The experiment on Kinnow mandarin was laid out in split-plot design with four replications. The treatments comprised of four frequencies of irrigation based on net CPE (CPE-RF) i.e. at l₁ = 80 mm, I₂ = 120 mm, I₃ = 160 mm and I₄ = 240 mm in the main plots and two types of organic mulches viz. M₁ = Sal (Shorea robusta) and M₂ =Lantana (Lantana camara) leaves in addition to control (without mulch) in the sub-plots. The tree volume, biomass production, carbon sequestration, fruit yield and physico-chemical properties of Kinnow mandarin were improved significantly with irrigation treatments in order of I₁ > I₂ > I₃ > I₄ and mulch did not influenced significantly. The tree volume of Kinnow was recorded maximum (78.94 m³) with I₁ treatment as 67.5, 26.71 and 12.56 per cent more over I₄ , I₃ and I₂ treatments of irrigation, respectively, which was positively correlated with carbon storage, carbon sequestration and fruit yield in the tree. The highest carbon stock of Kinnow (30.0 Mg/ha) followed by 28.7, 27.4 and 25.2 Mg/ha under different irrigation frequencies, respectively. Maximum fruit yield was recorded (83.30 kg/tree) with I₁ treatment was 76.56, 27.62 and 11.95 per cent more over I₄, I₃ and I₂ treatments, respectively. Kinnow fruit plants raised with M1 treatment produced 4.94 and 16.02 per cent more fruits than M₂ and M₃ treatment, respectively besides improving the microclimate. The study indicates that irrigation and mulching have positive response on Kinnow mandarin in Doon Valley. Therefore, 75 m³ water per plant with mulch is optimum is recommended for carbon dioxide mitigation and fruit production in Kinnow mandarin in sandy loam soils.