BIOL 111 Study Guide - Final Guide: Soil Salinity, Micronutrient Deficiency, Soil Conservation
8 Mar 2016
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How is food produced: humans depend on three systems for their food supply: Croplands mostly produce grains, and provide about 77% of the world"s food. Rangelands produce meat, mostly from grazing livestock, and supply 16% of the world"s food. Ocean fisheries supply 7% of the world"s food and 6% of the protein in the human diet: our food production systems (agro-ecosystems) are different from natural ecosystems: This type is practiced on about of all croplands, mostly in developed countries. Plantation agriculture involves growing cash crops (bananas, coffee, cocoa, and vegetables). An increasing amount of livestock production is industrialized in densely-populated feedlots: traditional (low-input) agriculture is practiced by 40% of people, providing 1/5 of the world"s food. Traditional subsistence agriculture uses human labor (shifting cultivation & nomadic herding). In traditional intensive agriculture, farmers use fertilizer and machines to get a higher yield.
