Scholarlink

<p>Zinc (Zn) content in the soils of Western Indo-Gangetic Plain is deficient due to its low application rate and thereby its distribution into different fractions is not proportional. Zn behaves as cation and acts as micronutrient is the common part in all the fractions; thus, its availability merely depends upon the Soil Organic Carbon content (SOC). Thus, understanding of both SOC and Zn dynamics across the soils is crucial for enhancing nutrient availability and soil health with the objectives to evaluate the physio-chemical properties of soil, Zn fractions and its sorption–desorption behaviour, soil carbon pools and its related indices. Potato in this region is the major crop which cultivated either as main crop or secondary crop&#xa0;by most of the farmers. Soil samples were taken from three potato-based cropping systems (viz: sugarcane–ratoon–potato (SRP), paddy–potato (PP) and vegetable–vegetable (VV) along with fallow land considered as reference) at three depths (0–15, 15–30, 30–45&#xa0;cm) in the western Indo-Gangetic plains. In&#xa0;order to fulfil the objectives, the samples were analysed for physio-chemical properties, SOC pools, its indices, Zn fractions and its sorption–desorption behaviour. Results showed that clay content increased with depth and choked the pores so porosity decreased and chemical activity, electrical conductivity (EC), and pH increased, while SOC and nutrient levels fell significantly in sub-surface soils. At surface, non-labile (NL) and very labile (VL) fractions contributed to about 65% and microbial biomass carbon (MBC) contributed only 17% to total organic carbon (TOC). The PP system was more sensitive towards carbon, whereas SRP system resulted in highest carbon, its pools, and index. The Zn fractionation indicated that residual Zn was the main pool (&gt; 60%), while bioavailable Zn forms were under 5%. The SRP contributed highest&#xa0;to&#xa0;total, bio-available, and mobile Zn. The sorption patterns followed both Langmuir and Freundlich isotherms with higher sorption capacity in the SRP and increased Zn availability with depth, even as sorption parameters declined due to multilayered Zn. The findings therefore suggest SRP is optimal for Zn retention and carbon sequestration and PP best for SOC sensitivity. Thus, cropping system-specific strategies are essential for managing micronutrient dynamics and ensuring long-term soil sustainability.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of Soil Carbon Pools and Indices on Zinc Sorption Mechanisms and Distribution in Diverse Potato-based Cropping Systems of the Western Indo-Gangetic Plains

  • 期刊论文

  • 发表日期：

    2026年3月5日

查看全文
  • Shivam Singh,
  • Debashis Dutta,
  • Satendra Kumar,
  • Jagannath Pathak,
  • Uday Pratap Shahi,
  • B. P. Dhyani,
  • Ankit Tiwari,
  • Mahendra Pratap Singh,
  • R. B. Verma,
  • Richa Raghuvanshi

摘要

Zinc (Zn) content in the soils of Western Indo-Gangetic Plain is deficient due to its low application rate and thereby its distribution into different fractions is not proportional. Zn behaves as cation and acts as micronutrient is the common part in all the fractions; thus, its availability merely depends upon the Soil Organic Carbon content (SOC). Thus, understanding of both SOC and Zn dynamics across the soils is crucial for enhancing nutrient availability and soil health with the objectives to evaluate the physio-chemical properties of soil, Zn fractions and its sorption–desorption behaviour, soil carbon pools and its related indices. Potato in this region is the major crop which cultivated either as main crop or secondary crop by most of the farmers. Soil samples were taken from three potato-based cropping systems (viz: sugarcane–ratoon–potato (SRP), paddy–potato (PP) and vegetable–vegetable (VV) along with fallow land considered as reference) at three depths (0–15, 15–30, 30–45 cm) in the western Indo-Gangetic plains. In order to fulfil the objectives, the samples were analysed for physio-chemical properties, SOC pools, its indices, Zn fractions and its sorption–desorption behaviour. Results showed that clay content increased with depth and choked the pores so porosity decreased and chemical activity, electrical conductivity (EC), and pH increased, while SOC and nutrient levels fell significantly in sub-surface soils. At surface, non-labile (NL) and very labile (VL) fractions contributed to about 65% and microbial biomass carbon (MBC) contributed only 17% to total organic carbon (TOC). The PP system was more sensitive towards carbon, whereas SRP system resulted in highest carbon, its pools, and index. The Zn fractionation indicated that residual Zn was the main pool (> 60%), while bioavailable Zn forms were under 5%. The SRP contributed highest to total, bio-available, and mobile Zn. The sorption patterns followed both Langmuir and Freundlich isotherms with higher sorption capacity in the SRP and increased Zn availability with depth, even as sorption parameters declined due to multilayered Zn. The findings therefore suggest SRP is optimal for Zn retention and carbon sequestration and PP best for SOC sensitivity. Thus, cropping system-specific strategies are essential for managing micronutrient dynamics and ensuring long-term soil sustainability.