Zinc Availability in Reclaimed Sodic Soil under Rice-Wheat Cultivation Following Conservation Agriculture-Based Nutrient Management Practices
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Authors
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Diksha Saroha
ICAR-Central Soil Salinity Research Institute, Karnal-132001, Haryana, India
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Hanuman Sahay Jat
ICAR-Central Arid Zone Research Institute, Jodhpur-342003, Rajasthan, India
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Ram Kishor Fagodiya
ICAR-Central Soil Salinity Research Institute, Karnal-132001, Haryana, India
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Kiran Khokhar
CCS Haryana Agricultural University, Hisar-125004, Haryana, India
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Raj Mukhopadhyay
ICAR-Central Soil Salinity Research Institute, Karnal-132001, Haryana, India
Keywords:
Available soil Zn, Buffering capacity, Partial conservation agriculture, Per cent saturation, Supply parameterAbstract
The deficiency of available Zn in soil is a major constraint to crop productivity and quality, and has contributed to widespread human malnutrition. To address this issue, the present study examined Zn adsorption and availability in soil under a rice-wheat cropping system following conservation agriculture (CA)-based nutrient management practices. The initial Zn concentration was directly proportional to per cent saturation and the supply parameter, but inversely related to the differential buffering capacity (DBC) of the soil. This relationship indicated greater Zn adsorption with a decreasing rate at higher initial Zn concentrations, along with an increase in the quantity factor (solid phase). Approximately 100% Zn saturation was achieved at an initial Zn concentration of ~150 mg L-1, while the DBC was maximum (646 and 1441 L kg-1 at 25℃ and 40℃, respectively) under full conservation agriculture with inorganic nutrient management. Among the management practices, full conservation agriculture and higher temperature conditions promoted stronger Zn adsorption, thereby restricting its availability in soil. Although the effect of organic manure application on Zn availability was not clearly evident in the present study, the supply parameter was higher under organic manuring than under conventional and full conservation agriculture practices. Overall, partial conservation agriculture practices resulted in greater available Zn concentrations, whereas soils under full conservation agriculture require higher Zn fertilization due to their elevated differential buffering capacity.
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References
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