Gas exchange, chlorophyll fluorescence, biomass production, water use and yield response of tomato (Solanum lycopersicum) grown under deficit irrigation and varying nitrogen levels

ANANT BAHADUR; T D LAMA; S N S CHAURASIA

doi:10.56093/ijas.v85i2.46506

Authors

ANANT BAHADUR Senior Scientist, Indian Institute of Vegetable Research, Varanasi, Uttar Pradesh 221 305
T D LAMA Senior Scientist, Indian Institute of Vegetable Research, Varanasi, Uttar Pradesh 221 305
S N S CHAURASIA Principal Scientist and Head, Division of Vegetable Production, Indian Institute of Vegetable Research, Varanasi, Uttar Pradesh 221 305

https://doi.org/10.56093/ijas.v85i2.46506

Keywords:

Deficit irrigation, Gas exchange, N level, Tomato, Water use efficiency

Abstract

A field experiment on irrigation schedulings and nitrogen rates was conducted to study the physiological, growth and yield responses of tomato (Solanum lycopersicum L.) under deficit irrigation and various N levels. Results obtained indicated that irrigation at 10 or 20 days (I₁ and I₂) interval had significantly higher gas exchange (photosynthesis rate, stomatal conductance and transpiration rate), photochemical efficiency of PS II (Fv/ Fm), RWC, leaf area, chlorophyll content and fruit production over 30 days irrigation interval (I₃). Nitrogen application had also significant effects on most of the physiological, growth and yield traits at 45 and 75 DAT, however N at 120 kg/ha had noticed maximum gas exchange, Fv/Fm, leaf area, CCI and fruit production over other two N levels. Interaction of I x N had exhibited significant effect on few parameters such as; photosynthesis rate, stomatal conductance, leaf area and weed growth, particularly at 45 DAT. Biomass production and partitioning in various plant parts were varied significantly, and under moderate water deficit with higher N levels (I₂ N₁ and I₂ N₂), an optimum allocation of biomass (less in roots and stems and higher in fruits) was registered. The maximum WUE (14.19 q/ha/cm) was reported with irrigation scheduling at 20 days, besides 36% water savings over I₁. For realisation of higher WUE, tomato should be irrigated at 20 days intervals with N application at 120 kg/ha.

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