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The field experiment was conducted during 2013-14 to study the effects of fertigation on the phenology and physiological status of Citrus sinensis cv. Mosambi. The experiment was laid out in randomized block design with seven fertigation level, viz. T1- 120% of RDF; T2- 100% of RDF; T3- 80% of RDF; T4- 60% of RDF; T5- 40% of RDF; T6- Full dose in basal with drip irrigation and T7- Full dose in basal without drip irrigation and each treatment were replicated three times. Results obtained showed that increase in plant height (36.75 cm), trunk girth (4.67 cm), canopy volume (1.83 m3), leaf area index (5.51) and growth of current season shoot (9.42 cm2) of the plant were more responsive to higher dose of fertigation i.e. T1 followed by T2. The treatment effect was not marked on reproductive growth as expressed in terms of bud emergence, full bloom, fruit set and duration of bud emergence to maturity. The tree physiological parameters viz. total chlorophyll (2.65 mg/g), net photosynthesis rate (6.83 μmol CO2 /m2/sec), stomatal conductance (0.18 mol/m2/sec) and leaf area (31.9 cm2) were also higher under treatment receiving higher dose of fertigation i.e. T1. Therefore, on the basis of results obtained, treatment 120% RDF found superior in maintaining pheno-physiological status of mosambi plant under high density planting.

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The experiment was conducted during three consecutive year i e, 2013-14, 2014-15, 2015-16 to show the effect of fertigation on phenology and vegetative growth of the plants and nutrients uptake by the leaves. Result of three years pooled data showed that increase in plant height (35.81 cm), trunk girth (4.42 mm) canopy volume (1.94 m 3 ), growth of current season shoot (9.08 cm), leaf area (31.52 cm 2 ) and leaf area index (5.54) were responses more under higher doses of fertigation i e 120 % RDF followed by 100 % RDF. The phenological observations like bud emergence period, full bloom period, fruit set, date of maturity, etc. were also affected by the doses of fertilizers. On the basis of above findings it may be concluded that the different doses of fertilizers affect on vegetative growth as well as phenological parameters of the plant.