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NITROGEN MANAGEMENT FOR SEMI-DRY RICE (Oryza sativa L.)

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Title NITROGEN MANAGEMENT FOR SEMI-DRY RICE (Oryza sativa L.)
 
Creator JHANSI LAKSHMI BAI, K.
 
Contributor RAMANA MURTHY, K.V
 
Subject NITROGEN, MANAGEMENT, SEMI-DRY, RICE
 
Description An investigation was conducted on “Nitrogen Management for Semi-dry Rice
(Oryza sativa L.)” at Agricultural College Farm, Naira during Kharif 2011. The experiment
was laid out in split plot design and it was replicated thrice. Treatments mainly comprised of
four graded levels of nitrogen [N1 (60 kg N ha-1), N2 (80 kg N ha-1), N3 (100 kg N ha-1), N4
(120 kg N ha-1)] assigned to main plots and five varied timings of nitrogen application [T1 (1⁄3
at basal + 1⁄3 at active tillering + 1⁄3 at panicle initiation), T2 (1⁄4 at basal + 1⁄4 at active tillering +
1⁄4 at panicle initiation + 1⁄4 at flowering), T3 (1⁄4 at basal + 1⁄2 at active tillering + 1⁄4 at panicle
initiation), T4 (1⁄4 at basal + 1⁄4 at conversion to wet + 1⁄4 at panicle initiation + 1⁄4 at flowering),
T5 (LCC based application)] allotted to sub plots. The test variety was Vasundhara (RGL
2538).
Application of 120 kg N ha-1 resulted in highest stature of growth parameters viz.,
plant height, total number of tillers m-2, Leaf Area Index (LAI) and dry matter production and
yield attributes viz., total number of panicles m-2, total number of grains and filled grains
panicle-1 and yield as well as the highest nutrient uptake (N, P and K) and it was significantly
superior to other graded levels of nitrogen. All the growth parameters as well as yield
attributes, yield and nutrient uptake (N, P and K) of rice were the lowest with 60 kg N ha-1.
Time of nitrogen application exerted significant influence on the growth parameters
and nutrient uptake (N, P and K). The highest stature of all the above growth parameters viz.,
plant height, total number of tillers m-2, LAI, dry matter production and nutrient uptake (N, P
and K) was recorded with application of nitrogen based on Leaf Colour Chart based nitrogen
application at active tillering stage and it was significantly superior to rest of the timings of
nitrogen application studied. At panicle initiation stage, all these growth parameters as well as
nutrient uptake were noticed with nitrogen application in three splits 1⁄4 at basal + 1⁄2 at active
tillering + 1⁄4 at panicle initiation and it was on par with Leaf Colour Chart based nitrogen
application. Nitrogen application in three splits 1⁄3 each at basal, active tillering and panicle
initiation recorded the highest plant height, dry matter production and nutrient uptake (N, P
and K) at flowering stage and also with Leaf Colour Chart based nitrogen application and
both these treatments were on par with each other.
At harvesting stage, application of nitrogen in four splits 1⁄4 each at basal, conversion
to wet, panicle initiation and flowering recorded the highest stature of all the growth
parameters viz., total number of tillers m-2, Leaf Area Index (LAI) and dry matter production,
yield attributes and yield along with highest nutrient uptake (P and K) and nitrogen uptake by
grain + straw and it was at par with Leaf Colour Chart based nitrogen application and
nitrogen application in four splits 1⁄4 each at basal, active tillering, panicle initiation and
flowering.
The highest gross returns, net returns and B: C ratio were realized with 120 kg N ha-1
and the lowest economic returns were recorded with 60 kg N ha-1. With respect to timings of
nitrogen application, the highest gross returns, net returns and B: C ratio was realized with 1⁄4
each at basal, conversion to wet, panicle initiation and flowering and lowest economic returns
were obtained with 1⁄4 at basal + 1⁄2 at active tillering + 1⁄4 at panicle initiation.
The status of post harvest soil available nitrogen, phosphorous and potassium was not
significantly influenced either by graded levels of nitrogen or varied time of nitrogen
application.
From the study it can be concluded that under semi-dry situation rice can be
successfully grown with supply of 120 kg N ha -1 applied in four splits 1⁄4 each at basal,
conversion to wet, panicle initiation and flowering resulting in the highest productivity and
profitable monetary returns, without harming the soil fertility status.
 
Date 2016-06-29T11:01:23Z
2016-06-29T11:01:23Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68202
 
Language en
 
Relation D9175;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY