FAO Agricultural Services Bulletin, المجلدات 82-86

additional adjustment administrative agricultural amount animals areas bricks building calculation carried caused Chapter clay climate concrete conservation costs countries cover crop insurance cultivation damage depends disc draught economic effect engineering equipment erosion established estimated example factors farm farmers fertilizer field Fund given harvest implements important improve increase indemnities labour less limited loss machinery major manufacturer materials mechanization normally occur operations organic matter percent period placed planning planting plough possible practices premium present problems processing production programme protection purlins reduced regions reinsurance renovation replacement residues result risk sand scheme season sector seed selection shows soil structure sugar surface Table temperature tillage tractors unit usually wall weeds wind yield