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This is the degree of acidity or alkalinity f a soil. This depends on hydrogenous concentration.
The pH range is experienced using a number line.
In the soil solution with greater H+, it will be acidic and the smaller the number, the more acidic soil is e.g. 5.8 is a weak cid and 3 is strong acid.
Alkalinity increases with increasing numbers e.g. 8 is a weak alkaline 12.5 is strong.
Importance of soil ph
Determining Soil pH
There are two methods:
Use of a pH meter
This is an expensive equipment do its not used in schools.
Colour dye indicators
A Clear area will be seen in the middle of the cylinder. It will be placed against the coloured chart where different colours represent pH ranges and results filled in the table.
Causes of soil Acidity
Parent Rock: from which soil has been formed granite soils from which sandy soils have been formed, have excess silica which can – with water to form a silicic acid making sandy soil acidic.
Rain water: Carbon dioxide in the atmosphere can be dissolved in rainwater to form a weak acid i.e. carbonic acid which flows into the soil.
Application of acid forming fertilizers: Every ammonium sulphate, sulphuric acid are used by plants i.e. CNH4 SO4 + HO2 = 2HNO3 + H2SO4 + H2O
Removal of Soil Acidity
Addition of agricultural lime e.g calcium carbonates, calcium hydroxide.
Effects of Agricultural Lime:
Over liming Injury
It will take soil pH to high reducing availability of nearly all plant nutrients especially iron, magnesium, zinc, baron, phosphorus.
Correction of excessively alkaline soils
Use of adequate amounts of acid forming fertilizers e.g. sulphate of ammonia, ammonium nitrate.
Experiment to Complete the Rate of Which Water Moves Through Different soils (Drainage)
Qn 1. Which soil drains fastest and why?
Qn 2. Which soil drains slowest?
Qn 3. Plot a graph of the amount of water drained against time.
THIS VIDEO EXPLAINS HOW TO TEST FOR PH IN SOIL
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