Long-term impact of pulses and organic amendments inclusion in cropping system on soil physical and chemical properties

Mono-cropping of maize–wheat, mechanical disintegration of soils, and continuous chemical fertilization have deteriorated soil health in the Indo-Gangetic Plains. We studied the long-term impact of pulse-based cropping systems with integrated nutrient management on soil physical and chemical properties and yield sustainability. We evaluated four different cropping systems: (1) maize–wheat (M–W), (2) maize–wheat–mungbean (M–W–Mb), (3) maize–wheat–maize–chickpea (M–W–M–C), (4) pigeonpea–wheat (P–W) each with three degrees of soil fertilization techniques: (1) unfertilized control (CT), (2) inorganic fertilization (RDF), and (3) integrated nutrient management (INM). The field experiment was undertaken in a split-plot design with three replications each year with a fixed layout. P–W and M–W–Mb systems enhanced soil properties such as volume expansion by 9–25% and porosity by 7–9% (p < 0.05) more than M–W, respectively. P–W and M–W–Mb increased soil organic carbon by 25–42% and 12–50% over M–W (RDF). P–W system enhanced water holding capacity and gravimetric moisture content by 10 and 11% (p < 0.05) than M–W. Pulse-based systems (P–W and M–W–Mb) had higher available nitrogen (8–11%), phosphorus (42–73%), and potassium (8–12%) over M–W (p < 0.05). M–W–Mb increased 26% maize yield and 21% wheat yield over M–W (p < 0.05) at the thirteenth crop cycle. P–W system had a higher sustainable yield index (p < 0.05) of wheat over the M–W. Thus, pulse inclusion in the cropping system in combination with INM can enhance physical and chemical properties vis-à-vis sustainable yield index over the cereal-cereal system.