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<p>Seaweed extract-based products (SWEPs) offer potential as nutrient sources in regenerative agriculture, in addition to their biostimulant properties. However, limited data exist on granular seaweed formulations, particularly regarding nutrient release kinetics and agronomic performance in acidic soils.&#xa0;This study evaluated a granular SWEP (<i>Sagarika Z + +</i> ™) in a highly acidic soil (pH 3.87). Two experiments were conducted: (i) an incubation study assessing nitrogen (N), phosphorus (P), and potassium (K) release from SWEP-amended soil (0.1% − 4% w/w), and (ii) a greenhouse pot experiment evaluating SWEP (5, 10, and 20&#xa0;mg kg<sup>− 1</sup> soil) with 100% recommended NPK on post-harvest soil properties and wheat yield.&#xa0;The granular product exhibited alkaline pH, considerable amounts of N (0.49%), P (0.03%) and K (0.54%), and high amounts of calcium and micronutrients. After the application, the nutrient was released quickly up to 96&#xa0;h, registered maximum release at ~ 192&#xa0;h, followed by attainment of a plateau, or a decline in the case of P. The simplified Elovich model best described N and K release, while P-release followed the power function model. In the pot study, SWEP significantly improved soil pH, organic carbon, and available N, P, and K. Wheat grain yield increased notably, with the highest yield (6.93&#xa0;g pot<sup>− 1</sup>) at 10&#xa0;mg kg<sup>− 1</sup> SWEP, surpassing the 100% NPK treatment.&#xa0;The SWEP should be applied roughly two weeks before the crop’s peak nutrient demand. These granules need to be included in a package of practices in regenerative agriculture as an amendment and nutrient source in acidic soils.</p> Graphical Abstract <p></p>

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Release Kinetics of Major Plant Nutrients from a Seaweed Extract-Based Product and Its Effect on Soil Fertility and Wheat Productivity in an Acid Soil of North-Eastern Hill Region of India

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Bijan Kumar Mondal,
  • Abir Dey,
  • MC Meena,
  • Debarup Das,
  • Archana Singh,
  • Shivani Nagar,
  • Prasenjit Ray,
  • PK Upadhyay,
  • Deepak Bamel,
  • Amit Kumar Dash,
  • Krishna Kumar Mourya,
  • Narender Yadava,
  • Tarunendu Singh

摘要

Seaweed extract-based products (SWEPs) offer potential as nutrient sources in regenerative agriculture, in addition to their biostimulant properties. However, limited data exist on granular seaweed formulations, particularly regarding nutrient release kinetics and agronomic performance in acidic soils. This study evaluated a granular SWEP (Sagarika Z + + ™) in a highly acidic soil (pH 3.87). Two experiments were conducted: (i) an incubation study assessing nitrogen (N), phosphorus (P), and potassium (K) release from SWEP-amended soil (0.1% − 4% w/w), and (ii) a greenhouse pot experiment evaluating SWEP (5, 10, and 20 mg kg− 1 soil) with 100% recommended NPK on post-harvest soil properties and wheat yield. The granular product exhibited alkaline pH, considerable amounts of N (0.49%), P (0.03%) and K (0.54%), and high amounts of calcium and micronutrients. After the application, the nutrient was released quickly up to 96 h, registered maximum release at ~ 192 h, followed by attainment of a plateau, or a decline in the case of P. The simplified Elovich model best described N and K release, while P-release followed the power function model. In the pot study, SWEP significantly improved soil pH, organic carbon, and available N, P, and K. Wheat grain yield increased notably, with the highest yield (6.93 g pot− 1) at 10 mg kg− 1 SWEP, surpassing the 100% NPK treatment. The SWEP should be applied roughly two weeks before the crop’s peak nutrient demand. These granules need to be included in a package of practices in regenerative agriculture as an amendment and nutrient source in acidic soils.

Graphical Abstract