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Characterisation and classification of soils in coastal ecosystem of Guntur District of Andhra Pradesh and their evaluation for rice suitability

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Title Characterisation and classification of soils in coastal ecosystem of Guntur District of Andhra Pradesh and their evaluation for rice suitability
 
Creator TANTUJA NANDY
 
Contributor PRASUNA RANI, P
 
Subject classification, soils, coastal, ecosystem, Guntur, District, Andhra Pradesh, rice
 
Description Eight soil profiles representing Pedapuluguvaripalem village of Guntur
district, Andhra Pradesh were selected and described for their site and
morphological features. Horizon wise soil samples were collected from each
profile and subjected to laboratory analysis to study the physical, physico-
chemical, and chemical properties. The soils were classified up to family level
as per USDA Soil Taxonomy (Soil Survey Staff, 2006). Suitability of the soils
for rice crop was evaluated using FAO framework (FAO, 1976).
The study area was qualified for semi-arid climate with distinct wet and
dry seasons. The profiles were derived from coastal marine sediments.
Topography of the place was mainly of plain topography. The colour of the
soils varied from dark gray to very pale brown. The texture varied from very
fine to coarse. The structure varied from single grained to angular blocky. The
physical constants like bulk density varied according to texture, whereas other
properties like water holding capacity, pore space, volume expansion, sticky
point and COLE followed the trend of clay.
The soils were neutral to strongly alkaline in reaction. The EC values
varied from 0.32 to 19.25 dSm-1. The CEC values varied from 3.91 to 38.64
cmol (p+) kg-1 in profiles 1, 2, 4, 5 and 6 and 3.86 to 10.59 cmol (p+) kg-1 in
profiles 3, 7 and 8. Calcium was dominant cation among the bases followed by
magnesium, sodium and potassium. Base saturation was variable in the A-B-C
profiles and varied from low to high in the A-C profiles. Silica and
sesquioxides followed positive and negative trends, respectively with clay. The
ESP varied from low to high (>15%). High ESP was recorded in profiles 1, 2,
4, 6, 7 and 8.
The nutrient status of the soils indicated that the soils were low in nitrogen,
medium to high in phosphorus and high in potassium, while the micronutrients
were mostly sufficient except zinc, which was found to be deficient in 88 per
cent of the soils. The dominance of smectite was confirmed by the high
CEC/clay ratio in all the profiles.
The soils were classified based on morphological, physical, physico-
chemical, mineralogical and meteorological data as per USDA Soil Taxonomy
2006)
Profile 1: Coarse loamy over clayey, smectitic, iso-hyperthermic,Vertic
Haplustepts
Profile 2: Coarse loamy, smectitic, iso-hyperthermic, Fluventic Haplustepts
Profile 3: Coarse loamy, smectitic, iso-hyperthermic, Typic Ustipsamments
Profile 4: Fine loamy, smectitic, iso-hyperthermic,Vertic Haplustepts
Profile 5: Clayey over loamy, smectitic, iso-hyperthermic, Udifluventic
Haplustepts
Profile 6: Fine loamy over sandy, smectitic, iso-hyperthermic, Typic
Haplustepts
Profile 7: Coarse loamy, smectitic, iso-hyperthermic, Typic Ustipsamments
Profile 8: Coarse loamy, smectitic, iso-hyperthermic, Typic Ustipsamments
The soils represented by profiles 1, 2, 3, 5, 7 and 8 were placed under
currently not suitable class (N1), while profiles 4 and 6 were classified under
marginally suitable class (S3) for production of rice crop due to very severe
and severe limitations respectively, of wetness, soil, fertility and / salinity and
alkalinity.
 
Date 2016-06-29T15:15:12Z
2016-06-29T15:15:12Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/68266
 
Language en
 
Relation D9036;
 
Format application/pdf
 
Publisher ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY