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Q.1
Nitrogen exists in many forms in the soil. Which forms have the most impact on water quality?
nitrate and ammonium
organic nitrogen and ammonia
nitrate and organic nitrogen
ammonia and nitrate
Q.2
Nitrous oxide, a contributor to climate change, can be emitted from soil or stored manure. Compared to carbon dioxide, nitrous oxide...
... has 296 times more impact as a greenhouse gas than carbon dioxide.
... has 4.6 times less impact as a greenhouse gas than carbon dioxide.
... has the same impact as a greenhouse gas as carbon dioxide.
... promotes cooling of the planet, while carbon dioxide promotes warming of the planet.
Q.3
In the year of application, crops typically take up...
... 90-95% of the applied nitrogen, 50-60 % of the applied phosphorus, and 35-55% of the applied potassium.
... 30-50% of the applied nitrogen, 10-30% of the applied phosphorus, and 35-55% of the applied potassium.
... 75-85% of the applied nitrogen, 30-50% of the applied phosphorus, and 20-60% of the applied potassium.
... 50-70% of the applied nitrogen, 10-30% of the applied phosphorus, and 20-60% of the applied potassium.
Q.4
Excess phosphorus in the soil can cause ...
... reduced uptake of zinc by the crop.
... reduced uptake of nitrogen by the crop.
... chlorosis of new leaves.
... delayed maturity of the crop.
Q.5
As soil becomes more acidic ...
... iron, aluminum, and manganese become less available to the crop.
... phosphorus, potassium, calcium, and magnesium become less available to the crop.
... zinc, manganese, boron, and copper become more available to the crop.
... potassium, calcium, manganese, and zinc become more available to the crop.
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