Plant Nutrition Flashcards
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what is a pitcher plant large enough to catch a rat?
Nepenthes Rajah
N. Rajah environment?
lives in unproductive soil and uses carnivory to obtain nutrients such as calcium, potassium, and phosphorus
where do plants obtain most of their water and minerals?
upper layers of soil
how is soil classified?
size, from large to small; called sand silt, clay
soil horizons
how soil is stratified
topsoil
consists of mineral particles, living organisms, and humus (decaying organic material)
what prevents soil from leaching out out through groundwater?
cations binding to soil particles
humus
builds a crumbly soil that retains water but is still porous
topsoil
contains bacteria, fungi, algae, and other protists, insects, earthworms, nematodes, and plant roots
cause of 1930s American Dust Bowl
soil mismanagement
what % of farmland has reduced productivity globally?
30%
sustainable agriculture
goal is to use farming methods that are conservation-minded, environmentally safe and profitable
what % of global freshwater use is
devoted to agriculture
75%
primary source of irrigation water
75%
primary source of irrigation water
aquifers
land subsidence
caused by depletion of aquifers
fertilization
replaces mineral nutrients that have been lost from the soil
what are commercial fertilizers enriched in?
nitrogen, phosphorus, potassium
what does soil pH affect?
availability of minerals
phytoremediation
biological, nondestructive technology that reclaims contaminated areas