SCSC 301 Exam 4 Questions With Correct answers
.____ and phosphorus interactions in strongly acid soils account, in part, for the low solubility of phosphorus in such soils - ANSWER-iron
.____ cannot be used as a liming material. - ANSWER-CaSO4
.____ is a material that can be added to soi...
SCSC 301 Exam 4 Questions With
Correct answers
.____ and phosphorus interactions in strongly acid soils account, in part, for the low solubility of
phosphorus in such soils - ANSWER-iron
.____ cannot be used as a liming material. - ANSWER-CaSO4
.____ is a material that can be added to soils to bring about a decrease in pH of 2 or more units -
ANSWER-Al2(SO4)2
.____ is not a possible source of available sulfur in soils. - ANSWER-Microbial fixation of the atmospheric
form
.____ is the form of nitrogen most subject to leaching losses from the soil - ANSWER-NO3-
.____ is the genus of bacteria responsible for the conversion of nitrite to nitrate in soils - ANSWER-
nitrobacter
.____ is the most abundant plant available form of phosphorus in soils of pH 6. - ANSWER-H2PO4-
.____ is the most oxidized form of sulfur in soils. - ANSWER-SO4-2
.____ is the principal mineral source of phosphorus in soils - ANSWER-Apatite
._____ is the most reduced form of sulfur in soils - ANSWER-S-2
.______ is a material that can be added to soil to bring about a sharp, permanent decrease in soil pH -
ANSWER-elemental sulfur
,.______ soils are most likely to be deficient in sulfur - ANSWER-acid, sandy
._______ has been an important source of sulfur in many soils - ANSWER-atmospheric pollution
._______ is a mineral source of potassium in soils. - ANSWER-Mica
.__________ is a genus of bacteria involved in 'non-symbiotic' nitrogen fixation. - ANSWER-azotobacter
.__________ is not a source of N for plants grown in the northeastern region of the U. S. - ANSWER-
mineral weathering
._______, ______, and ______are not recommended liming materials - ANSWER-CaO
Na2CO3
Ca(OH)2
._____% OM mineralized per year - ANSWER-2
.(Table) Phosphorus reversion would be greatest on this soil. - ANSWER-Highest pH
.(table) Residual P would be greatest in this soil. - ANSWER-pH 6-7
.(Table) The amount of potassium in the clay fraction would be greatest in this soil: - ANSWER-mica or
illite
.(Table) This soil has the greatest N-supplying power: - ANSWER-Highest organic matter
.(Table) This soil is most likely to contain calcium carbonate: - ANSWER-pH > 7.6
, .(table) This soil would be able to supply the greatest amount of N during a growing season: - ANSWER-
soil has highest OM
.(table) This soil would be the most likely to have both a K+ and SO4-2 deficiency: - ANSWER-soil has
sandy texture, acid pH
.(table) This soil would have the best pH for maintaining fertilizer P in a state of availability: - ANSWER-
soil with pH 6-7,
then highest OM
.(Table) This soil would have the best pH for maintaining fertilizer phosphorus in a plant available state: -
ANSWER-6-7 pH
.(table) This soil would require the greatest amount of limestone to increase the base saturation by 10%.
- ANSWER-soil with Highest CEC
.(table) This soil would require the least amount of limestone or sulfur to cause a 20% change in base
saturation: - ANSWER-lowest CEC (sesquioxides = 0)
.(table) This soils probably has the greatest amount of K-supplying power: - ANSWER-soil has mica, illite,
or feldspars
.(table)Banding of P fertilizer would be most prudent on this soil. - ANSWER-1. amorphous (andisols)
2. oxisols (sesquioxides)
3. ultisols (kaolinite)
.(table)Leaching losses of nutrients are least likely to occur in this soil: - ANSWER-soil with most clay
.(table)Leaching losses of nutrients are most likely to occur in this soil: - ANSWER-soil with least amount
of clay
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