1. Which of the following soils can be found in the delta region of California?
ID: 289678 • Letter: 1
Question
1. Which of the following soils can be found in the delta region of California?
a. mineral b. organic
c. imported d. none of these
2. Soil misuse includes:
a. leaving soil bare b. increased compaction by excess traffic
c. acidifying soils with fertilizers. d. irrigation without proper drainage
e. all of these
3. A soil composed entirely of primary minerals and containing all other minerals present in parent material can be classified as:
a. Young soil b. old soil
c. organic soil d. none of these
4. Which of the following types of pores are most desirable in the soil profile?
a. macropores b. micropores
c. nanopores d. mesopores
Explanation / Answer
1. Organic Soil
2.Soil misuse includes:
Leaving soil bare: When the field dries out, the surface becomes hard and crusted and is prone to further erosion by water and wind. The organic matter declines and nutrients can be lost through leaching even on fields not subjected to water erosion.
Increased compaction by excess traffic: Compaction decreases the porosity and permeability of soil, which reduces the circulation of water or nutrients through soil. this inturn affects the organic life in soil, reducing the productivity of the soil.
Acidifying soils with fertilizer: Fertilizer increases yields, but that increase is at the cost of abundance. High yield of a single crop actually serves to negatively impact upon the health of a soil. A Single species does not use all the fertilizer: it is unable to absorb everything that is in the product. This means a signifcant proportion of the fertilizer remains in the soil after the crop has been harvested. The accumulation of some of these chemicals changes soil composition and disrupts the balance of microorganisms in the soil.
Irrigation without proper drainage: Stagnant water can be a boarding place for bacterias the can damage the crops. The nutrients supply can be consumed by these bacterias and the organice matter decreases.
Thus the answer is all of the above.
3. Young Soil
4. Soil pores exist between and within aggregates and are occupied by water and air. Macropores are large soil pores, usually between aggregates, that are generally greater than 0.08 mm in diameter. Macropores drain freely by gravity and allow easy movement of water and air. They provide habitat for soil organisms and plant roots can grow into them.
Macropores
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