[font=Verdana, Arial, Helvetica, sans-serif][size=2]NUTRIENT SOLUTIONS [/size][/font][font=Verdana, Arial, Helvetica, sans-serif][size=2]
Optimum plant growth and yield are the goals, thus watering and nutrition are critical. Optimum nutrient solutions begin with good quality and quantity water. Before starting any commercial operation, the water MUST be analyzed.
The source water should be fairly neutral pH (5-8) with low salt and heavy metal content. Low or high pH can affect nutrient uptake and salt and metals can affect plant growth.[/size][/font] [font=Verdana, Arial, Helvetica, sans-serif][size=2]Optimum plant growth is a function of nutrient concentration in the plant. There is a critical nutrient concentration below which growth is reduced/terminated. The adequate zone is above the critical concentration and provides maximum growth. The toxic zone is above the adequate zone, again resulting in reduced growth or death. [color=#cc0000]THEREFORE, MORE IS NOT ALWAYS BETTER![/color][/size][/font]
[font=Verdana, Arial, Helvetica, sans-serif][size=2]Nutrients are available in several forms, including pre-mixed liquid concentrates, pre-mixed powder concentrates, and "mix your own" varieties. In liquid concentrate form, calcium compounds are mixed separately from phosphates & sulfates since they will form insoluble precipitates and become unavailable to plants.[/size][/font]
http://ag.arizona.edu/ceac/research/archive/nutrition.htm
Intressant:
För höga näringsnivåer kan bli toxiska (vad är för höga nivåer?).
Kalcium ska vara frånskillt fosfat och sulfat annars kan det bli föreningar som kan bli ouptagligt för växterna.
