Download e-book for kindle: An Introduction to Scientific Research by E. Bright Wilson Jr.

By E. Bright Wilson Jr.

ISBN-10: 0486665453

ISBN-13: 9780486665450

Famous scientist's highly transparent, pragmatic advisor to rules and systems important in quite a lot of sciences. layout of experiments and gear; type, sampling and size; research of experimental facts; blunders of size; likelihood, randomness and common sense; even more. fundamental for any researcher. 1952 variation. forty nine illustrations.

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Rates and Location of Phosphogypsum Application The optimal amounts and methods of application of PG were studied by Agassi et al. (1982) on five soils from Israel that ranged in clay content from 17 to 53% (Figure 16). They concluded: (1) Spreading PG over the soil was more beneficial than mixing to a depth of 5 mm because when mixed only one-fifth is available in the upper 1 mm of soil where the crust is formed (Figure 16B). In soils where crust formation and IR are problems, incorporating the PG with the soil by disk or plow should be discouraged.

This is not the case when PG is added to the soil, because a relationship between runoff and slope angle is not apparent while final IR increases with slope angle. 8) between slope angle and cumulative infiltration exists with a decrease in runoff as the slope angle increases. The effect of slope angle and PG treatment on soil loss is presented in Figure 25C. Increase in slope angle from 5 to 25% resulted in increased soil losses of 668% for the untreated and 190% for the PG-treated soils, respectively.

The relatively high EC in the runoff water (10 cmol( +) 1-1) flocculates and promotes deposition of clay particles. (Miller (1987a), analyzing the effect of PG on sediment particle sizes in the runoff water, found 15-30% clay and 60-75% silt in control treatments whereas PG-amended soils showed no clay-sized sediment in the runoff water. Phosphogypsum treatments therefore enhance sediment deposition processes, resulting in lower soil loss. 3. Effect of Steep Slope and PG on Soil Loss The water erosion processes require a slope gradient to transport sediment.

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