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- Title
PHYSIOLOGICAL RESPONSE OF TOMATO PLANTS UNDER DIFFERENT IRRIGATION LEVELS AND NUTRIENT CONCENTRATIONS IN GREENHOUSE.
- Authors
Ullah, Ikram; Mao Hanping; Shabbir, Abdul; Ullah, Muhammad Saif; Jabran, Khawar; Javed, Qaiser; Buttar, Noman Ali; Azeem, Ahmad
- Abstract
This study assessed the response of various water levels and concentration of nutrients on physiological characteristics of tomatoes under the greenhouse. The effects of various water levels as well as concentration of nutrients on the physiological characteristics of greenhouse tomatoes were discussed. Treatments consisted on five different levels of water based on crop evapotranspiration (ETC) as W50%, W75%, W100%, W125% and W150%, and also five different levels of nutrient concentrations based on strength of Hoagland solution (X) as N0.5X, N0.75X, N1.0X, N1.5X and N2.0X. The experiment was conducted during the Summer-Spring (SS) of 2015 and Fall-Winter (FW) of 2015-16. Deficit irrigation not only decreased photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) of tomato but also down regulated the light-saturated net photosynthetic rate (Pn,max) from 6.18% to 11.38% and e indicating light use efficiency by 5.08% to 6.0% during SS and FW respectively. Increase in nutrients, enhanced the daily mean Pn values up to 21.80 and 14.94 µmol (CO2) m² s-1 at N1.5X during SS and FW, respectively. Addition of nutrients more than 1.5X did not significantly improve the photosynthetic performance. No significant difference was observed in Pn on 42nd DAT for T6(W125%-N1.0X) and CR(W100%-N1.0X) but reduced significantly at subsequent measured days for CR. Considering only leaf gas exchange parameters, CR was found to be the optimal combination of water amount and nutrients concentration. Finally, interactive quadratic regression models were developed for Pn,max and e to measure the water and nutrients needs from instantaneous values of Pn,max and e. Our developed regression equations could be solved for momentarily estimation of water and nutrients.
- Subjects
GAS exchange in plants; WATER levels; IRRIGATION; TOMATOES; PHOTOSYNTHETIC rates; GREENHOUSES; TOMATO farming; DEFICIT irrigation
- Publication
Pakistan Journal of Agricultural Sciences, 2020, Vol 57, Issue 2, p599
- ISSN
0552-9034
- Publication type
Article
- DOI
10.21162/PAKJAS/19.844