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Subject: Soil Sciences × Author: Ankit × End date: 2023 × Start date: 2022 ×
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    ThesisItemOpen Access
    Effect of different cropping systems on organic carbon fractions in soils of district Hisar, Haryana
    (CCS HAU, Hisar, 2022-08) Ankit; Dhram Prakash
    A study on effect of different cropping systems on organic carbon fractions in soils of district Hisar, Haryana was conducted. From different cropping systems viz., rice-wheat, cotton-wheat, pearl millet-wheat and pearl millet-mustard, total 80 surface soil samples (20 from each cropping system) were collected from farmer’s fields after the harvest of rabi crops during the month of April, 2022 and were analyzed for soil pH, EC, soil organic carbon fractions, available macro and micro nutrients, microbial biomass and soil enzyme activities. The lowest soil pH (7.8) and EC (0.55 dS m-1) were found under rice-wheat cropping system. The soil organic carbon, total organic carbon and dissolved organic carbon were found higher (0.56%, 0.68% and 33.17 mg kg-1) under rice-wheat cropping system, however, these were lower (0.39%, 0.49% and 24.11 mg kg-1) under pearl millet-mustard cropping system. The very labile and labile carbon content were observed higher under cotton-wheat (0.23%) and pearl millet-wheat (0.14%) cropping system, respectively. Less labile (0.31%) and recalcitrant carbon (0.13%) were found higher in soils under rice-wheat cropping system. Relatively less labile carbon was significantly higher (44.70% of TOC) in soils under rice-wheat cropping system than other three cropping systems. The available nitrogen (155.9 kg ha-1), phosphorus (54.3 kg ha-1), potassium (354.0 kg ha-1) and sulphur (59.3 kg ha-1) were observed higher in cotton-wheat, rice-wheat, pearl millet-wheat and cotton-wheat, respectively. Zinc (Zn), iron (Fe), manganese (Mn) and copper (Cu) micronutrient content were found higher under rice-wheat cropping system. The highest microbial biomass carbon (MBC) and nitrogen (MBN) were also observed under rice-wheat cropping system. The MBC and MBN content of rice-wheat cropping system were higher by 19.59% and 17.93%; 18.99% and 32.19% higher over pearl millet-wheat and cotton-wheat cropping system, respectively. The dehydrogenase, alkaline phosphatase and urease activity were also found highest under rice-wheat cropping system. Soil organic carbon content showed a positive and significant impact on nutrient availability (N, P, S, Fe, Mn and Zn content) and microbiological properties (MBC, MBN, dehydrogenase, urease, alkaline phosphatase activity) in soils under different cropping systems.