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By D. Gale Johnson

E-book by way of Johnson, D. Gale, Hemmi, Kenzo, Lardinois, Pierre

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Extra resources for Agricultural Policy & Trade: Adjusting Domestic Programs in an International Framework

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Anoxic. (see also gleyed soil). : A soil having a low redox potential. Anoxygenic photosynthesis: Type of photosynthesis in green and purple bacteria in which oxygen is not produced. Antagonist: Biological agent that reduces the number or diseaseproducing activities of a pathogen. Antarctic Circle : Latitude of 66S South. The northern limit of the area of the Earth that experiences 24 hours of darkness or 24 hours of day at least one day during the year. Antarctic High: A region of high pressure that occupies central Antarctic throughout the year.

A group of soils geographically associated in a characteristic repeating pattern and defined and delineated as a single map unit. Associative dinitrogen fixation: Close interaction between a free living diazotrophic organism and a higher plant that results in an enhanced rate of dinitrogen fixation. Associative symbiosis : Close but relatively casual interaction between two dissimilar organisms or biological systems. The association may be mutually beneficial but is not required for accomplishment of a particular function.

The capacity, in inches, in a 60-inch profile or to a limiting layer is expressed as Class: Inches/inch Very low: o to 3 Low: 3 to 6 Moderate: 6 to 9 High: 9 to 12 Very high: More than 1 Available water capacity (AWe) : Loosely, the amount of water available for plants to use. Specifically, the volume of water released from soil between the time the soil is at field capacity (the maximum water held in soil against the pull of gravity) until the time it is at the wilting point (the amount of water held too tightly in soil for commonly grown crops to extract).

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