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ThesisItem Open Access Long-term effect of continuous cropping on different forms of nutrients in some benchmark soils of Haryana(CCSHAU, 2017) DHEERAJ; DEV RAJA study was carried out on different benchmark soil profiles of Haryana to access the nutrient status and their fractions at the Department of Soil Science, CCS Haryana Agricultural University, Hisar. A total of eight different soil profiles were selected having respective cropping systems and physical and chemical properties. Soil samples were collected from depths 0-15, 15-30, 30-45, 45-60 and 60-90 cm depths in triplicate from each of the soil profiles. The soil samples were analyzed for the determination of various nutrient fractions viz. pH, EC, TOC, carbon fractions, nitrogen fractions, phosphorus fractions, potassium fractions and sulphur fractions. A perusal of the results obtained revealed that among all of the nutrient fractions, soil pH, EC, fractions of potassium and fractions of sulphur were decreased from their initial status in all of the benchmark soil profiles, however soil organic carbon and its fractions, nitrogen fractions and phosphorus fractions were found to be increased from their initial values in all the profiles. Soil pH and EC varied from 7.4 to 8.6 and 0.14 to 0.60 dS/m respectively for the soil profiles. The organic carbon in all of the soil profiles was found to be increased, highest increase being in HAU farm soil under fallow-wheat cropping system. All of the carbon fractions exhibited a net increase in all of the soil profiles just like organic carbon, but with increasing soil depth their respective content was found decreased. A significant positive correlation was observed among OC and its fractions. The nitrogen fractions were found to be increased over the initial status in all benchmark soil profiles. Highest organic, ammonium and nitrate N content was found in Kaul soils alone having a rice-wheat cropping system. The nitrate nitrogen content was found increased in lower depths of soil profiles, contrary to the other two nitrogen fractions which exhibited a decrease as we moved down in soil profile. Phosphorus fractions were also found to be increased from their initial status, where org-P and Ca-P were found highest in RDS farm under fallow-wheat cropping sequence while Al-P and Fe-P were observed to be highest in Kaul soil profile with ricewheat cropping system. All of the phosphorus fractions were following a decreasing trend with increasing soil depth in each soil profile. The various potassium fractions were observed to be decreased in upper soil layers, while in lower depths a net increase in all the K fractions was noted in each of the benchmark soil profiles. Kaul soil profile having rice –wheat cropping system exhibited maximum content of exchangeable and non-exchangeable potassium, while Kaithal soils with ricewheat cropping system had highest water soluble potassium content. The contents of organic, inorganic and non-sulphate sulphur were also found decreased from their initial status in all of the benchmark soil profiles. However a decreasing trend was followed by K fractions with increasing soil depth in all soil profiles. Uchani soils had highest organic sulphur content while highest inorganic and non-sulphate sulphur contents were observed in Panipat and Bawal soils under rice-wheat and pearlmillet-raya cropping systems respectively.