Table 1.
Daily mean values of main meteorological factors including air temperature (Ta), relative humidity (RH), solar radiation (Rs) and vapor pressure deficit (VPD) during the period from April 8 to 15, and from June 8 to 15, 2012/2013 in greenhouse.
Fig 1.
Dynamics of stem diameter variation (SDV) in tomato during one drying cycles (from FC to wilting point).
Data were collected during a drought experiment conducted from June 22 to 30.
Fig 2.
Dynamics of maximum daily shrinkage (MDS) in stem diameter under different growth pattern.
Dynamics of MDS during rapid vegetative growth stage of tomato plant from April 8 to 15, 2012 (a) and dynamics of MDS during harvesting stage of tomato plant from June 8 to 15, 2012 (b) in different water treatments (open triangles △: 50–60%FC; open circles ○: 60–70% FC; closed circles ●: 70–80%FC). Each point is the mean of three measurements. Asterisks **indicate statistically significant differences between treatments by LSD0.01. Vertical bars correspond to the standard error of observations.
Fig 3.
Relationship between variation differential in stem diameter at 06:00 (SD6) and relative soil water content (SWC) during rapid growth stage of tomato plant in greenhouse.
Correlation equation is y = -2.0721x2+4.0684x-1.8121; determination coefficient (R2) = 0.9091. Data were collected from April 8 to May 6.
Table 2.
Correlation between SD6 at rapidly growing stage and meteorological factors in greenhouse.
Table 3.
Relationships between SDV-derived indices and SWC at different growth stages of tomato.
Table 4.
Threshold values in SD6 at rapid vegetative growth stage and threshold values in MDS at slow vegetative growth stage for diagnosing plant water status of tomato.
Table 5.
Relationship between MDS at slow vegetative growth stage of tomato and micrometeorological factors in greenhouse.
Fig 4.
Correlation between MDS values calculated from reference equation and actual measured MDS values.
Correlation equation is y = -0.9133x2+0.0142x-1.8121; determination coefficient (R2) = 0.9133.
Fig 5.
The relationship between stem diameter variation (SDV) and both leaf water potential (a) and leaf relative water content (b). Correlation equations are y = -20.339x-39.918 and y = 24.004x+50.489, respectively; determination coefficients (R2) are 0.7517 and 0.9312, respectively. Data were from the season in 2011/2012.