Balanced nutrient management is a major concern in the present-day scenario, especially in soils of arid regions, which are low in soil fertility; hence, supplementation of sulphur (S) helps in plant growth and maintenance of soil health. The use of amino acids as biostimulants has gained widespread importance in recent times. L-aspartic acid (ASP) is one of the amino acids, which plays a key role in plant growth and stress management. No studies have reported the use of ASP in mung bean; therefore, the present study investigates the effect of graded levels of S application in soil and foliar application of ASP on growth and yield of mung bean. The field experiment was conducted during kharif 2024 and 2025 at Central Arid Zone Research Institute, Jodhpur in a split plot design containing four main plots (0, 20, 40 and 60 kg sulphur ha⁻¹) and four subplots (0, 40, 80 and 120 mg L⁻¹ aspartic acid) with 3 replications. Our research findings revealed that both S and ASP positively improved the growth parameters and yield of mung beans. Relative to the control, the improvement in plant height, leaf area index (LAI), dry matter production, specific leaf weight (SLW), crop growth rate (CGR), net assimilation rate (NAR) and grain yield was 18.3, 15.8, 47.2, 17.1, 52.8, 30.0 and 72.6 %, respectively, by S60 (pooled). Similarly, A120 produced 15.7, 15.1, 34.8, 8.6, 38.2, 19.2 and 25.3 % higher values for the above parameters compared to the control (pooled). The correlation analysis indicated a significantly positive correlation of grain yield with NAR at 25–45 days after sowing (DAS) (0.961 **) and at 45–65 DAS (0.937 **).
