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Organic carbon pools and available nutrient status in rice growing soils of Haryana

KrishiKosh

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Title Organic carbon pools and available nutrient status in rice growing soils of Haryana
 
Creator Gyawali, Chetan
 
Contributor Dahiya, D.S.
 
Subject Carbon, Rice, Fertilizers, Enzymes, Organic fertilizers, Organic soils, Crops, Sampling, Nutrients, Fractionation
 
Description An understanding of the dynamics of soil organic carbon as affected by farming practices is
imperative for maintaining the soil productivity and mitigating global warming. The management of
soil organic carbon pools is important for sustainable agriculture. Excessive use of chemical fertilizers
and meager use of organic sources of plant nutrients, crop residues and adoption of exhaustive ricewheat cropping system have resulted in depletion of available nutrients in rice growing soils of
Haryana. Analysis of 75 surface and sub-surface soil samples collected with the help of GPS across the
Kaithal, Kurukshetra and Karnal districts showed wide variation in soil organic carbon pools, soil
enzyme activities and status of available nutrients. Soil organic carbon was found to be in medium
status mostly (77%) in rice growing soils. The dissolved organic carbon, microbial biomass carbon,
light fraction carbon and heavy fraction carbon constituted the 0.75 to 4.69, 1.63 to 5.77, 3 to 18 and 67
to83 per cent of the total soil organic carbon content in rice growing soils of Haryana. Dehydrogenase
activity (23.9829 µg TPF/g soil/24 h) and Urease activity (50 µg NH4
+
-N/g/h) was found to be higher
in Kaithal district while alkaline phosphatase activity (126 µg PNP/g soil/h) was higher in Karnal
district. The rice growing soils of Haryana was found to be low in available nitrogen status while only
17% area was deficient in available phosphorus. The available potassium was found in medium to high
status but it was in decreasing trend and nearly 20% area of Kurukhsetra was deficient in available
potassium while available sulphur was found to be in high status in rice growing soils covering about
70% of the area. DTPA extractable micronutrients (Fe, Zn, Cu and Mn) in rice growing soils of
Haryana was found to be in sufficient to high status indicating that there is not a problem of
micronutrients deficiency in rice growing soils of Haryana. The available silicon in Kaithal,
Kurukshetra and Karnal district was found to be in high status. The available nitrogen, phosphorus,
potassium, sulphur, DTPA extractable micronutrients, silicon were highest in the surface soils and their
content decreased with the increase in soil depth. The variation in the soil organic carbon pools, soil enzymes
and available nutrients was observed due to variation in management practices by farmers in rice growing
soils of Haryana. The soils of rice growing areas under study, in general, were alkaline in reaction, non –
saline, normal in bulk density and loamy sand to clay loam in texture a nd pH and electrical conductivity
decreased with the increasing soil depth.
 
Date 2016-10-24T14:36:09Z
2016-10-24T14:36:09Z
2016
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81541
 
Language en
 
Format application/pdf
 
Publisher CCSHAU