Exam revision 1 Flashcards
Which of the following does NOT affect the rate of diffusion of mineral nutrients through soil?
Soil water content The degree of soil compaction Root density Soil porosity Soil temperature
Root density
T/F: Leaching of nutrients reflects movement by mass flow in soil?
True
Which is true in soil:
Both anions and cations are equally prone to leaching
Anions are more prone than cations
Cations are more prone than anions
Anions are more prone than cations
T/F: In woody perennial species, the fine root system shows largely seasonal variation in growth and is largely responsible for nutrient uptake.
True
Which are ESSENTIAL nutrients for plant growth? Mg Zn S Se Al N Mn K Pb
Mg Zn S N Mn K
Which of the following are micronutrients? S Ca Mo Cu B K Co Cl Se
Mo Cu B Co Cl Se
Which of the following nutrients are generally considered immobile in soils? Nitrate (NO3-) Phosphate Boron Potassium Sulphate Calcium (Ca2+) Zinc
Phosphate
Potassium
Zinc
Which of the following are potential nutritional problems of acid soils? S deficiency Al toxicity B toxicity Mo deficiency Mn toxicity Mn deficiency Zn deficiency
S deficiency
Al toxicity
Mo deficiency
Mn toxicity
Which of the following may be encountered in alkaline soils? S deficiency Mn toxicity Ca deficiency B toxicity Fe deficiency Cu deficiency
B toxicity
Fe deficiency
Cu deficiency
T/F: The cation-anion balance at the root surface is a contributing factor to changes in soil pH?
True
Ash-alkalinity measures: The [cation] of plants The [anion] of plants The balance in uptake of cations and anions The pH of ash after combustion None of the above
The balance in uptake of cations and anions
T/F: Transient deficiencies of some nutrients can be caused by low soil temperature, because of low rate of diffusion of nutrient through the soil.
True
Nutrient uptake in cold and wet soils can be due to:
Low rates of mineralisation from low microbial activity
Slow rates of diffusion of the ion through the soil
Slow rates of root elongation
All of the above
None of the above
All of the above
