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INFLUENCE OF DIFFERENT ORGANIC NUTRIENT SOURCES ON OKRA (Abelmoschus esculentus L.)

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Title INFLUENCE OF DIFFERENT ORGANIC NUTRIENT SOURCES ON OKRA (Abelmoschus esculentus L.)
 
Creator ALEKHYA JOHN, D
 
Contributor PRABHU PRASADINI, P
 
Subject composting, nutrients, organic fertilizers, fertilizers, yields, planting, fruits, crops, carbon, vegetables
 
Description Organic nutrient sources namely New Suryamin, Aishwarya, EM compost and
Urban compost were analyzed in the laboratory with standard procedures. The results
revealed that the New Suryamin was slightly acidic in reaction with a pH of 6.59, EC was
1.21 dS m-1 and total organic carbon content was 3.59 per cent. Total N, P and K contents
of New Suryamin were 1.27, 1.08 and 0.57 per cent, respectively. Aishwarya was slightly
acidic in reaction with a pH of 6.64, EC was 6.3 dS m-1 and organic carbon content was
26.4%. Total N, P and K contents of Aishwarya were 0.67, 1.20 and 1.22 per cent,
respectively. The analysis of EM compost indicated that the pH was 5.71, EC was 1.71 dS
m-1 and organic carbon was 15.8 per cent. Total N, P and K contents of EM compost were
0.7, 1.19 and 0.24 per cent, respectively. The analysis of Urban compost indicated that the
pH was 7.37, EC was 0.56 dS m-1 and organic carbon content was 23.46 per cent. Total N,
P and K contents of urban compost were 0.87, 1.20 and 0.45%, respectively.
A field experiment was conducted to study the effect of organic nutrient sources
viz., New Suryamin, Aishwarya, EM compost and Urban compost in comparison to
inorganic fertilizers on soil properties, crop growth, nutrient uptake, yield and fruit quality
of okra. The treatments consisted of T1 (control), T2 (RDF - Inorganic N, P and K @ 120
kg ha-1, 60 kg ha-1 and 60 kg ha-1, respectively), T3 (New Suryamin @ 50 kg ha-1), T4 (New
Suryamin @ 25 Kg ha-1 + 50% RDF), T5 (Aishwarya @ 120 Kg ha-1), T6 (Aishwarya @ 60
Kg ha-1 + 50% RDF), T7 (EM compost @ 5 t ha-1), T8 (EM compost @ 2.5 t ha-1 + 50%
RDF), T9 (Urban Compost @ 5 t ha-1) and T10 (Urban Compost @ 2.5 t ha-1 + 50% RDF).
Inorganic N, P and K were supplied through urea, single super phosphate and muriate of
potash.
Organic nutrient sources were applied as per the treatments. The first set of plants
were collected at 30 DAS, second set at 45 DAS and third set at 90 DAS (fruiting stage)
and soil samples were collected at 30 DAS and 90 DAS. Plant parameters like plant height
and leaf area were recorded at 45 and 90 DAS, whereas chlorophyll content was recorded
xiv
only at 45 DAS. Number of fruits per plant and pod yield were recorded over 15 pickings.
The plant samples were anlysed for N, P and K. Fruit samples were analysed for ascorbic
acid content. Soil samples were analysed for pH, EC, OC, available N, P and K and
microbial properties.
At 30 DAS, the highest dry matter production was recorded in T10 (Urban compost
+ Inorganic NPK) with 78.4 kg ha-1. At 45 DAS, the highest plant height and dry matter
were recorded in T6 (Aishwarya + Inorganic NPK). At 90 DAS, both plant height and dry
matter were highest in the treatment where combination of organics and inorganic sources
were used i.e., in T8 (EM compost + Inorganic NPK) followed by T10 (Urban comost +
Inorganic NPK). The primary nutrients uptake was recorded highest by T10 (Urban compost +
Inorganics NPK) at 30 DAS and by T6 (Aishwarya + Inorganic NPK) at 45 DAS and by T8 (EM
compost + Inorganic NPK) at 90 DAS.The highest pod yield was recorded by T8 (EM compost
+ Inorganic NPK) with 5.7 t ha-1. The highest ascorbic acid content, a fruit quality
parameter, was recorded in T8 (EM compost + Inorganic NPK) with 13.67 mg of ascorbic
acid per 100 g of the sample.
There was no significant variation in pH and EC of soil samples at both the stages
among different treatments but the variation was significant in EC at 30 DAS. At 30 DAS
and 90 DAS the highest organic carbon was observed in T9 (Urban compost) with 1.63%,
1.21% followed by T10 (Urban compost + Inorganic NPK) with 1.58% at 30 DAS and by
T5 (New suryamin) with 1.16% at 90 DAS. At 30 and 90 DAS the soil organic carbon
content in the treatment with inorganic NPK alone (T2) was 1.10 and 0.94%, respectively.
The highest soil microbial load was found in T9 (Urban compost) at both the stages
which provided the highest per cent of organic carbon. Both bacterial load and fungal load
were highest in this treatment. In the treatment with inorganic NPK (T2) there was a
decrease in bacterial load from vegetative (25 x 109 CFU g-1) to fruiting stage (23 x 109
CFU g-1) and in T9 (Urban compost) from 58.6 x 109 CFU g-1to 45.6 x 109 CFU g-1. The
highest fungal load was recorded in T9 (Urban compost) at both the stages of the crop
growth with 40.6 x 104 and 77.3 x 104 CFU g-1 at vegetative and fruiting stages,
respectively.
The above study indicated that the application of organic fertilizers either alone or
in combination with inorganics is highly beneficial from the view of nutrient availability
and microbial activity of soils; plant parameters and yield of okra. EM compost with
inorganic NPK (T8) recorded highest yield and ascorbic acid content. Urban compost with
inorganic NPK (T10) recorded highest in soil N, P and K contents.
The study suggested that urban compost, prepared from urban solid waste and EM
compost prepared from industrial sludge in combination with inorganics could be utilized
for vegetable production as an integrated nutrient management practice.
 
Date 2016-06-23T10:42:35Z
2016-06-23T10:42:35Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67810
 
Language en
 
Relation D9150;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY