Agronomy 180 - Assignment 8 - part 1 and 2 | Questions And Answers Latest {2024- 2025}
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At the global scale, organisms at the ocean surface almost produce as much total photosynthesis as
plans over the land. - True
What do the brackets mean in [CO₂]? - Concentration of CO₂
which are autotrophs? - Plants and algae
Nitrogen mineralization rates vary with soil temperature and moisture. - True
Which component of the Soybean nitrogen Cycling/Budget is NOT found in the Corn Nitrogen
Cycling/Budget? - Atmospheric fixation
In a soybean field in Iowa, over one year 35 lbs N per acre (35 lbs N acre ^-1) are leached to water.
Convert this quantity into kg N per square meter (kg N m^-2). Assume 1 kg = 2.21 lbs and 1 acre = 4017
m ^2. - 3.91 x 10^-3 kg N m^-2
Using the question above. what would the average nitrate concentration in the water be [mg N/kg H₂O
or mg N/I H₂0] if the same soybean field had 391 mm of drainage over the same time period? (Hint
calculate the mass of water drained, and divide the mass of N leached by that number, keeping in mind
how much a mm of water weighs spread over a m²) - 10 mg N/kg H₂O or mg N/I H₂O
There is no real issue with the timing of soil. nitrogen cycling and plant uptake in Iowa cropping systems.
all water quality problems associated with nitrate leaching can be solved by reducing nitrogen fertilizer
application - False
based on the diagram provided in your notes, select the component(s) of the nitrogen cycle that exhibit
the largest range in potential value(s). - Microbial production of nitrate from native soil; Microbial re-
uptake of nitrate
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