With regard to the mechanisms nutrient uptake in plants a. Root interception accounts for 1% of nitrogen taken up b. Mass flow accounts for 90% of phosphorus taken up c. Root interception accounts for20% of potassium taken up d. Diffusion accounts for 0% of potassium taken up The phenomenon of phosphate fixation takes place when a. The orthophosphate ion becomes reduced in acid soils b. Phosphoric acid ionizes in acid soils c. Phosphatic fertilizers are banded d. The orthophosphate ion becomes adsorbed to the surfaces of iron, aluminum and manganese hydrous oxides The phosphatase enzyme a. Does not function in the soil solution b. Is effective in the formation of organic phosphatic compounds c. Can be secreted by microorganisms to hydrolyze organic phosphates d. Is only secreted by microorganisms The dominant source of potassium in soils is a. Organic matter b. Mica and feldspars c. Illite d. Kaolinite
With regard to the mechanisms nutrient uptake in plants
a. Root interception accounts for 1% of nitrogen taken up
b. Mass flow accounts for 90% of phosphorus taken up
c. Root interception accounts for20% of potassium taken up
d. Diffusion accounts for 0% of potassium taken up
The phenomenon of phosphate fixation takes place when
a. The orthophosphate ion becomes reduced in acid soils
b. Phosphoric acid ionizes in acid soils
c. Phosphatic fertilizers are banded
d. The orthophosphate ion becomes adsorbed to the surfaces of iron, aluminum and manganese hydrous oxides
The phosphatase enzyme
a. Does not function in the soil solution
b. Is effective in the formation of organic phosphatic compounds
c. Can be secreted by microorganisms to hydrolyze organic phosphates
d. Is only secreted by microorganisms
The dominant source of potassium in soils is
a. Organic matter
b. Mica and feldspars
c. Illite
d. Kaolinite
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