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NR 251 Final exam
11-27 Final 251
11
Science
Undergraduate 3
12/09/2013

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Cards

Term
The height of capillary rise of water in soils is most directly related to the
Definition
A. pore size
B. particle density
C. bulk density
D. wilting point

A:PORE SIZE
Term
The speed of capillary rise in _______ texture soils would be quickest, but the total height would be greatest in _______ texture soils.
Definition
D. sand; clay
Term
What is a simple explanation as to why road salt kills plants?
Definition
c. water in soil is more strongly attracted to salt molecules than to root tips thus preventing plants from absorbing water
Term
Irrigation favorsh _______ roots
Definition
shallow and sparse
Term
Dry soil conditions favor____ over______
Definition
root growth over top growth
Term
Water moves from a ___ soil to a ___ soil
Definition
wet soild to dry soil
(to where it is held more tightly)
Term
4 ways to improve water intake and retention
Definition
Aeration
Subsoiling
Conservation tillage
Mulch
Term
3 things that increase water capture
Definition
Terraces
Contour tillage
Strip-cropping
Term
What soil type may have the greatest amount of available water
Definition
Silt-loam
Term
What soil texture may hold the greatest quantity of water?
Definition
Clay
Term
3 rules for essential elements needed for plant growth
Definition
The lack of the element stops growth or reproduction

The element is directly involved in plant nutrition ( not just taking up space)

A shortage of the element can only be corrected by supplying the element
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