54. is affected by soil texture, structure, and organic matter . 55. does not affect the rate of water movement in soils. Roughly 90 percent or more of the negative charge in is pH dependent. 61. humus 62. Fill-in each space below with the correct word or words.
Correct answers are in red .
Where there is more than one acceptable answer, the additional correct answers are in blue . An accepted generalization is that it is time to irrigate when 50 percent of the available water in the root zone has been used. Surface mining or open pit mining or strip mining is the process of extracting coal from operations on the surface of the earth, not from operations in underground openings. The earth material between the soil and the coal is called overburden or spoil . The strength of adsorption with which a cation is held or adsorbed to negatively charged soil particles increases as the valence or charge on the cation increases.