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Plant Science Today (PST)

Research Articles

Vol. 13 No. sp5 (2026): Recent Advances in Agriculture

Effect of POLY4 (polyhalite) and different nutrient levels on growth and productivity of groundnut under irrigated conditions

DOI
https://doi.org/10.14719/pst.15532
Submitted
13 May 2026
Published
31-07-2026

Abstract

India is the world’s second largest groundnut producer, accounting for 30 % of global production with 119.42 lakh tonnes from 57.62 lakh hectares. Despite its economic significance, the national productivity (2073 kg ha-1) remains low due to sub-optimal nutrient management practices and soil compaction during the pegging stage. In this connection, this study evaluated the efficacy of POLY 4 (polyhalite), a multi-nutrient fertiliser (potassium (K), calcium (Ca), magnesium (Mg) and sulphur (S)), as both a soil amendment and a potential alternative to gypsum for groundnut cultivation. A field experiment was carried out at SRM College of Agricultural Sciences (SRMCAS), SRM Institute of Science and Technology (SRMIST), India during the rabi season of 2025–26 under irrigated conditions. The trial was laid out in a randomised block design (RBD) with 10 treatments and 3 replications on clay loam soil. The groundnut variety GG7 was sown with a spacing of 30 cm × 10 cm. The results revealed that the application of 100 % recommended dose of fertiliser (RDF-nitrogen and phosphorus (NP)- 25:50 kg ha-1) with POLY4 (applied in two splits: 50 % basal and 50 % at 45 days after sowing (DAS)) recorded the highest growth and physiological attributes viz., plant height (45.7 cm), dry matter production (6573 kg ha-1), number of branches plant-1 (13.2), leaf area index (4.20), total chlorophyll content (50.5 µmol m-2) and root nodule count plant-1 (273.2), alongside yield and yield attributes such as number of flowers plant-1 (36), number of pegs plant-1 (76), number of pods plant-1 (47), filling percentage (77), number of single seeded pods plant-1 (2.6), number of double seeded pods plant-1 (32.2), number of matured pods plant-1 (34.8), pod yield (2026 kg ha-1), haulm yield (5096 kg ha-1) and harvest index (0.30). Heatmap analysis further confirmed that treatment T5 (100 % RDF (N and P) + 100 % POLY4 (polyhalite) at 50 % basal and 50 % at 45 DAS) produced strong positive normalised values for growth, physiological and yield parameters, indicating enhanced vegetative growth and reproductive efficiency. The results suggest that polyhalite can improve the yield, leading to higher groundnut productivity under irrigated conditions.

References

  1. 1. Indiastat. Agricultural data, land use domain.
  2. 2. Konappan S, Ramanujam K, Saitheja V, Subramanian S, Govindan SK, Ettiyagounder P, et al. Polyhalite as a next generation chloride free multi-nutrient fertilizer for sustainable agriculture–review. J Plant Nutr. 2025;48(20):3784–814. https://doi.org/10.1080/01904167.2025.2523539
  3. 3. Jackson ML. Soil chemical analysis. 2nd ed. New Delhi: Prentice Hall of India Pvt. Ltd. 1973. p. 151–54.
  4. 4. Walkley A, Black IA. An examination of the Degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Sci. 1934;37(1):29–38. https://doi.org/10.1097/00010694-193401000-00003
  5. 5. Subbiah BV, Asija GL. A rapid procedure for estimation of available nitrogen in soil. Curr Sci. 1956;25:256–60.
  6. 6. Stanford S, English L. Use of the flame photometer in rapid soil tests for potassium and calcium. Agron J. 1949;41(9):446–47. https://doi.org/10.2134/agronj1949.00021962004100090012x
  7. 7. Gomez KA, Gomez AA. Statistical procedures for agricultural research. New York: John Wiley and Sons; 1984.
  8. 8. Zhao S, Guo Y, Sheng Q, Shyr Y. Heatmap3: An improved heatmap package with more powerful and convenient features. BMC Bioinformatics. 2014;15(Suppl 10):P16. https://doi.org/10.1186/1471-2105-15-S10-P16
  9. 9. Karthikeyan PK, Ranjani R, Bhuvaneswari R, Rameshkumar S, Gokul D, Swetha Reddy K, et al. Polyhalite as a source of potassium on dry matter production and nutrient uptake of black gram cv. ADT 5. Res J Agric Sci. 2023;14(1):122–26.
  10. 10. Yadav R, Jat LK, Yadav SV, Singh RP, Yadav PK. Effect of gypsum on growth and yield of groundnut (Arachis hypogaea L.). Environ Ecol. 2015;33:676–79.
  11. 11. Hoang Minh Tam, Duong Minh Manh, Truong Thi Thuan, Ho Huy Cuong, Pham Vu Bao. Agronomic efficiency of polyhalite application on peanut yield and quality in Vietnam. Electron Int Fertilizer Correspondent (e-IFC). 2016;47:3–12.
  12. 12. Sunitha B, Gopinath KA, Kumari VV, Ramanjaneyulu AV, Suvana S, Yakadri M. Effect of POLY4 application on the growth and yield of groundnut (Arachis hypogaea L.). Int J Environ Clim Change. 2023;13:2571–77. https://doi.org/10.9734/ijecc/2023/v13i92490
  13. 13. Maity B, Sairam M, Ray S, Maitra S, Dash B, Guchhait D. Evaluation of polyhalite as a potassium and sulphur source for improving the growth and productivity of summer groundnut (Arachis hypogaea L.). Crop Res. 2025;60:357–62. https://doi.org/10.31830/2454-1761.2025.CR-1069
  14. 14. Gopinath KA, Rajanna GA, Visha Kumari V, Singh VK, Ajay BC, Awasthi NK, et al. Exploring the use of POLY4 for the improvement of productivity, peanut quality and soil properties in Southern India. Front Plant Sci. 2024;15:1448909. https://doi.org/10.3389/fpls.2024.1448909
  15. 15. Li X, Jiao N, Li G. Effects of combined application of NPK compound fertilizer with polyhalite fertilizers on peanut yield, nutrient content and partitioning in Henan Province, China. Electron Int Fertilizer Correspondent (e-IFC). 2021;64:11–20.
  16. 16. Tan H, Cui Y, Liu C, Zeng F, Han C, Zhang H, et al. Toward the replacement of conventional fertilizer with polyhalite in eastern China to improve peanut growth and soil quality. Chem Biol Technol Agric. 2022;9:94. https://doi.org/10.1186/s40538-022-00363-7
  17. 17. Zhou Z, Chen K, Yu H, Chen Q, Wu F, Zeng X, et al. Changes in tea performance and soil properties after three years of polyhalite application. Agron J. 2019;111(4):1967–76. https://doi.org/10.2134/agronj2018.06.0393

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