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LONG TERM EFFECT OF CULTIVATION AND MANAGEMENT PRACTICES ON HUMIC FRACTIONS, SOILS PROPERTIES, YIELD AND NUTRIENT UPTAKE BY ONION IN MAIZE ONION CROPPING SYSTEMS

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Title LONG TERM EFFECT OF CULTIVATION AND MANAGEMENT PRACTICES ON HUMIC FRACTIONS, SOILS PROPERTIES, YIELD AND NUTRIENT UPTAKE BY ONION IN MAIZE ONION CROPPING SYSTEMS
 
Creator THANDAVA KRISHNA, J
 
Contributor CHANDRASEKHAR RAO
 
Subject organic fertilizers, acidity, farmyard manure, crops, fertilizers, organic acids, enzymes, nitrogen, potassium, research methods
HUMIC FRACTIONS, ONION, MAIZE, CROPPING SYSTEM
 
Description The present investigation entitled “Long term effect of cultivation and management
practices on humic fractions, soil properties, yield and nutrient uptake by onion in maizeonion
cropping system” was carried out during the rabi season of 2008.
The project was initiated during kharif 2003. The initial soil sample before the start of
experiment i.e., during 2003 was collected and analyzed for physico-chemical and
chemical properties. The physico-chemical analysis revealed that the soil pH and EC were
7.6 and 0.55 dSm-1. Soil organic carbon content was 3.6 g kg-1. The available phosphorus
and potassium content were 24.0 kg ha-1and 293.0 kg ha-1.
There were no significant change in soil bulk density, pH and EC. The soil bulk
density varied from 1.37 Mg m-3 (T6) to 1.47 Mg m-3 (T7) both at zero days and harvest.
The bulk density was higher in inorganic fertilizer applied treatments and lower in purely
organic manures applied treatments. After six years of the experiment the pH was slightly
increased in all the treatments expect treatment receiving both organic and inorganic
sources to supplement equally that recommended dose of nitrogen and EC (0.26 dSm-1 to
0.32 dSm-1) was slightly decreased in all the treatments. There was build up in the organic
carbon content status of the soil due to application of the both organics and inorganics
continuously for six years from 3.6 g kg-1 to 7.5 g kg-1.
There was build up in the available P and K status of the soil due to the application of
organics and inorganics continuously for six years from 24.0 kg ha-1 and 293.0 kg ha-1 to
44.4 kg ha-1 and 372.1 kg ha-1 in the treatment receiving both organic and inorganics
sources supplement equally that recommended dose of N at zero DAT. The available N, P
and K were increased up to 60DAT and the decreasing trend was observed later stages of
the crop growth up to harvest. Similar results were also find in inorganic nitrogen Fractions
i.e., ammoniacal and nitrate nitrogen and potassium fractions i.e., water soluble and
exchangeable potassium.
The enzyme activity (dehydrogenase, acid and alkaline phosphates and urease) was
increased up to 60 DAT and decreasing trend was observed later stages of crop growth
upto harvest. The increased activity of enzymes at 60 DAT could be attributed to increased
root rhizosphere, increased microbial growth and thus contributing to increased activity.
The enzyme activity decreased at harvest and was close to initial values. These could be
due to reduction in extracellular enzymes and cell debris.
The higher content of humic acid was recorded as compared to fulvic acid. The
content of humic acid and fulvic acid in the soil increased with increasing levels of organic
manures. The organic manures during decomposition first produce lower weight of fulvic
acids and these fulvic acid fractions polymerized and form higher weight of humic acids
these resulting higher amount of humic acids. Total acidity and carboxyl groups and
phenolic – OH groups were more in fulvic acids as compared with humic acids. These
were non – significant. The non – significant variation in the properties of humic
substances indicated that these properties are inherent and are not influenced by
management practices. However there could be decrease in the content of humic
substances as a whole.
The bulb and stover yields of onion varied from 71.14 q ha-1 to 96.76 q ha-1 and 13.31
q ha-1 to 24.26 q ha-1. The N, P and K uptake by onion was varied from 10.1 kg ha-1 to 17.5
kg ha-1, 1.92 kg ha-1 to 4.02 kg ha-1 and 29.5 kg ha-1 to 39.5 kg ha-1. Fifty percent
recommended dose of N P K plus 50 percent N as FYM treatment recorded highest yield
and organic manure applied treatment recorded higher yield than only inorganic sources
recommended fertilizers applied treatments.
 
Date 2016-06-01T15:24:55Z
2016-06-01T15:24:55Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66579
 
Language en
 
Relation D8911;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY