Yield and Economics Calculators

Yield Calculator

  1. See how yield components affect yield.
  2. Then check below to see how crop management and the environment affect yield components.

Calculate how much yield to expect:
Enter # of spikes per sq m (usually between 300-600):
Enter # of grains per spike (often 25-35):
Enter the thousand grain weight (usually 33-48):
Your crop will yield approximately: t/ha

Remember: Build your yield

How do I manage spikes per square meter? Good plant stand and good tillering depend on good seed, good crop establishment, and good early water and nutrient management. After terminal spikelet (which occurs at about the same as stem at 1 cm), no more tillers will be formed.
How do I manage grains per spike? The maximum potential number of grains is determined at terminal spikelet. Water and nutrient stress seriously affect final grain number (especially nitrogen deficiency around terminal spikelet and water stress at flowering).
How do I manage thousand grain weight (TGW)? TGW is determined from heading on and is greatly affected by water stress during grain fill. Choose a planting time or irrigate your crop to avoid stress during flowering and grain fill.


Economics Calculator

Farmers want to know costs.
The following calculator estimates how much grain is needed to pay for a new practice.

Grain needed to pay for a new practice:
Enter the cost of the new practice:
local currency units
Enter the market price for grain:
local currency units per ton
You need approximately:
kg grain to pay for the new practice

Remember: Put risk into terms that a farmer can easily appreciate.