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The disease of nutritional deficiency on crops – How to effectively add fertilizer?

Poor growth, slow growth or many other problems are not caused by pests or insects, sometimes because the plant does not have enough nutrients. The disease of undernutrition on crops is often manifested as an abnormal change in leaf shape and color. So how to know that the tree is lacking any nutritional element, let’s find out with Agri!

Inspect plants when detecting abnormal symptoms

When seeing unusual phenomena on plants, it is necessary to determine whether the tree is being attacked by insects, pests or due to nutritional problems. Examples of manifestations on popular crops:

Pests and diseases of roses

Pests and diseases on orchids

Types of indoor plant pests

Unsuitable weather and environment (wet soil with poor drainage, unfavorable weather, ..) slows down plant growth, underdeveloped root system and also affects flowering and fruiting of plants. tree.

Too much fertilizer can lead to fertilizer poisoning. Plants seem to scorch, wilt and yellow the whole plant quickly, even when the soil is wet. After 1-2 days after fertilizing, the plant appears this condition is a sign of over fertilizing the plant.

Undernutrition in plants is expressed differently depending on which nutrients the plant is lacking.

Nutrients that plants need for growth and development

Plants require a mixture of nutrients (macro, intermediate and micronutrients) to stay healthy and grow well.

  • Macronutrients: Nutrients needed by plants in relatively large quantities are called macronutrients. The macronutrients for plants include: nitrogen (N), potassium (K) and phosphorus (P).
  • Intermediate nutrition: A group of nutrients that plants need in moderation. Intermediate nutrients include: calcium (Ca), sulfur (S) and magnesium (Mg).
  • Micronutrients: are nutrients necessary for plant growth but in much smaller amounts. These micronutrients include: boron, copper, iron, manganese, molybdenum and zinc.

To supplement multi-, medium-, and micro-nutrients, especially Humic with composted cow dung To foster and improve soil fertility, you can refer to more types: OCT Tropical premium microbially composted Australian cow dung

How do plants get nutrients?

All nutrients are taken through the roots. Water transfers nutrients from the soil to plant roots. Therefore, a requirement of adequate plant nutrition is water.

The second requirement is the proper pH for the plant to be grown. Each plant prefers a specific pH range to be able to absorb nutrients. If the pH is too acidic or alkaline for that variety, the plant will not be able to take in nutrients no matter how rich the nutrients may be. When plants do not adapt, tolerance leads to poor growth and death.

Manifestations of nutritional deficiencies in plants

With each different substance, the missing plants have different manifestations, typically as follows:

Lack of macronutrients – Manifestations of nutritional deficiency disease on plants

Protein deficiency:

OLDPoor growth. Young leaves are pale green and thinner, while older leaves turn yellow and fall prematurely. When there is a lack of nitrogen, the leaf size becomes smaller.

Nitrogen (N) needs to be provided in large amounts because nitrogen is needed in all plant growth processes, the main constituent of plant protein and chlorophyll. Plants carry out photosynthesis by using chlorophyll to produce sugars and oxygen. Therefore, when there is a lack of nitrogen, the leaves will be yellow due to the lack of chlorophyll, and at the same time, the growth will be slowed down, causing slow growth, poor development, and no new growth (young shoots, young leaves, etc.). .)

Source of Nitrogen for plants

The main protein sources are ammonia sulphate, urea, calcium nitrate, calcium ammonium nitrate, sodium nitrate, potassium nitrate, ammonium phosphate. Protein sources can be added fertilizer through feed ingredients to feed livestock such as VO6 grass, baby corn, etc.

Lack of phosphorus:

The small leaves may be purple-red, initially appearing in part of the leaf, usually at the tip, and may burn. Then the leaves spread and fall, and the old leaves become almost black. Fruit yield decreased.

Like Nitrogen, Phosphorus is also involved in plant development, and is a component of the cell nucleus. Phosphorus is essential for plant root growth and seed germination. The difference between N and P is that P affects the maturation of the plant, the formation and ripening of the fruit, while N strongly affects the nutritional organs (including roots, stems, and leaves).

In fact, adding P can prevent excessive growth in the nutrient organs due to excess N. P deficiency stops growing or growth is weak but leaves are still greener than yellow. Phosphorus-deficient roses often appear dark purple streaks under the leaves, causing the leaves to fall prematurely, then the plant will be weak and stop growing. Cabbage and broccoli that lack phosphorus often have purple spots on the leaves.

It should be noted that this phenomenon may be due to other causes such as the effects of cold weather, but not entirely due to phosphorus deficiency. Phosphorus deficiency symptoms can be overcome by applying about a fistful of superphosphate/m2 of garden area. Superphosphate is the most widely used form of phosphorus.

Source of phosphorus for plants

Completely water-soluble forms of phosphorus include mono-ammonium phosphate, di-ammonium phosphate, and potassium phosphate. Bone meal provide phosphorus, but it is a slow-soluble form of phosphorus. Poultry manure contains a reasonable amount of phosphorus.

Potassium (K) Deficiency:

Usually manifests on older leaves. On the leaves will appear scorching streaks starting from the tip of the leaf and along the edges of the leaf (the edge of the leaf becomes brown and shriveled). Besides, the tree has weak roots, weak branches that are easy to break, dry out and die if lacking a lot. Lack of K during fruiting will cause fruit to drop a lot and lose yield.

Potassium affects the control of water in the transpiration process of plants, acts as a catalyst in the processes of forming or storing starch, protein, etc. When K deficiency occurs, the above symptoms will lead to The chain effect is that the plant cannot absorb enough water to compensate for the loss of transpiration through the leaves causing loss of control.

Source of potassium for plants

The commercial source of potassium used to supply plants is mainly KCl. Because of the high K content and low cost. However, in areas with high chlorine content, KCl can easily lead to chlorine poisoning. This phenomenon is sometimes clearly seen in roses and some vegetables when high amounts of KCl are used. Using Potassium Sulphate does not lead to this phenomenon. Potassium nitrate is a very good source of K and has the advantages of providing soluble N at the same time.

The natural form of potassium is found in organic humus, cow manure, goat dunghorse, buffalo, sheep and especially poultry manure, but these materials should not be left in the rain for too long because K can be easily washed away.

If the soil is very acidic, K can become insoluble form that cannot be absorbed by plants, which can lead to K deficiency. This can be overcome by adding lime to increase K easily. melt. It should be noted that K is easily soluble and easily washed away during periods of heavy rain and flooding, so in tropical areas with high rainfall, people often apply a lot of K.

Learn more: Organic Humic Banana Juice with twice the potassium content and brewed under special probiotics

Deficiency of intermediate elements – Manifestations of nutritional deficiencies in plants

Deficiency of Sulfur (S): It is usually expressed in the young leaves at the tip of the branches, the tips of the tips and in the young shoots. Young leaves lose their green color and turn bright yellow or greenish white. Thin leaves, veins and leaf blades all lose color. Leaf margins are twisted, bent and easily torn from the edge.

Lack of Calcium (Ca): usually present in mature leaves. Leaves turn yellow from edge to center. Leaves only have an area of ​​dark green leaves along the sides of the main veins. Sometimes, the leaves are yellowed not according to the original but into uneven streaks that appear scattered on the leaves.

Magnesium (Mg) Deficiency: Symptoms will appear on mature leaves first. Olive yellow streaks appear along the main and lateral veins of the leaves. Lacking a lot of Mg, these yellow streaks turn brass, the main and secondary veins have a prominent green color on the background of yellow leaves like herringbone.

Lack of trace elements – Manifestations of nutritional deficiency disease on plants

Zinc (Zn) Deficiency:
Weighing nutritional deficiency disease on crops
Expression of Zn deficiency in plants

Signs appear on young leaves at the tips of stems and branches. Leaves are smaller than normal size, curled and deformed. When Zn is deficient, chlorophyll in leaves is partially lost, causing leaves to appear bright yellow along the main veins or on the entire leaf.

Overcome symptoms of Zn deficiency by applying zinc sulphate to the soil.

Boron deficiency (B):
Bo-deficient plant expression

In the absence of Bo, shoots or shoots gradually atrophy and die. Young leaves or apical buds are deformed and curled, elongated, and thickened. Besides, the stem and roots are underdeveloped.

Correct symptoms of B deficiency by adding sodium borate or borax but use with care because although borax can be a regulator and facilitator of N absorption, it can become an herbicide if accumulated. condenser is too large.

For medium-sized lemon trees, no more than 1 tablespoon of borax should be used, this amount of borax should be dissolved with water and watered into the foliage area. Do this once every 12 months

Lack of Copper (Cu):
Disease of lack of nutrients on trees
Expression of copper (Cu) deficient plants

Growth slowed down. Leaves may curl or fall. The trunk is also curved and drooping. t=Copper deficiency leads to the death of young roots, sometimes burning of the leaf cover along with the phenomenon of creating many sprouts but not strong, the phenomenon of secretion of sap, leaking latex also occurs.

Remedy by applying copper sulphate or spraying copper oxychloride.

Manganese deficiency (Mn):

Symptoms of manganese deficiency, which often look like iron deficiency, appear as middle chlorosis (yellow leaves with green veins) on young leaves, and sometimes dissolving, sunken spots appear in chloric areas between veins. Plant growth may also be reduced and stunted.

Manganese deficiency can occur when the pH of the growing medium exceeds 6.5, as it is bound and unavailable for absorption. Deficiencies can also occur due to low fertilization rates, use of conventional fertilizers (which often reduce micronutrient content), excessive leaching, or excessive application of iron chelate impregnation.

Carrying out acidification of the soil will improve the condition or use soluble manganese sulphate to fertilize the soil

Deficiency of Molybdenum (Mo):

Older leaves are yellow, remaining foliage turns light green. Leaves may become narrow and deformed. Lack of Mo leaves twisted and fallen stalks. During the seedling stage, the leaves of broccoli and cabbage roll inward with small spots. Shrubs lacking Mo will often die young roots.

When the soil is too acidic (high acidity, low pH) it will prevent plants from absorbing Mo or when applying fertilizers with high N and P content.

Overcome Mo deficiency by spraying sodium molybdate at a dosage of 1 tablespoon dissolved in 4.5 liters of water

Zinc (Zn) Deficiency: Yellow color between new growth veins. The terminal leaves may form a flower. Symptoms of Zn deficiency sometimes occur in citrus trees causing yellow spots on leaves. Zn deficiency symptoms can be overcome by applying zinc sulphate to the soil.

Overcome symptoms of Zn deficiency by applying zinc sulphate to the soil.

In fact, plants often lack more than one substance and include both intermediate and trace elements. These elements will be easily absorbed through liquid fertilizers, which will complement plants that lack intermediate micronutrients such as: micro-fertilizer EDTA, S-Amin nutrition

Add fertilizer effectively to reduce the disease of nutrient deficiency for plants

Above are some symptoms of malnutrition observed and summarized. Diagnosing undernutrition is difficult and complicated because of the fact that the plant may be deficient in more than one element or may have a deficiency of an element and the presence of a toxic element. It is also possible that the soil contains all the nutrients the plant needs, but the plants cannot absorb them because they are insoluble because the soil is too acidic or too alkaline or too much of another element.

However, do not worry too much about the symptoms of malnutrition. And take care not to use excessive or unnecessary amounts of manure. Sometimes the plant shows no growth just because it is in its resting stage, or because of the physical factors of the soil, too much or too little water. Sometimes the tree is in a state of root damage due to too much fertilizer in the soil.

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Emilia Chaney
Emilia Chaney
My name is Emilia Chaney. I'm a social girl from Romania with a big smile and 3 passions: Agriculture, Travel and Social Media. I try to make this blog practical, full of great advice and inspiring ideas.

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