1. which of the following is the most appropriate an cost-effective method for s

Question

1. which of the following is the most appropriate an cost-effective method for soil sampling large areas?
a. taking and testing individual soil samples from each horizon
b. taking and testing one representative soil sample including all horizons
c. taking and testing one representative soil sample from each horizon
d. taking and testing one representative soil sample from each required layer of interest

2. a soil have a dry weight of 1127g and a volume of 800 cm^3. the true particle density for the soil is 2.0. how much water will the soil hold when it is saturated?
a. 236.5g b. 333.1g
c. 421.3g d. 452.7g

3. a soil test of a residential turf reveals 12.0 ppm of available nitrogen. the turf grass requires 4 pounds of nitrogen per 1000 sqft for the growing season. if the soil has a bulk density of 1.27kg/m^3. how much additional nitrogen will be needed?
a. 2.25 pounds/1000 sqft    b. 2.87 pounds/1000 sqft
c. 3.12 pounds/1000 sqft    d. 3.52 pounds/1000 sqft

4. which of the following best describes the amount of water between field capacity and PWP?
a. free water b. plant available water
c. soil solution    d. unavailable water

Explanation / Answer

1) The correct answer to this question is option "d" ,taking and testing one representative soil sample from each required layer of interest.

2) Bulk density = Dry mass/ Volume.

So, Bulk density= 1127/800 = 1.408.

Now, Porosity= 1- Bulk density/Particle Density.

So, Porosity= 1- 1.408/2

= 0.296

Again,

Porosity =w 2 - w1/ vol.

0.296 = w2- 1127/800

w2 = 1363.8

Hold of water= 800×2 - 1363.8

= 236.8

4) plant available water

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