The SI derived unit for mass spread rate is the: kilogram per square meter (kg/m2)
kilogram per hectare (kg/ha) = 0.0001 kilogram per square meter (kg/m2)
1 hectare (ha) = 10 000 square meter (m2)
1 acre (ac) = 4840 square yard (yd2)
kilogram per hectare (kg/ha) = 0.0001 kilogram per square meter (kg/m2)
1 hectare (ha) = 10 000 square meter (m2)
1 acre (ac) = 4840 square yard (yd2)