*2.1.5 Excess of one specific nutrient*

Using in excess a specific nutrient especially N in a cation form, inhibits absorbing others nutrients cations as calcium (Ca), potassium (K), sodium (Na). The nutrient balance is one of the most important factors in plant nutrition [21–23], when plants receive too much N, during a 24 h photosynthesis process, N under forms of nitrate (NO3) or ammonium (NH4), is not transformed into proteins and became attractive for insects [24]. Excesses of N develop elongation, delay maturity, change biochemistry, cause plant stress and make plants vulnerable to drought [25].
