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Khazra chelated nano fertilizersapplication as foliar spraying

Foliar sprayingis a supplementary way to decrease fertilizer application. It  is a rather easy and fast efficient method. It is mainly used in the cases of:

  • plant’s immediate need to a special element .
  • low absorbing of the soil elements in early spring due to little roots activity.
  • in the soil conditions that is not appropriate for elements absorption (too high and too low PH level, too high and too low moisture, deficient ventilation etc.).
  • in lime soils with high pH that there is the high probability of some elements deficiency like Iron, Zinc, Manganese, Copper etc.

The competition rises between fruit and roots on nutrient absorption during tree’s reproductive stage. Therefore it is very likely to observe an increase in roots suffering from nutrient deficiency and slow growth. This competition can be reduced by foliage spraying so the results can be prevented.

Different terms influence absorbing rate of applied solution :

  • light
  • temperature
  • relative humidity
  • age of leaves
  • leaves surface
  • plant nutrition condition
  • applied solution pH
  • surfactants

Low light intensity, low temperature and relative humidity cause absorption of applied solution to increase and besides absorption rate enhances if the leaves are younger and their surface is bigger.

It must be mentioned that the weaker is plant in nutrition, the more and faster is elements absorption. Various solutions would reach the maximum absorption in different pH ranges. For instance, the most phosphorus absorption is on the pH 5-6 and the most calcium absorption in on the pH 7. Applying surfactants leads to a reduction in surface tension of water and an increase the contact surface of solution and leaves so helps in more solution absorption consequently.

According to the importance and necessity of the proper application and time of Khazra chelated nano fertilizers to achieve the highest function, the following recommendations should be considered while foliar application:

  • According to the Khazra chelated nano fertilizers capacity of either soil application or foliar spraying, there is no limitation to replacing usage direction, although using each method at least once during growth period would have better effects.
  • Mixing the fertilizers containing calcium with the other fertilizers is not recommended. It would be better if they were applied individually.
  • Do not use any fertilizers on plants in flowering stage as foliar spraying.
  • The best time of foliar spraying is early in the morning before the sunrise due to open pores and high elements absorption rate at this time. Unless foliar spraying is possible at this time, late hours of the day (before it gets dark) will be appropriate.
  • Avoid mixing Khazra chelated nano fertilizers with toxins containing Copper and Sulfur.
  • The foliar spraying ratio is fixed for young trees as 1 gram to 1 liter of water.  but amount of soil application or deep delving will be less.



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