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Manures, Fertilizers and Soil FertilityAmazon$79.99
Soil Fertility and Fertilizers: An Introduction to Nutrient ManagementAmazonSAVE $468.26
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Soil Fertility and Fertilizers: An Introduction to Nutrient Management, 8th ed.Amazon$29.60
Eco-Farm, An Acres U.S.A. Primer: The definitive guide to managing farm and ranch soil fertility, crops, fertilizers, weeds and insects while avoiding dangerous chemicalsAmazonSAVE $1.50
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Unco Industries Wiggle Worm 100% Pure Organic Worm Castings Fertilizer, 15-Pounds - Improves Soil Fertility and Aeration for Houseplants, Vegetables, Gardens, and More – OMRI-Listed and Mineral-DenseAmazon$9.97
Worm Castings for Plants, Earthworm Casting Organic Fertilizer, Bokashi Booster, Worm Tea Made from Compost Worms, Liquified & Concentrated Vermicompost for Soil Fertility & Bountiful Harvest, 8 oz.Amazon