Harvest index

• Harvest index (HI) is a measure of the proportion of total dry matter of a crop that represents economic yield.
• It is often reported as a percentage.

i.e. HI = economical yield/ biological yield

Absolute and relative growth rate

• It is the simplest measure of rate of increase in plant size, and is defined as increase in weight per unit time ( g DM/day).
• A more useful measure is the proportional or percentage change in plant size per unit time, known as relative growth rate (R).