Point of Zero Charge of Soils - It’s Dynamics under Fertilizer Management Practices and Nutrient Availability

Aims: To study the dynamics of point zero charge different soil types and determine availability nutrients under influence specific fertilizer management practices.
 Study Design: Completely Randomized Design.
 Place Duration Study: Department Soil Science, Assam Agricultural University, Jorhat, Assam; between March 2020 December 2021.
 Methodology: We estimated (PZC) components, i.e., salt effect (PZSE) net (PZNC) in six surface samples [black (Vertisol), laterite (Alfisol), red (Alfisol) Odisha, alluvial soils belonging to Entisol, Inceptisol, Alfisol Assam, India] through potentiometric titration ion retention methods respectively. The were subjected four practices laboratory incubation, viz., FYM @ 5 t ha-1 (T1), NPK 80:40:40 for Odisha 60:20:40 (T2), T1 + T2 (T3) T3 Lime requirement/ Gypsum requirement (T4). PZC components determined at 15 30 days after incubation.
 Results: PZSE values ranged from 2.18 4.70, while PZNC achieved relatively lower pH ranging 2.03 4.10. Highest recorded treatment followed by T3, T4 all incubated samples, however there was a decrease with increase incubation. Comparatively, resulted as most ideal practice. Besides providing optimum amount primary maximum secondary nutrients, regulated favouring minimal loss enhanced nutrient use efficiency. ions is influenced difference solution soil, which be highest Vertisol (OS1), Entisol (AS1), Inceptisol (AS2), (AS3, OS2, OS3) orders.
 Conclusion: exchange cationic get due higher CEC high clay organic matter percentage. these must therefore better anionic nutrients. Highly weathered order exhibit optimal over narrow range, hence simultaneously require frequent application along manures retention, mobility soil.