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<p>Organic carbon status of soils has been found central to the soil fertility, productivity, quality and health concepts. This gets further accentuated in production systems dominated by long-duration, nutrition-demanding crops like sugarcane in young un-weathered alluvium of Indo-Gangetic plains supporting intensive cropping systems. A field experiment to determine the critical level of initial soil organic carbon in sugarcane-growing Indo-Gangetic alluvial soils was carried out with twelve treatment combinations comprising four levels of initial SOC (0.45–0.55, 0.56–0.65, 0.66–0.75, &gt; 0.76%) and three nutrient management treatments (RDF-150, 60, 60 N, P, K; RDF + FYM 10 t/ha; and RDF + ZnSO<sub>4</sub> 25 + S 20&#xa0;kg/ha) evaluated in a randomised block design replicated thrice during 2016–2019. Results revealed that sugarcane plant and subsequent three ratoon crops in the system responded positively to higher initial SOC content for crop growth, yield attributes and yield parameters. A decline in growth and yield of subsequent ratoon crops was found; however, the extent of decline was lesser with increasing initial SOC. Monthly tiller population, LAI and dry matter partitioning to cane stalk for all the crops in the system significantly increased under initial SOC levels higher than 0.55–0.65%. Plant cane yield remained statistically similar at all the initial SOC levels when applied with RDF alone. There was, however, a significant increase in plant cane yield at 0.65% or higher initial SOC when RDF was supplemented either with FYM or zinc and sulphur. SOC level, 0.65–0.75% and higher combined with FYM or Zn and S brought about more than 18, 26, 20 and 53% enhancement in cane yield of plant and subsequent three ratoons, respectively, over that obtained with SOC level 0.45–0.55% with RDF. As far as SOC levels, there was a 5.14-to-10.68% increase in cane yield of plant and ratoon crops due to SOC levels higher than 0.55–0.65%. This reveals that in the sugarcane-growing soils of Indo-Gangetic plains, 0.65% initial SOC content is the critical level of SOC for reaping high cane yield in sugarcane plant–ratoon system.</p>

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Critical Level of Soil Organic Carbon for Sustainable Intensification of Sugarcane Plant–Ratoon System in Gangetic Plains of Indian Sub-Tropics

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Tapendra Kumar Srivastava,
  • Ram Ratan Verma,
  • S. R. Singh

摘要

Organic carbon status of soils has been found central to the soil fertility, productivity, quality and health concepts. This gets further accentuated in production systems dominated by long-duration, nutrition-demanding crops like sugarcane in young un-weathered alluvium of Indo-Gangetic plains supporting intensive cropping systems. A field experiment to determine the critical level of initial soil organic carbon in sugarcane-growing Indo-Gangetic alluvial soils was carried out with twelve treatment combinations comprising four levels of initial SOC (0.45–0.55, 0.56–0.65, 0.66–0.75, > 0.76%) and three nutrient management treatments (RDF-150, 60, 60 N, P, K; RDF + FYM 10 t/ha; and RDF + ZnSO4 25 + S 20 kg/ha) evaluated in a randomised block design replicated thrice during 2016–2019. Results revealed that sugarcane plant and subsequent three ratoon crops in the system responded positively to higher initial SOC content for crop growth, yield attributes and yield parameters. A decline in growth and yield of subsequent ratoon crops was found; however, the extent of decline was lesser with increasing initial SOC. Monthly tiller population, LAI and dry matter partitioning to cane stalk for all the crops in the system significantly increased under initial SOC levels higher than 0.55–0.65%. Plant cane yield remained statistically similar at all the initial SOC levels when applied with RDF alone. There was, however, a significant increase in plant cane yield at 0.65% or higher initial SOC when RDF was supplemented either with FYM or zinc and sulphur. SOC level, 0.65–0.75% and higher combined with FYM or Zn and S brought about more than 18, 26, 20 and 53% enhancement in cane yield of plant and subsequent three ratoons, respectively, over that obtained with SOC level 0.45–0.55% with RDF. As far as SOC levels, there was a 5.14-to-10.68% increase in cane yield of plant and ratoon crops due to SOC levels higher than 0.55–0.65%. This reveals that in the sugarcane-growing soils of Indo-Gangetic plains, 0.65% initial SOC content is the critical level of SOC for reaping high cane yield in sugarcane plant–ratoon system.