Open AccessModeling tomato evapotranspiration and yield responses to salinity using different macroscopic reduction functions
Author(s) -
Yang Hui,
Du Taisheng,
Mao Xiaomin,
Shukla Manoj K
Publication year - 2020
Publication title -
vadose zone journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.036
H-Index - 81
ISSN - 1539-1663
DOI - 10.1002/vzj2.20074
Subject(s) - brackish water , salinity , evapotranspiration , transpiration , irrigation , stomatal conductance , soil salinity , environmental science , deficit irrigation , irrigation scheduling , greenhouse , yield (engineering) , water use efficiency , agronomy , soil water , irrigation management , soil science , photosynthesis , botany , ecology , biology , physics , thermodynamics
Abstract Plant responses to salinity can be used to manage irrigation with brackish water. This study evaluated effects of brackish water irrigation on tomato ( Solanum lycopersicum L.) plants, proposed a new model to describe plant relative evapotranspiration (ET) and relative yield as a function of electrical conductivity of soil saturated paste extract (EC e ), and compared the estimations of the new model with four other models (linear model of Mass and Hoffman, and three nonlinear models of van Genuchten, Dirksen, and Homaee). A greenhouse experiment was conducted with five salinity treatments: tap water of EC 0.6, brackish groundwater of EC 2 and 3, and reverse osmosis (RO) of EC 4 and 6 dS m −1 . Results indicated no changes in leaf photosynthesis rate ( P n ), transpiration rate ( T r ), and stomatal conductance ( G s ) up to 2 dS m −1 irrigation water salinity. Nonlinear models better described tomato yield and seasonal ET. The proposed new model performed best when compared with four previous models to predict tomato yield and ET responses to salinity. The calculated soil salinity threshold values (EC e * ) from the new model were 1.73 dS m −1 for yield and 2.52 dS m −1 for ET. Data from published studies on effects of irrigation water salinity (EC w ) on tomato yield and ET were analyzed to validate models. The results showed that the new model was simpler and superior in estimating plant responses to EC w . Tomato is a salt‐sensitive crop, and irrigation with brackish waters adversely influences growth and ET.