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EFFECT OF NUTRIENT INTEGRATION ON INTENSITY OF MAJOR RICE INSECT PESTS UNDER TRANSPLANTING SITUATION

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Title EFFECT OF NUTRIENT INTEGRATION ON INTENSITY OF MAJOR RICE INSECT PESTS UNDER TRANSPLANTING SITUATION
 
Creator Tiwari, Prem Shanker
 
Contributor Sharma, Sanjay
 
Subject Agricultural Entomology, fertilizers, rice, land resources, nitrogen, planting, animal developmental stages, yields, biological phenomena, silica, developmental stages
 
Description The insect pest pose major devasting threat to agricultural productivity. The morphometric studies of insect pests under different treatments revealed that
NPK doses @ 150%NPK (T4) favored highest growth and development of insect pest in
terms of larval length and weight. Maximum leaf folder length (9.18mm), weight (32.03mg)
and leaf area damage (79%); stem borer length (10.76mm), weight (55.13mg) and tunnel
length (7.10cm); minimum BPH probing marks (8.88probes) and maximum honeydew
secretion (176.38mm2) was recorded for the treatment received 150%NPK. Minimum leaf
folder larva length (7.39mm), weight (12.68mg) and leaf area damage (26.60%); stem borer
length (7.72mm), weight (33.44mg) and tunnel length (2.72cm); BPH higher probing marks
(16.38probes) and lowest honeydew secretion (65.75mm2) was recorded for the treatment
received 50%NPK+Green manuring.
The impact of organic and inorganic fertilizers application was assessed for the
presence of natural enemies‘ population under different treatment plots. It is revealed that
higher NPK doses @ 150%NPK (T4) favored the higher natural enemy population as
compared to lower dose @ 50%NPK (T2) and organic plots which was provided Gm (T10),
BGA (T9) and Zinc (T5). The density of pest insect were also higher in these plots that`s why
the natural enemies were observed in higher number. Application of 150%NPK (T4) had
resulted highest population of spider (3.25/3sweeps), coccinellids (1.29/3sweeps), dragon
flies (3.0/3sweeps), damsel flies (3.33/3sweeps), and staphylinid beetle (1.79/3sweeps)
followed by 100%NP (T6) recorded spider (2.29/3sweeps), coccinellids (1.0/3sweeps),
dragon flies (2.13/3sweeps), damsel flies (2.17/3sweeps) and staphylinid beetle
(1.54/3sweeps).
The farmer field survey revealed that overall 40% farmers used nitrogenous fertilizer
along with phosphorous and 30% farmers had used recommended NPK doses ,only 10% used
combination of organic and inorganic fertilizers and 20% farmers had used more than the
xviii
recommended dose of inorganic fertilizers . Among the farmer fields 48.75% fields have high
pest incidence and 30% fields have moderate pest incidence, 10% farms and 11.25% farms
recorded lower and extreme pest incidence respectively. The 80% farmers had obtained
average yield from rice crop, followed by more than average yield (14.60%), while only 5.41
per cent respondents had obtained lower than average yield of rice. The yield was found
positively correlated with fertilizer level and pest incidence and there is a positive correlation
was found between fertilizer level and pest incidence.
The soil and plant silica analysis at harvesting stage of crop revealed that treatment
with green manuring (T10) and BGA (T9) recorded higher silica content i.e. 90.37% and
88.51% in soil and 8.52 and 8.25% in plant respectively. However the silica content was
estimated 86.99% in soil and 5.54% in plant under 150%NPK (T4) treated plot where
intensity of pest was recorded. The pest incidence (i.e. dependent variable) was found
negatively correlated with the available silica percent (i.e. independent variable) in soil and
plant sample.
 
Date 2016-06-03T12:01:44Z
2016-06-03T12:01:44Z
2016
 
Type Thesis
 
Identifier 173p
http://krishikosh.egranth.ac.in/handle/1/66705
 
Language en
 
Format application/pdf
 
Publisher Indira Gandhi Krishi Vishwavidyalaya, Raipur CG