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Simulating water and potassium uptake of greenhouse tomato as a function of salinity stress

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Abstract

Knowledge regarding uptake of water and nutrients as a function of their status in the soil is critical for smart fertigation management. Of particular interest is the uptake of water and potassium (K), each as a function of root zone salinity. The objective of this study was to quantify the response of tomato water uptake (transpiration) and K uptake to varied levels of K availability combined with salinity. Two independent lysimetric experiments were conducted and used to calibrate and validate models for water and K uptake under varied soil salinity. Tomato water and K uptake were determined by water and nutrient balance using the measured soil water content and K concentration in soil and drainage solution. Tomato water uptake was affected by root zone soil K and salinity. Salinity was the dominant factor driving uptake when irrigation solution had NaCl concentration of over 3 g L–1. Potassium uptake of tomato decreased with decreasing soil K content and increasing soil salinity. The linear relationship between tomato water uptake and K uptake rate was not influenced by soil salinity, indicating that the inhibition of K uptake was probably due to passive uptake of K with the flux of water from soil to roots decreased due to salinity. Tomato water and K uptake were simulated considering the effect of soil solution K concentration under simultaneous K and salinity stresses. Simulated daily average water and K uptake rates agreed well with measured values, with root mean squared error, normalized root mean squared error, and index of agreement of 144 cm3 d–1, 20.13% and 0.99 for average daily water uptake; and 24.43 mg d–1, 29.78% and 0.98 for K average daily uptake rate, respectively. These findings can be used to predict crop water and K requirements under combined salinity and K status conditions, which should contribute to efficient and sustainable fertigation scheduling.

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Abbreviations

K:

Potassium

DAT:

Days after transplanting

RMSE:

Root mean square error

NRMSE:

Normalized mean square error

IA:

Index of agreement

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Acknowledgements

This study was completed while Lichun Wang was visiting the Gilat Research Center of Israel’s Agricultural Research Organization—Volcani Institute. We thank Inna Faingold, Ludmila Yusopov, Riva Gavrilov, and Ron Best for their valuable contributions to the experiment.

Funding

Dr. Lichun Wang was supported by the National Key Research and Development Program of China (2019YFE0125100), the National Natural Science Foundation of China (Project No. 51509005). The project was funded by the Center for Fertilization and Plant Nutrition (CFPN; www.cfpn.center). Funding was provided by Beijing Science and Technology Planning Project (Grant No. Z211100004621006).

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Correspondence to Alon Ben-Gal.

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Wang, L., Yermiyahu, U., Yasuor, H. et al. Simulating water and potassium uptake of greenhouse tomato as a function of salinity stress. Irrig Sci 40, 873–884 (2022). https://doi.org/10.1007/s00271-022-00812-z

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  • DOI: https://doi.org/10.1007/s00271-022-00812-z

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