EVPP 108 Lecture Notes - Lecture 5: Methylation, Intercropping, Sodium Hydroxide
21 Aug 2016
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It is the ability to hold and exchange ions. Cation exchange capacity (cec: the content of organic matter and clays is expressed in terms of moles of positive charge absorbed per unit (cmol/kg) Cec is also expressed as milli-equivalent of mono-valent cations that can be exchanged per. Through cation exchange ca, mg, k metals are made available to plants. This, and leaching of metal by h2co3 gives acidity to soil. ion is. It is the residual moisture content after the gravity water has substantially drained out. The minimal point of soil moisture the plant requires not to wilt. If they do not get the required water they die. Available water = field capacity wilting point: since the humus affects cec to a larger extent, they control the fertility of the soil. They occur in large level in plant material. (n, p, k, ca, mg, s) They occur in low level in plant material. (b, cu, fe, mn, mo, zn)
