|Better Farming Series 02 - The Plant: the Stem; the Buds; the Leaves (FAO - INADES, 1976, 30 p.)|
|What are leaves for?|
· The leaf feeds the
It receives the raw sap; it changes the raw sap into elaborated sap.
This change is called plant material synthesis.
What is plant material synthesis?
· Heaps of sand, wood and bricks
are not a house.
To build a house you have to put them together.
You join them with cement.
The cement changes the wood, sand and bricks into a house.
· Water and mineral salts cannot
feed the plant.
They have to be put together, they have to be joined.
How are water and mineral salts joined together?
· The leaves live in the
The air contains carbon dioxide gas.
The carbon dioxide gas is made of oxygen and carbon.
The leaf keeps the carbon and gives off oxygen.
· The carbon joins the mineral
sale and the water.
The mineral salts and water are changed into elaborated sap.
The elaborated sap can then feed the plant.
The carbon changes the raw sap into elaborated sap.
This is plant material synthesis.
To join sand, wood and bricks with cement requires work.
You can't have a house without men's work, men's energy.
To join water and mineral salts with carbon also requires work and energy.
· Light gives the leaf this energy.
Light enables the leaf to change raw sap into elaborated
At night there is no light, and the raw sap is not changed.
Light enables the leaf to change raw sap into elaborated sap