Nitrogen deficiency in legumes
- Name of the disease
Nitrogen deficiency in legumes
- The scientific name
Nitrogen deficiency
- Type of disease Family of disease
Type: non-vital
Disease family: Physiological diseases
- Symptoms of nitrogen deficiency
Symptoms first develop on older leaves and gradually move to younger leaves. In mild cases, old leaves turn pale green. If the problem is not overcome over time, yellowing spreads on the leaves along with a bright red discoloration of the veins and petioles.
As the period of element deficiency progresses, these leaves eventually turn yellowish-white (including the veins), and may curl or grow deformed. The young leaves remain pale green but grow much smaller than normal.
The plants take a thin, linear shape due to weak branching, but their length is usually normal. Plants become more susceptible to water stress, and leaf wilting is common.
Premature death of leaves may occur as they fall, leading to a significant reduction in yield. Plants recover after nitrogen fertilization within a few days.
- Causes of nitrogen deficiency
Nitrogen is considered one of the nutrients most susceptible to loss by leaching from the soil, especially in areas where there is a lot of rain. It is lost very quickly in the form of nitrates due to their easy dissolution in water, as they are lost with irrigation water. As for ammonium, it absorbs onto the surface of soil particles that carry negative charges, and thus resists loss by leaching. However, over time and by the action of microorganisms, soil nitrogen is transformed from the ammonium form to the nitrate form. It is also subject to loss by leaching, and the speed of this transformation increases with high temperature, high ground humidity, and ventilation.
- Suitable conditions for the spread of nitrogen deficiency
Excessive irrigation and heavy rain cause nitrogen deficiency due to over-watering. A lack of soil moisture hinders the absorption of water-soluble nutrients by plant roots.
- Photos of the disease at its beginning and after its spread, in high quality, at least 5 photos in high quality
- Losses of disease spread
This element is considered one of the main necessary elements for plant growth, as the plant needs it in large quantities and has a major impact on increasing production of various agricultural crops. A deficiency of this element leads to a decrease in the crop and its poor quality. The amounts of nitrogen present in the soil vary depending on the quality of the soil, the nature of its composition, and the degree of its fertility, as it reaches The percentage of total nitrogen in the soil reaches 1% or more in some types of soil rich in organic matter, while it decreases a lot and is about 0.5 % or less in some types of poor, infertile soil, such as the soil of desert areas.
- Control strategy
- Chemical fertilizer
- Organic fertilizer
- Fertilizer recommendations
The deficiency is treated by adding available nitrogen fertilizers, which are urea 46%, nitrogen 26%, and ammonium nitrate 30%.
- Anti-membership recommendations
Fermented organic fertilizer
All references and their links must be mentioned
https://docplayer.net/54815593-Lmrshd-fy-mjl-wqy@-lhmdyt-w’%60rd-nqs-%60nsr-ltsmyd.html
https://www.aoad.org/Guidelines_Lack_nutrients_tree%20leaves_fruits_2023.pdf
English 
Arabic