Comparative Analysis of Tillage Practices on Soil Characteristics in Vertisol for Groundnut-based Cropping System

Abstract

Tillage practices in groundnut-based Vertisol systems is essential for improving soil health and maximizing agricultural productivity. This study investigates the impact of tillage practices and cropping systems on soil physical and chemical properties in the Vertisol region of Karnataka during the 2022-23 Kharif and Rabi seasons. Conducted at the MARS, UAS, Dharwad, the experiment utilized a strip plot design, comparing minimum tillage with crop residue incorporation (M1) and conventional tillage without residue (M2) across four cropping systems. Findings revealed that minimum tillage significantly enhanced soil properties, demonstrating improved porosity (52.14%), maximum water holding capacity (55.97%) and soil aggregate stability (62.42%) while reducing bulk density (1.27 Mg m⁻³) at the surface layer. Among cropping systems, the groundnut + pigeon pea combination showed superior soil characteristics, with porosity at 50.88%, MWHC at 55.05%, and reduced bulk density of 1.31 Mg m⁻³ at 0-15 cm depth. Additionally, minimum tillage led to higher soil organic carbon (7.65 g kg⁻¹) and available NPK levels (315.8 kg ha⁻¹ N, 44.06 kg ha⁻¹ P, 324.53 kg ha⁻¹ K), particularly in the groundnut + pigeon pea system. These findings emphasize the efficacy of conservation agriculture techniques, reinforcing existing research that highlights how minimum tillage and leguminous cropping systems enhance soil health and foster sustainable farming practices. Such results are pivotal for promoting sustainable agricultural development, as they illustrate that implementing these practices can lead to significant improvements in soil vitality, crucial for boosting crop yields and ensuring ecological stability in Karnataka's Vertisol region.