Effect of potash, iron and zinc on soil fertility status after harvest of groundnut

Abstract

A field experiment was conducted during the kharif seasons of 2022 and 2023 at the Agronomy Instructional Farm, Department of Agronomy, Chimanbhai Patel College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, to evaluate the effect of potassium, iron, and zinc on the growth, yield, and quality of groundnut. The study comprised 27 treatment combinations involving three levels each of potassium (K₀: 0, K₁: 25, K₂: 50 kg K₂O ha⁻¹), iron (Fe₀: 0, Fe₁: 15, Fe₂: 30 kg Fe ha⁻¹), and zinc (Zn₀: 0, Zn₁: 8, Zn₂: 16 kg Zn ha⁻¹), laid out in a factorial randomized block design with three replications. The pooled results revealed that application of 50 kg K₂O ha-1 (K2), 30 kg FeSO4.7H2O ha⁻¹ (Fe2), and 16 kg ZnSO4.7H2O (Zn2) ha⁻¹ significantly improved in available K₂O, DTPA extractable Fe and zinc in soil.