Assume an A horizon depth of 15 cm. A well drained silt loam soil on an Iowa farm has 3.5 organic matter which is about 5 N. Estimate the kg/ha of nitrogen that this soil horizon will make available for plant use from soil organic matter in one year (without the addition of fertilizer).
A) 38 B) 263 C) 175 D) 17.5 E) 88
Question 2
Ammonia losses are likely to be greatest if a nitrogen source is placed about 10 cm deep in ________.
A) a calcareous clay loam soil B) an acid, clay loam soil
C) a calcareous sandy loam soil D) an acid, sandy loam soil