When you know the actual sowing rate (Kg/Ha) and wish to calculate the theoretical plant population before doing an actual plant count:
Enter the Actual Sowing Rate in Kg/ha,
Enter the actual "thousand grain weight" (TGW) and germination % if you have them otherwise use typical values for the crop and variety.
Make a best estimate of field losses which have resulted from slugs, sub-optimum seedbed conditions or other factors,
The calculator will display the Estimated Population (plants/m²) that you can then verify by doing an in-field plant count.
Plant Establishment Calculator
When you have done an in-field plant count and you want to work out how successfully your crop has established:
Enter the Actual Sowing Rate in Kg/ha,
Enter the actual "thousand grain weight" (TGW) and the germination % if you have them otherwise use typical values for the crop and variety.
Enter the Actual Count (plants/m²). This should be based on the average of at least 10 representative sample counts.
The calculator will display the Actual Field Loss expressed as a percentage of the Target Population.
SEED REQUIREMENT PLANNER
SEED REQUIREMENT PLANNER - HELP
When you want to calculate the amount of seed to order (tonnes) for a field or cropping area:
Enter the target plant population you are trying to establish taking into account varietal characteristics, weed competition, anticipated sowing date etc,
Enter the actual "thousand grain weight" (TGW) and the germination % if you have them otherwise use typical values for the crop and variety.
Make a best estimate of field losses which may occur due to slugs, sub-optimum seedbed conditions or other factors,
Enter the field size or cropping area.
The calculator will display:
The required Sowing Rate (Kg/Ha) which can be used to calibrate the seed drill,
The total amount of seed you need to order,
The actual number of seeds being sown to achieve the target plant population.