The leaf area index significantly affects the solar radiation reaching the soil surface.
Indicate whether the statement is true or false
Question 2The sulfur dioxide in the atmosphere:
A) is a major contributor to acid rain.
B) can be an important source of sulfur nutrition for plants.
C) comes from fires such as fossil fuel burning, volcanoes and forest fires.
D) all of the above
E) none of the above
Question 3Most irrigation systems are very inefficient with less than half the water that is taken from streams ever reaching the plants.
Indicate whether the statement is true or false
Question 4Drip irrigation would more likely be used in the production of apples or peaches than in the production of wheat.
Indicate whether the statement is true or false
Question 5Applying heavy dressings of N fertilizer will tend to produce sugary-sweet fruits and vegetables.
Indicate whether the statement is true or false
Question 6Nitrification requires the presence of a source of readily available carbon, such as manure.
Indicate whether the statement is true or false
Question 7Recent research with annual crops such as wheat, sunflower and sorghum in the Great Plains region suggests that, compared to continuous cropping, soil quality, crop productivity and farm profitability are likely to be greater when crops are grown in a field only every second year with the soil kept free of weeds in the non-crop year by repeated cultivation of herbicide application.
Indicate whether the statement is true or false
Question 8Ammonium fixation occurs to the greatest extent in the O and A horizons.
Indicate whether the statement is true or false
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