On the deficiencies that may occur in soilless floriculture, and how these can be remedied.

Indian Agricultural Resources. Information about manures, organic, inorganic and biofertilizers.

Offers a database and search function of a range of articles about fertilizers, micronutrients and fertilizer application.

A student paper describing soil conditions in forests. Particularly what causes the pH to change and what influences this will have on the ecosystem.

Gives detailed description of the soil and fertilizer requirements of forage crops during establishment and maintenance. University of Pennsylvania.

Application recommendations for different fertilizers.

A program by PotashCorp to address misconceptions about fertilizers and the role of the fertilizer industry. Detailed description of fertilzer use and production. Many downloads and a quiz.

Soil fertility management for forage crops. A introduction from the Penn State University's Agronomy Department.

Describes the results of a long-term field experiment in Sweden. By Artur Granstedt and Lars Kjellenberg.

A detailed description from the International Centre for Integrate Mountain Development. Its main focus is on mountain soils and sloped agriculture in th Hindu-Kish region.