Agvise Laboratories (Popularity: )

Offers testing services for soils, water, and plant tissue. Website has a number of technical ...
Category: Science\Agriculture\Instruments and Supplies

ABC Organics (Popularity: )

California firm providing consultancy services, expertise, and products for organic growers.
Category: Science\Agriculture\Sustainable Agriculture\Organic Farming

Efficient Fertilizer Use Manual (Popularity: )

Comprehensive online book about proper fertilizer uses, soil pH and soil sampling.
Category: Science\Agriculture\Soils\Soil Fertility and Fertilizers

Soil Fertility (Popularity: )

A large collection of information ranging from soil test interpretation to prevention of nutrient deficiencies.
Category: Science\Agriculture\Soils\Soil Fertility and Fertilizers