Organic carbon pools and available nutrient status in rice growing soils of Haryana
KrishiKosh
View Archive InfoField | Value | |
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
|
|