Use Crop Growth Rate when you need to 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. Enter Elapsed time, Initial dry mass, Final dry mass, and Ground area using the definitions and units below so the result can be reproduced.

Elapsed time

A finite measured or assumed value, expressed in days.

Initial dry mass

A finite measured or assumed value greater than or equal to 0, expressed in g.

Final dry mass

A finite measured or assumed value greater than or equal to 0, expressed in g.

Ground area

A finite measured or assumed value, expressed in m².

The published tool contract uses this rule: 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.

Crop growth rate

The calculated crop growth rate in g/m²/day.

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 Elapsed time, Initial dry mass, Final dry mass, and Ground area values and their units alongside the result. Relative Growth Rate is useful when you instead need to compute plant relative growth rate RGR per day as (ln W2 - ln W1) / elapsed days from dry masses measured at two times. 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.

• Relative Growth Rate

  Compute plant relative growth rate RGR per day as (ln W2 - ln W1) / elapsed days from dry masses measured at two times.

• 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.

• Specific Growth Rate

  Calculate the specific growth rate in inverse hours from two counts.