631 Specific techniques; apparatus, equipment, materials
631.5 Cultivation and harvesting
631.51 Soil working (Tillage) 631.52 Production of seeds, bulbs, tubers, new varieties 631.53 Plant propagation 631.54 Grafting, pruning, training 631.55 Harvesting 631.56 Operations subsequent to harvesting 631.57 Varieties and kinds of organisms used in agriculture 631.58 Special methods of cultivation
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