Through the roots, plants absorb water and minerals as nitrogen, potassium, phosphorus, calcium, iron...This watery substance called gross SAP, amounts by Woody vessels to the leaves. Chlorophyll produced by chloroplasts, leaf capture light energy and carry out photosynthesis, which take carbon dioxide from the air, emit oxygen and transform the raw SAP in elaborate SAP with glucose, food that is distributed throughout the plant through the Liberian vessels. This process is similar to the human bloodstream. In some parts of Spain, at the beginning of the spring, are pruned vines, quite a few drops of water to segregate in the Court: is the gross SAP is rising.