Scholarlink

<p>Rice (<i>Oryza sativa</i> L.) is a staple crop contributing about 21% of global energy and 15% of protein needs. Despite this, rice productivity is often limited by abiotic stresses such as zinc deficiency. Because rice has a narrow range between zinc deficiency and toxicity, precise measurement of zinc in the soil–plant system using specific extractants is essential. This study evaluated the effectiveness of various extractants to determine critical levels of plant-available Zn in selected soil series of the New Alluvial Zone (NAZ) of West Bengal. Soil samples were collected from fifteen NBSS &amp; LUP-recognized soil series. The extractants tested included MgCl<sub>2</sub>, HCl, EDTA–Ammonium carbonate, DTPA, Mehlich 3, ABDTPA, CDTA, and Modified Morgan. Their suitability was assessed through correlation analyses between extractants, soil physicochemical properties, and zinc fractions. Pot experiments using <i>boro</i> rice (variety IET 4786) with five zinc doses (0.00, 0.96, 2.40, 3.84, and 4.80&#xa0;mg Zn kg<sup>−1</sup> soil) were conducted to validate results, measuring plant growth parameters at 85 DAS and at harvest. Among the extractants, ABDTPA was identified as the most effective for estimating plant-available zinc. Critical zinc thresholds were statistically determined: 0.98&#xa0;mg&#xa0;kg<sup>−1</sup> for ABDTPA-extractable Zn in soil, 27.90&#xa0;mg&#xa0;kg<sup>−1</sup> Zn in rice dry matter at 85 DAS, and 17.00&#xa0;mg&#xa0;kg<sup>−1</sup> Zn in rice grain at harvest. The study concludes that ABDTPA is a reliable extractant for Zn availability in NAZ soils, and the thresholds provide useful guidelines for zinc nutrition management in <i>boro</i> rice cultivation to improve productivity and nutrient management in the region.</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

Evaluation of zinc extractants and critical zinc thresholds in new alluvial soils (inceptisol) under boro rice

  • 期刊论文

  • 发表日期：

    2026年4月5日

查看全文
  • Parijat Bhattacharya,
  • Sudip Sengupta,
  • Purabi Banerjee,
  • Amit Phonglosa,
  • Kallol Bhattacharyya

摘要

Rice (Oryza sativa L.) is a staple crop contributing about 21% of global energy and 15% of protein needs. Despite this, rice productivity is often limited by abiotic stresses such as zinc deficiency. Because rice has a narrow range between zinc deficiency and toxicity, precise measurement of zinc in the soil–plant system using specific extractants is essential. This study evaluated the effectiveness of various extractants to determine critical levels of plant-available Zn in selected soil series of the New Alluvial Zone (NAZ) of West Bengal. Soil samples were collected from fifteen NBSS & LUP-recognized soil series. The extractants tested included MgCl2, HCl, EDTA–Ammonium carbonate, DTPA, Mehlich 3, ABDTPA, CDTA, and Modified Morgan. Their suitability was assessed through correlation analyses between extractants, soil physicochemical properties, and zinc fractions. Pot experiments using boro rice (variety IET 4786) with five zinc doses (0.00, 0.96, 2.40, 3.84, and 4.80 mg Zn kg−1 soil) were conducted to validate results, measuring plant growth parameters at 85 DAS and at harvest. Among the extractants, ABDTPA was identified as the most effective for estimating plant-available zinc. Critical zinc thresholds were statistically determined: 0.98 mg kg−1 for ABDTPA-extractable Zn in soil, 27.90 mg kg−1 Zn in rice dry matter at 85 DAS, and 17.00 mg kg−1 Zn in rice grain at harvest. The study concludes that ABDTPA is a reliable extractant for Zn availability in NAZ soils, and the thresholds provide useful guidelines for zinc nutrition management in boro rice cultivation to improve productivity and nutrient management in the region.