|Author:||Ben-Gal, A. ; Karlberg, L. ; Jansson, P. E. ; Shani, U.|
|Book Group Author:||NA|
Seasonal dependence of biomass production on transpiration has been previously reported for a number of crops under salinity and drought. Linear yield (Y) to transpiration (T) relationships have been utilized in plant-growth and water-uptake models to estimate yield based on predicted transpiration values. The relationship is often employed for time steps that are very small compared with the whole season measurements, even though no empirical validation exists for such application. This work tests the hypothesis that linear Y-T relationships are valid throughout the life span of crops under varied natural conditions and levels of environmental stress. Effects of salinity and water supply on growth, water use and yields of tomatoes (Lycopersicon esculentum Mill.) were studied for two distinct conditions of potential transpiration. Linear relationships between relative Y and relative ET were found to be consistent throughout the life span of the crops for both growing seasons. Water-use efficiency increased together with plant growth as a result of changes in the plant's surface area to volume ratio. This empirical validation of linear Y-T relationships for short time periods is beneficial in confirming their usefulness in growth and water uptake models.
|Pages:||211 - 218|
|Journal:||Plant and Soil|
biomass production, crop yield, drought, growth, plant waterrelations, soil salinity, tomatoes, transpiration, water use, water useefficiency, Lycopersicon esculentum, Lycopersicon, Solanaceae,Solanales, dicotyledons, angiosperms, Spermatophyta, plants, eukaryotes,Horticultural Crops (FF003) (New March 2000), Plant Physiology andBiochemistry (FF060), Plant Water Relations (FF062), Plant Production(FF100), Soil Chemistry and Mineralogy (JJ200), Soil Physics (JJ300)