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he most important factor affecting the availability of these nutrients is soil pH, a measure of the amount of hydronium ion (H+) that is present in solution. Pure water has a neutral pH of 7, lower values mean that the solution is acidic and soils with pH higher than 7 are alkaline. Different crops vary in their response to acid and alkaline soil conditions (Mathers, 2001). However, for most field crops, slightly acidic (pH = 5.6) to neutral soils are optimal for growth. Soil pH affects plant growth and productivity indirectly because, depending on the nutrient, availability is affected which can result in nutrient deficiency or nutrient toxicity. In higher pH or alkaline soils, result in deficiencies in the essential micronutrients iron, zinc, and manganese. Soil pH of less than 5.5 is already considered strongly acidic and will not support growth of economically important crops. Thus, the right soil pH is a requirement for maximum yield production.
The development of acid soils has been due to high weathering brought about by warm temperatures and rainfall, and manmade events like the continuous use of nitrogen fertilizers and acid rain effects. At pH below 6 or under acidic soils, increased availability of micronutrients like iron, manganese, zinc , copper and aluminium result in toxicity symptoms (CSIRO Plant Industry, 2004); while decreased availability of phosphorus results in deficiency of this element . This is very true in humid countries where soil acidity is often associated with low crop productivity (Schroth, Lehman, & Barrios, 2003).
The class was divided into eight groups. Each group was asked to bring soil samples from the area near their residence. In the laboratory, the pH and temperature of pure water was determined. After adding water to the soil and mixing the slurry, the pH and temperature of each sample were measured. Mean values of the soil pH of each group were determined, and the hydronium ion concentration was calculated using the
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Physical aspects deal with requirements such as light, moisture and temperature. The chemical aspect entails properties of pH levels, and mineral composition while biological involves the relation to other biological aspects such as animals and plants within the same habitat.
After analysis of the results it is found that the second method - the balanced Wheatstone bridge one - is more accurate. Explanations are furnished in the conclusion as to why this is so. It is also recommended that a balanced Wheatstone bridge with an amplifier be tried out as a measuring entity.
The results yielded a significant relationship between mass and volume at ‘0.05 level of significance’ and a corresponding p value of 0.0009. The results also identified an experimental density of 7.54 g/mL for the pennies
In addition, introductions section provides hypothetical proposition of each experiment together with brief description of procedures involved. Methodology section provides detailed description of procedures and steps employed in carrying out
The results of changing the varying the frequency of the output signal, the independent variable, on the values of the input signal is shown in forms of waves of various frequencies and wavelengths. This project shows the use of normal visible light as input signal and
The molar mass determination process requires complemented efforts of definite gas laws, especially Avogadro’s gas principles and Archimedes’ buoyancy laws. Archimedes laws facilitate determination of floating and sinking of an