Calculating soybean yields can be difficult. Plant spacing, soil types, environmental factors, insect and disease stress can all affect the final yield. Pod numbers, seeds per pod, and seed size will all control yield.
When do I begin counting?
The earliest time to begin yield counts is around R5-R6 stage with the R6 stage being preferred (a pod on any of the top four nodes of main stem full of seed.). By R6, all flowering will stop, pods have developed, and seeds in the pods are mostly filled. The accuracy of counts will always increase the closer you are to harvest.
Weed-free period in corn In corn this period occurs from V1 to V6 (1 to 6 leaf collars). Some sources will mention that it even begins at the VE stage (emergence). During this time the corn crop needs to stay clean. Weeds will affect yield
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