Class: Nutritional Disorders
Nitrogen (N) deficiency
Nitrogen is a macronutrient that all plants need and is a key component in many important organic compounds such as amino acids, nucleic acids, and proteins.
Nitrogen uptake in plants occurs in the form of NO3− (ammonium nitrate), NH4+ from the soil, or N2 from the atmosphere with the aid of nitrogen-fixing bacteria.
All in all, the total content of nitrogen varies from 2 to 4% in dry plant matter.
The main symptom is leaf chlorosis. Individual leaves will become pale and yellow. In cereals, yellow discoloration from the leaf tip creates a “V” shape.
The exact amounts, timing, and methods for fertilizers applications vary regarding the specific crops, type of soil, phase of the growth, and means of implementation.
Some nitrogen-based fertilizers
Urea, ammonium nitrate, calcium ammonium nitrate are common nitrogen-based fertilizers being used.
In general, plant nutrient availability depends on several processes in the soil–plant system. In order for a specific nutrient to be absorbed and utilized, some conditions have to be met.
Methods of correcting nutrient deficiencies vary according to agro-climatic regions and the magnitude of the disorder.
Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides and Herbicides). It is the grower’s sole responsibility to keep track after the legal uses and permissions with respect to the laws in their country and destination markets. Always read the Instructions written on the label and in any case of contradiction work with accordance to the product label. Keep in mind that information written on the label usually apply only to local markets. Pests control products intended for organic farming are generally considered to be less effective in comparison to conventional product. And so one must keep in mind that when dealing with organic, biologic and, to some extent, small number of conventional chemical products, a complete eradication of a pest or a disease will often require several iterations of a specific treatment or combination of treatments.