Harvest index
A ratio representing the efficiency of a crop in converting its total biomass into the harvested economic yield.
Также говорят: HI, economic yield efficiency, coefficient of economic effectiveness
The harvest index (HI) measures the proportion of grain or fruit mass relative to the total above-ground biomass of the plant. It serves as a vital performance indicator for agronomists to determine how effectively a crop partition nutrients into its yield components.
In practice, this metric is utilized during variety selection and post-harvest analysis to evaluate the success of an agronomic strategy. A higher index generally implies that the plant is allocating more resources to reproductive growth rather than vegetative growth. It is typically calculated at physiological maturity.
A common mistake is focusing solely on total biomass growth without tracking the allocation towards grain production. Excess nitrogen application can stimulate heavy foliage but may decrease the harvest index if grain filling is not supported. Optimal management focuses on balanced nutrition to maintain a stable and high harvest index across varying seasonal conditions.