Depth-wise Distribution of Potassium Fractions and Micronutrients and their Relationship in Coastal Saline Soils of Raigad, Maharashtra

SAURABH Y.  RAKHONDE; DEVDATTA G. JONDHALE; MANOJ R. WAHANE; DEEPAK K. BORSE; SURESH B. DODAKE; JAGDISH PRASAD

doi:10.54894/JISCAR.43.2.2025.168907

Authors

SAURABH Y. RAKHONDE Department of Soil Science and Agricultural Chemistry, College of Agriculture, Dr. B.S. Konkan Krishi Vidyapeeth, Dapoli - 415 712, Ratnagiri, Maharashtra, India
DEVDATTA G. JONDHALE Regional Agricultural Research Station, Karjat - 410 201, Raigad, Maharashtra, India
MANOJ R. WAHANE Khar Land Research Sation, Panvel - 410 206, Raigad, Maharashtra, India
DEEPAK K. BORSE Department of Agronomy, College of Agriculture, Dapoli - 415 712, Ratnagiri, Maharashtra, India
SURESH B. DODAKE Department of Soil Science and Agricultural Chemistry, College of Agriculture, Dr. B.S. Konkan Krishi Vidyapeeth, Dapoli - 415 712, Ratnagiri, Maharashtra, India
JAGDISH PRASAD ICAR-National Bureau of Soil Survey and Land Use Planning, Nagpur - 440 033, Maharashtra, India

https://doi.org/10.54894/JISCAR.43.2.2025.168907

Keywords:

Coastal soils, Correlation, Micronutrients, Potassium fractions, Quasi-equilibrium

Abstract

Seven representative pedons from the coastal region of Raigad district, Maharashtra, were analysed to study the relationship between potassium fractions and DTPA-extractable micronutrients. The soils were slightly to moderately acidic (pH 5.05-6.60) with EC (0.15-20.10 dS m^-1), high organic carbon (23.10 g kg^-1), and high available K (3091.47 mg kg^-1). Pedon 1 and Pedon 4 had highest exchangeable K (231.70 mg kg^-1) and total K (8215.80 mg kg^-1), respectively while highest non-exchangeable K (2442.25 mg kg^-1) and lattice K occurred in the sub-surface horizons of Pedon 2. The sequence of potassium fractions was: total K > lattice K > non-exchangeable K > available K > exchangeable K > water-soluble K. Soil pH showed an inverse relationship with organic carbon, while available K was positively correlated with most K forms except lattice K. Water-soluble K was strongly correlated with available K (r = 0.968***), non-exchangeable K (r = 0.791***), and total K (r = 0.395*). DTPA-Fe and Mn showed significant negative correlations with available and water-soluble K, while exchangeable and non-exchangeable K were negatively related to Fe, Mn, and Cu. Among micronutrients, Fe correlated positively with Mn (r = 0.434*), Cu (r = 0.469*), and Cu with Zn (r = 0.51**). PCA revealed four components (eigenvalues >1) explaining 85.87% of total variance. Overall, all K forms except lattice K were significantly associated with DTPA-extractable Fe and Mn, indicating dynamic interactions among K fractions and micronutrients.

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Author Biography

JAGDISH PRASAD, ICAR-National Bureau of Soil Survey and Land Use Planning, Nagpur - 440 033, Maharashtra, India

Former Principal Scientist, Division of Soil Resource Studies,

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