INTEGRATED NITROGEN MANAGEMENT IN AEROBIC RICE
Loading...
Files
Date
2009
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
A field experiment was conducted during rabi,2008-2009 on sandy clay
loam soils of Tirupati campus (Southern Agro-climatic Zone of Andhra
Pradesh) of Acharya N.G. Ranga Agricultural University, to study the effect
of different integrated nitrogen management practices on growth and yield of
aerobic rice and to develop an efficient integrated nitrogen management
practice for aerobic rice. The study was laid out in randomized block design,
replicated thrice with ten treatments viz., control (No Nitrogen) (T1), 100% N
through fertilizer (T2), 25% N through FYM + 75% fertilizer N (T3), 50% N
through FYM + 50% fertilizer N (T4), 75% N through FYM + 25% fertilizer N
(T5), 100% N through FYM (T6), 25% N through NLM (Neem Leaf Manure)
+ 75% fertilizer N (T7), 50% N through NLM + 50% fertilizer N (T8), 75% N
through NLM + 25% fertilizer N (T9) and 100% N through NLM (T10).
Organic sources of N (FYM and NLM) were incorporated 15 days
before sowing. The test variety was NLR-145. Integrated nitrogen
management practices significantly influenced the crop growth characters
(plant height, leaf area index, number of tillers m-2 and dry matter production),
yield attributes (effective tillers m-2, number of total and filled grains panicle-1
and test weight), yield (grain and straw), nutrient uptake of aerobic rice and
post harvest soil fertility status.
Application of 100% N through fertilizer (T2) produced the tallest
plants, largest leaf area index, highest number of tillers m-2 and highest total
dry matter production, but it was on par with 25% N through FYM + 75%
fertilizer N (T3) and 25% N through NLM +75% fertilizer N (T7) at all the
stages of crop growth. Growth characters were found to be the lowest with
control (T1) at all the stages of crop growth.
Yield attributes viz., number of effective tillers m-2, number of total and
filled grains panicle-1 and test weight were found to be the highest with 100%
N through fertilizer (T2), which was however, comparable with 25% N
through FYM + 75% fertilizer N (T3) and 25% N through NLM + 75%
fertilizer N (T7). All the yield attributes were at the lowest with control (T1).
Supply of 100% N through fertilizer (T2) resulted in the highest grain
yield, which was however at par with 25% N through FYM + 75% fertilizer N
(T3) and 25% N through NLM + 75% fertilizer N (T7). The next best
treatments were 50% N through FYM + 50% fertilizer N (T4) and 50% N
through NLM + 50% fertilizer N (T8), which were on par with each other. The
lowest grain yield was recorded in the control plot (T1).
Straw yield of 100% N through fertilizer (T2), 25% N through FYM +
75% fertilizer N (T3) and 25% N through NLM + 75% fertilizer (T7) were
comparable and were significantly superior to rest of the treatments. The
lowest straw yield was obtained with control (T1).
The highest value of milling per cent and head rice recovery were
recorded with 100% N through fertilizer (T2), which was however at par with
25% N through FYM + 75% fertilizer N (T3) and 25% N through NLM + 75%
fertilizer N (T7), where as the lowest were observed in the control (T1).
The highest protein and amylose contents were recorded with 100% N
through fertilizer (T2), which was however comparable with all the nitrogen
management treatments. Non-supply of nitrogen (T1) resulted in the poor
quality of grain.
Uptake of nutrients was found to be the highest with 100% N through
fertilizer (T2), which was however, on par with 25% N through FYM + 75%
fertilizer N (T3) and 25% N through NLM + 75% fertilizer N (T7) at all the
stages of crop growth. The lowest nutrient uptake was recorded with
control (T1).
Post harvest soil fertility status was found to be significantly improved
with 100% N through NLM (T10), 100% N through FYM (T6), 75% N
through NLM + 25% fertilizer N (T9) and 75% N through FYM + 25%
fertilizer N (T5).
In conclusion, the investigation has revealed that the highest grain
yield of aerobic rice as well as net returns could be obtained with 100%
recommended N through fertilizer (260 kg ha-1) to aerobic rice on sandy clay
loam soils of Tirupati in Southern Agro-climatic Zone of Andhra Pradesh.
Recommended dose of nitrogen could be substituted up to 25 per cent with
organic sources as FYM (4477 kg ha-1) without any significant reduction in
yield as well as economic returns besides improvement in the soil fertility
status.
Description
Keywords
INTEGRATED, NITROGEN, MANAGEMENT, AEROBIC, RICE