(i) Intended use of the crop: e.g. fodder maize requires high seed rate than grain maize.
(ii) Germination percentage: high seed rate is required for seeds with low germination percentage.
(iii) Method of planting: broadcasting requires high seed rate than row planting.
(iv) Number of seeds per hole: two or more seeds per hole requires more seed rate than one seed per hole.
(v) Soil fertility: poor/infertile soils require low seed rate because crops are widely spaced compared to fertile soils.
(vi) Growth characteristics of the crop: tall/tillering/jndeterminate varieties require low seed rate compared to short/ less tillering/determinate varieties.
(vii) Spacing: high seed rate is required in closer spacing than wider spacing.
(viii) Seed purity: impure seed/containing chaff and foreign materials will lead to high speed rate compared to pure seed.
(ix) Pure/mixed stand: high seed rate for pure stand and low seed rate for mixed stand,
Mohaissack answered the question on October 10, 2017 at 11:33