Fertilizers

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Nitrogen soil tests are _____________ for making nitrogen fertilizer recommendations.
1. frequently used
2. not used
3. incorrect
4. none of the above
In the absence of soil test recommendations, apply _______ pound(s) of actual nitrogen fertilizer per 1,000 square feet of lawn at one time.
1. 1
2. 2
3. 3
4. 4
Organic combinations of elements must be reduced to some soluble, inorganic form before_________________.
1. converted to fertilizer
2. composting
3. being absorbed by plants
4. all of the above
Nitrogen is present in soils in the form of _________________________.
1. nitrate
2. ammonium
3. a component of soil organic matter
4. all of the above
A ___________________ is a slowly available form of iron.
1. slurry
2. fertilizer concentrate
3. chelate
4. compressed fertilizer pellet
Of all the fertilizer nutrients, ________________________ generally produces the greatest growth response in plants.
1. nitrogen
2. phosphorous
3. potassium
4. magnesium
The numbers 10-10-10, 10-5-10, 24-3-3, 15-30-15 etc. (in this order) stand for the percentage of _____________________ in a fertilizer.
1. phosphorous, potassium, nitrogen
2. nitrogen, phosphorous, potassium
3. nitrogen, Iron, Zinc
4. nitrogen, potassium, phosphorous
Inorganic phosphorus moves _______________ in soil.
1. very little
2. frequently
3. upward
4. rapidly downward
The major sources of phosphorus in runoff are from_______________________.
1. water moving over bare soil
2. lawn clippings and tree leaves left in streets and gutters
3. soil from wind erosion
4. all of the above
A routine soil test is recommended to determine existing soil phosphorus levels before ___________________________.
1. tilling beds
2. selecting a fertilizer
3. planting
4. adding organic matter
_______________________ are the two fertilizer nutrients which pose the greatest risk for contamination of surface and groundwater.
1. Iron and zinc
2. Nitrogen and potassium
3. Nitrogen and phosphorus
4. None of the above
Water with over ____________ part(s) per million nitrate-nitrogen can create (methemoglobinemia) an inability among infants to use oxygen.
1. 1
2. 3
3. 5
4. 10
In the absence of soil test recommendations, fertilize landscape areas at a rate of _______________ pounds of actual nitrogen per 1000 square feet of bed area.
1. 1 to 2
2. 2 to 3
3. 3 to 4
4. 4 to 5

Fertilizers

Aggie Horticulture®