This publication provides general information on these tiny worm-like organisms. A more detailed description of the genera of nematodes that attack plants is provided as well as various methods to diagnose, discourage and treat against plant parasitic nematodes in a least toxic, sustainable manner. ATTRA Pest Management Technical Note.

This directory lists a range of soil testing labs and supplies that support the special analytical needs of farmers using organic or sustainable production methods. ATTRA Agronomy Resource List.

This paper describes soil organic matter, how it works to improve the soil, how to build it, characteristics of specific soil organic amendments, their production in Wisconsin, and guidelines for use. It covers Animal manures; Crop residues, spoiled hay and straw; Municipal yard waste; Wastes from dairy, vegetable, fish, meat and poultry processing industries; Wastes from paper mills, timber and paper products; Peat; and Compost. It also includes a short page on Biosolids (sewage sludge), a material not allowed in organic production. From UW-Madison Center for Integrated Agricultural Systems.

Literature citation from Agronomy Journal, 1998.

Green manures like alfalfa, clovers, and new legumes like chickling vetch are particularly important to organic farmers, because organic practices prohibit the use of synthetic fertilizer. This research on use of chickling vetch in rotations focuses on biomass, crop residue, root nodules (which indicate activity of nitrogen-fixing bacteria), and observations about wind and rain erosion. From MN Dept. of Agriculture's Greenbook 2004.