apes ch.13 Flashcards
famine
severe shortage of food in an area accompanied by mass starvation, death, econ chaos
plantation
form of industrialized agriculture used in tropical developing countries. cash crops
interplanting
growing several crops on the same plot simultaneously
polyvarietal
type of interplanting, involves planting a plot w/ genetic varieties of the same crop
agroforestry
crops and trees grown together
desertification
productive potential of dryland falls by 10 percent or more bc of climate changes that cuases droughts n reduction of topsoil
salinization
repeated application of irrigation water in dry climates leading to accumalation of salts in upper soil layer
soil conservation
ways to reduce soil erosion n restore fertility, keep soil covered w/ vegetation
terracing
growing food on steep slopes w/o depleting topsoil
strip cropping
planting alternative strops of a row crop and another crop that completely covers the soil. reduce eroision
green manure
freshly cut or groeing green vegetation plowed into the soil. increase organic matter/humus available for next crop
compost
organic fertilizer, produced when microorganisms in soil break down organic matter in presence of oxygen
feedlots
a plot of ground, often near a stockyard, where livestock are gathered to be fattened for market.
rotenone
natural pesticide, extracted from roots of tropical forest legumes
persistence
length of time that the substance remains in a particular environment before it is physically removed
