agriculture

background

balls

benefits

black

carbamide

chemical

chemistry

circle

closeup

dangerous

ecology

environmental

factory

farm

farmer

fertilize

field

flake

garden

glass

grain

granule

growth

healthy

heap

humus

industrial

industry

laboratory

material

natural

nitrate

nitrogen

nourishing

nutrient

organic

pellets

phosphate

phosphorus

pile

plant

potassium

rural

seed

small

soil

sow

urea

white