Physical and chemical properties of red and black soils of selected benchmark Spots for carbon sequestration studies in Semi-Arid Tropics of India [electronic resource]. by T. Bhattacharyya [et al..]
Material type:
Mixed materialsSeries: Global theme on agroecosystems Report No.35Publisher: Andhra Pradesh International Crops Research Institute for the Semi-Arid Tropics 2007Description: iii, 232 p. ill, graphs, charts 27 cmSubject(s): RED SOILS | BLACK SOILS | SEMI-ARID TROPICS | INDIADDC classification: 631.4106 Online resources: Item Resolution URL View online | Click here to access online Summary: Physical (nine characteristics) and chemical (14) properties of red and black soils are described: sand, silt, clay, fine clay, BD, COLE, HC (hydraulic conductivity) and WDC; pH (H2O and KCl), EC, OC, CaCO3, clay CO3, extractable Ca, Mg, Na, K, CEC, clay CEC, BS and ESP are described in three ecosystems, namely sub-humid (moist and dry) [SH (m) and SH (d)], semi-arid (moist and dry) [SA (m) and SA (d)] and arid in SAT, India. Clay contents vary between 30% in arid system to 82% in sub-humid (dry) system and 79% in semi-arid (dry) system. The red soils contain 8–%x;-55% clay. Fine clay (<0.2 (So(Bm) content ranges between 9–%x;54% in red soils; for black soils nearly50% of total clay (<2 (So(Bm) remains in finer (<0.2 (So(Bm) fractions. The overall relation between SOC and BD is negative; however, the correlation between SIC and BD within a depth of 0–%x;30 cm soil depth is positive. Increase in relative proportion of coarse fragments increases the pore space, effecting decrease in BD values. The inherent relation between total clay and COLE in different bioclimatic systems indicates a positive correlation with a relatively high value (r = 0.83) in arid bioclimatic system. Except sub-humid (moist) and arid bioclimates, a positive correlation between COLE and slickensides is observed in most of the Vertisols in SAT India. A general decreasing trend of SOC with increase in HCis observed. Conversely, an increasing trend of HC has been found with decrease in SIC. In all the bioclimates, there is an increasing trend of SOC with decrease in ESP and an increasing trend of SIC with increase in ESP. This is due to preferential release of Ca2+ ions and their precipitation as CaCO3 in soil, thereby increasing the relative concentration of Na+ ions in the exchange complex effecting high value of ESP. In general, a positive correlation between amount of fine clay and SOC in surface soils has been found.The SOC values in the surface (0–%x;30 cm) follow the trend of forest system > permanent fallow (grass
| Item type | Current location | Call number | Status | Date due | Barcode |
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Report
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GKVK Library | 631.4106 ICRISAT (Browse shelf) | Available | R-17605 |
Physical (nine characteristics) and chemical (14) properties of red and black soils are described: sand, silt, clay, fine clay, BD, COLE, HC (hydraulic conductivity) and WDC; pH (H2O and KCl), EC, OC, CaCO3, clay CO3, extractable Ca, Mg, Na, K, CEC, clay CEC, BS and ESP are described in three ecosystems, namely sub-humid (moist and dry) [SH (m) and SH (d)], semi-arid (moist and dry) [SA (m) and SA (d)] and arid in SAT, India. Clay contents vary between 30% in arid system to 82% in sub-humid (dry) system and 79% in semi-arid (dry) system. The red soils contain 8–%x;-55% clay. Fine clay (<0.2 (So(Bm) content ranges between 9–%x;54% in red soils; for black soils nearly50% of total clay (<2 (So(Bm) remains in finer (<0.2 (So(Bm) fractions. The overall relation between SOC and BD is negative; however, the correlation between SIC and BD within a depth of 0–%x;30 cm soil depth is positive. Increase in relative proportion of coarse fragments increases the pore space, effecting decrease in BD values. The inherent relation between total clay and COLE in different bioclimatic systems indicates a positive correlation with a relatively high value (r = 0.83) in arid bioclimatic system. Except sub-humid (moist) and arid bioclimates, a positive correlation between COLE and slickensides is observed in most of the Vertisols in SAT India. A general decreasing trend of SOC with increase in HCis observed. Conversely, an increasing trend of HC has been found with decrease in SIC. In all the bioclimates, there is an increasing trend of SOC with decrease in ESP and an increasing trend of SIC with increase in ESP. This is due to preferential release of Ca2+ ions and their precipitation as CaCO3 in soil, thereby increasing the relative concentration of Na+ ions in the exchange complex effecting high value of ESP. In general, a positive correlation between amount of fine clay and SOC in surface soils has been found.The SOC values in the surface (0–%x;30 cm) follow the trend of forest system > permanent fallow (grass
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