Grass clippings from a healthy lawn can be expected to contain approximately ________ N (on a dry weight basis).
A) 3.0 B) 0.2 C) 0.5 D) 0.01 E) 7.5
Question 2Of the various types of drain systems, open ditch systems are most practical and economical for use on:
A) soils which do not freeze during the winter.
B) Vertisols.
C) clay soils with poor drainage.
D) soils with a deep water table.
E) poorly drained soils with sandy profiles.
Question 3Applied to agricultural crops, the term lodging refers to:
A) plants falling over, often as a result of too much N.
B) plants losing their leaves because of a N imbalance.
C) pre-mature fruit drop as a result of N deficiency.
D) short, stubby plants starving for N or S.
E) infestation with a high number of insect larvae lodged in the fruits or seeds.
Question 4Drainage pipe comes in 200 ft long rolls. The number of rolls needed to construct a uniform buried drainage system for a nearly level 20 hectare field will depend primarily on:
A) the annual rainfall.
B) rate of capillary movement in the soil.
C) the texture and structure of the soil.
D) the saturated moisture potential of the soil.
E) the slope of the drain lines.
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