Use Transpiration Rate when you need to compute the transpiration rate in millimoles of water per square metre per second from water loss and leaf area. Enter Water loss and Leaf area using the definitions and units below so the result can be reproduced.

Water loss

A finite measured or assumed value greater than or equal to 0, expressed in mmol/s.

Leaf area

A finite measured or assumed value, expressed in m².

The published tool contract uses this rule: Compute the transpiration rate in millimoles of water per square metre per second from water loss and leaf area.

Transpiration rate

The calculated transpiration rate in mmol/m²/s.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small.

Retain the original Water loss and Leaf area values and their units alongside the result. Net Photosynthesis Rate is useful when you instead need to compute the net photosynthesis rate in micromoles of carbon dioxide per square metre per second from uptake and leaf area. Net Assimilation Rate provides another view by helping you compute the simplified net assimilation rate in grams per square metre of leaf per day as dry mass gain divided by average leaf area times elapsed days.

• Net Photosynthesis Rate

  Compute the net photosynthesis rate in micromoles of carbon dioxide per square metre per second from uptake and leaf area.

• Net Assimilation Rate

  Compute the simplified net assimilation rate in grams per square metre of leaf per day as dry mass gain divided by average leaf area times elapsed days.

• Crop Growth Rate

  Compute crop growth rate in grams per square metre of ground per day as standing dry mass gain divided by ground area times elapsed days.