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p) on the characteristics of photosynthesis, stomata conductance and numbers were read out by spade. For example, sodium and potassium competition and competition between chlorine and nitrate impairs the absorption of nutrients. The result of this reaction is that the plant needs more energy for producing organic matter so it loses most of its energy to resist against salt. This situation of the plant causes a low activity of the root and the growing of the shoot consequently reduce. At this situation the weight and length of the plant reduce too. For example existing potassium in salty lands cause the reduction of sodium in the shoot of the plants. This research was done in a pot with the same amount of salt. Potassium causes the reduction of Toxicity effects of sodium. Research has shown that the potassium in regulating osmotic pressure and permeability of plant cell membranes is effective and cause Increase plant tolerance to salinity.
Conclusion: Some biological indexes of evening primrose plant were negatively affected by increasing rates of NaCl and KCl applications. In salty condition, increasing the amount of sodium causes the reduction of potassium, comparing with sodium. As a matter of fact, this kind of reaction causes the reduction of potassium comparing with sodium. We know that potassium causes a suitable osmotic pressure and reduce the destructive effect of oxidation. So having more potassium than sodium in salty lands is known as the standard resistance. NaCl and KCl compounds should be applied in a precise amount to evening primrose. Otherwise, quantity and quality of evening primrose plant will be decreased.]]>
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