Exam 13: Practical Nutrient Management

The place where the manure pile was stored last year, a narrow strip that used to be a limestone gravel farm road, and the spot where fertilizer is usually transferred from a nurse truck to the tractor spreader are all examples of parts of a 25 hectare field that should be treated as follows when sampling soil for the soil test lab.

The PSNT nitrogen soil test is designed to be used in growing _____.

Consider the data in the accompanying Table giving the average height of 10 trees planted in order to revegetate a disturbed soil. What was the most limiting factor for tree growth on this soil?

In recent years, a soil test for nitrogen has been developed and widely used in humid regions in predicting how much nitrogen will need to be applied to supplement natural mineralization in the soil. This test is called the _______.

As runoff water flows across a grassed buffer strip, the concentrations of N and P in the water decrease slowly at first, but if the buffer strip is sufficiently wide, major reductions in these concentrations will occur just before the water leaves the buffer.

Routine soil testing on a regular basis allows landowners to monitor most changes in soil quality.

Modern nutrient management is designed to _____________.

Soil test interpretations have been developed so that for most fields testing "high" in a nutrient, addition of that nutrient will not increase yield enough to more than pay for the cost of applying the nutrient.

The nutrient element magnesium is often supplied by which type of application?

If soil test results for P are available, the optimum amount of P fertilizer to apply to a crop can be best recommended by __________.

The forestry industry uses fertilizers most often to treat old growth stands that will produce valuable lumber

When banding fertilizer, the material should be placed about 1 or 2 cm below the seed being planted.

Soil test interpretations have been developed so that for most fields testing "low" in a nutrient, addition of that nutrient will increase yield enough to more than pay for the cost of applying the fertilizer.

Based on the data given in the Table, if the revegetation site were limed and fertilized with nitrogen, would you also recommend the addition of P fertilizer to improve tree growth?

Land application of treated sewage sludge is an effective means of recycling nutrients back to the soil from which they were originally taken.

For most plants the relationship between plant tissue concentration of a nutrient and the dry matter production of the plant is linear until toxicity begins to have an effect.

Buffer strips are usually a last-resort mechanism of pollution control because of their expense and unfavorable side-effects.

Most synthetic chemical fertilizers are inorganic salts.

To enable the most consistent and appropriate interpretations, all soil samples submitted to a particular soil test lab should be taken from the same soil depth, regardless of differences in the type of tillage used or plants grown.

Of the macronutrients, which can be most correctly said to be a renewable resource?