of urea at a recommended rate i.e. 120
kg N hi' along with recommended rate of P. K, S and Zn is necessary for
obtaining higher grain yield as well as straw yield of T. aman rice in SAU
farm soil and also in the areas having similar climatic, land and soil
characteristics.
