Seed purity.
When planting seed which is pure or with a high germination percentage, less seed is required. On the contrary, more seeds are required when using impure or mixed seeds.
Germination percentage.
Less seed is used when its germination percentage is higher. Seed of lower germination percentage is required in large amounts.
Spacing.
At closer spacing, more seeds are used than in a wider spacing.
Number of seeds per hole.
When two or more seeds are planted per hole, higher seed rate is required than when only one seed is planted per hole.
The purpose of the crop.
A crop to be used for silage making is spaced more closely than one meant for grain production. This would require use of more seeds. Maize to be used for silage making, for example, requires more seeds than that meant for production of grain.
monica20 answered the question on October 13, 2017 at 22:56
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