overfishing
Harvesting so many fish of a species, especially immature fish, that not enough breeding stock is left to replenish the species, such that it is not profitable to harvest them.
Subject:
Chapter 13 - Food Resources
organic farming
Producing crops and livestock naturally by using organic fertilizer (manure, legumes, compost) and natural pest control (bugs that eat harmful bugs, plants that repel bugs, and environmental controls such as crop rotation) instead of using commercial inorganic fertilizers and synthetic pesticides and herbicides. See sustainable agriculture.
Subject:
nutrient
Any food, element, or compound an organism must take in to live, grow, or reproduce.
Subject:
net primary productivity (NPP)
Rate at which all the plants in an ecosystem produce net useful chemical energy; equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (gross primary productivity) and the rate at which they use some of that energy through cellular respiration. Compare gross primary productivity.
Subject:
monoculture
Cultivation of a single crop, usually on a large area of land. Compare polyculture, polyvarietal cultivation.
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micronutrients
Chemical elements organisms need in small or even trace amounts to live, grow, or reproduce. Examples are sodium, zinc, copper, chlorine, and iodine. Compare macronutrients.
Subject:
marasmus
Nutritional deficiency disease caused by a diet that does not have enough calories and protein to maintain good health. See kwashiorkor, malnutrition.
Subject:
malnutrition
Faulty nutrition, caused by a diet that does not supply an individual with enough protein, essential fats, vitamins, minerals, and other nutrients needed for good health. See awashiorkor, maramus. Compare over nutrition, under nutrition.
Subject:
macronutrients
Chemical elements that organisms need in large amounts to live, grow, or reproduce. Examples are carbon, oxygen, hydrogen, nitrogen, phosphorus, sulfur, potassium, calcium, magnesium, and iron. Compare micronutrients.
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low-input agriculture
See sustainable agriculture.
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Pages
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