Chemical property of soil
1. Effect of PH on nutrient availability
soil pH is a characteristic that describe the relative acidity or alkalinity of the soil.
The overall nutrient availability is good at close to pH 6.5
Nitrogen potassium and sulphur are major plant nutrients that appears to be.
Growth is promoted with increase percentage of calcium.
2. Cation exchange capacity
Cation exchange capacity is one of the most important soil reaction.
Colloidal soil particles as humans and clay usually bears electronegative charge .
To balance negative charge the particle tends to absorb cation on the surface.
The balancing ions are called exchangeable cations.
The adsorption of a cation by a collide nucleus or micelles and release of an ion is termed as cation exchange.
The major cations are calcium ,magnesium, potassium, sodium.
The efficiency with which iron will replace Each Other is determined by-
a) relative concentration on number of ions
b) number of charges on ion.
c) the speed of movement
The cation exchange capacity is determined in terms of Milli equivalent(m.e) per hundred grams of soil.
Cation exchange capacity= exchangeable H + exchangeable bases.
