英文關鍵字
agricultural
agriculture
agronomy
background
blackened
blue
buries
burrowing
continuous
crawler
crops
cultivation
cultivator
depth
dust
early
embedding
equipment
farm
farmer
feed
field
grain
grinding
harrow
heavy
implements
land
machine
machinery
meadows
mechanical
outdoor
plant
plow
plowed
plowing
plows
preparation
presowing
processing
refreshment
residues
season
seeder
seeds
sky
soil
sowing
spring
tillage
towing
tracked
tractor
vehicle
wheeled