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INTEGRATED NUTRIENT MANAGEMENT FOR OPTIMIZING POTASSIUM REQUIREMENT IN HYBRID RICE

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Title INTEGRATED NUTRIENT MANAGEMENT FOR OPTIMIZING POTASSIUM REQUIREMENT IN HYBRID RICE
 
Creator SUBHA LAKSHMI, C
 
Contributor PRATAP KUMAR REDDY, A
 
Subject rice, crop residues, fertilizers, organic fertilizers, application methods, grain, developmental stages, nitrogen, yields, crops
 
Description The present investigation entitled “Integrated nutrient management for
optimizing potassium requirement in hybrid rice” was carried out during kharif
seasons of 2009 and 2010 at College Farm, College of Agriculture, Rajendranagar. The
soil of the experimental site was sandy clay loam in texture with pH of 7.9, medium
organic carbon content, low in nitrogen, medium in phosphorus and high in potassium
status. The experiment was laid out in split plot design replicated thrice with organic
sources [M1 - No organic manuring (control), M2 - subabul incorporation @ 5 t ha-1,
M3 - rice straw incorporation @ 2.5 t ha-1] assigned to main plots and six N:K2O
kg ha-1 fertilizer levels [F1-150:75; F2-175:50; F3-175:25; F4-200:50; F5-200:25;
F6-225:0] to sub plots.
Growth characters of rice viz. plant height, leaf area index, dry matter
production was higher with incorporation of organic sources when compared to control
(no organic manuring). Among the two organic sources, subabul green leaf manuring
@ 5 t ha-1 recorded the highest plant height, leaf area index, tillers m-2 and dry matter
production at all stages of crop growth. Yield attributes (panicles m-2, filled grains
panicle-1, panicle weight, grain weight panicle-1 and panicle length), grain and straw
yield were also higher with incorporation of subabul @ 5 t ha-1. Spikelet sterility was
the lowest with subabul green leaf manuring @ 5 t ha-1. The effect of organic sources
on thousand grain weight was found non-significant. N, P, K uptake and available soil
N P K status was also the highest with subabul incorporation @ 5 t ha-1. Grain quality
characteristics viz. milling percentage and head rice recovery were also the highest with
this treatment, however length to breadth (L/ B) ratio of grain was not influenced by
addition of organic sources.
Fertilizer level comprising of 200:50 N:K2O kg ha-1 recorded higher values of
growth parameters (leaf area index, tillers m-2, dry matter production), yield attributes
and yield. The next best treatment was 200:25 N:K2O kg ha-1. Plant height increased
with increasing level of nitrogen. Application of the highest dose of nitrogen 225:0
N:K2O kg ha-1 recorded the highest plant height. Test weight was not influenced by
fertilizer levels. Spikelet sterility was the lowest with 150:75 N:K2O kg ha-1 while the
highest value was with 225:0 N:K2O kg ha-1. The highest nutrient (N, P and K) uptake
was recorded by 200:50 N:K2O kg ha-1. Fertilizer level comprising 150:75 N:K2O
kg ha-1 recorded the lowest yield attributes, grain and straw yield. Nutrient uptake was
also the lowest in this treatment in both the years.
The interaction effect between organic sources and fertilizer levels was found
significant on yield components, grain yield and straw yield. Subabul green leaf
manuring @ 5 t ha-1 + 200:50 N:K2O kg ha-1 recorded the highest grain and straw yield
and remained on par with subabul green leaf manuring @ 5 t ha-1 + 200:25 N:K2O
kg ha-1 thus saving 25 kg K2O ha-1. Rice straw incorporation also helped in saving
25 kg K2O ha-1 when applied along with higher levels of nitrogen. Nutrient uptake
(N, P and K) was also the highest with subabul green leaf manuring @ 5 t ha-1+ 200:50
N: K2O kg ha-1.
Green leaf manuring with subabul @ 5 t ha-1 coupled with 200:50 N:K2O kg
ha recorded the highest gross returns of
66761,
71698 during 2009 and 2010
respectively while the highest net returns ( 41504, 46199) and benefit- cost ratio
(1.69 ,1.87) was obtained by subabul green leaf manuring @ 5 t ha-1 + 200:25 N:K2O
kg ha-1.
 
Date 2016-06-13T11:53:07Z
2016-06-13T11:53:07Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67247
 
Language en
 
Relation D9103;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY