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admin | Bodybuilding Training Program | 13.10.2015
Symptoms of deficiency can vary across crop species, but similarities exist for how nutrient insufficiency impacts plant tissue color and appearance.
All photos are provided courtesy of the International Plant Nutrition Institute (IPNI) and its IPNI Crop Nutrient Deficiency Image Collection.
One of three primary nutrients, phosphorus (P) is essential for plant growth, and a plant must access it to complete its normal production cycle. Potassium (K) is one of the essential nutrients and is taken up in significant amounts by crops. Hidden in the heart of each chlorophyll molecule is an atom of magnesium (Mg), making the nutrient actively involved in photosynthesis.
Magnesium nutrition of plants is frequently overlooked and shortages will adversely impact plant growth. Magnesium is an essential component of chlorophyll, with each molecule containing 6.7 percent Mg. Magnesium is mobile within the plant and easily translocates from older to younger tissues. The secondary nutrients, calcium (Ca), magnesium (Mg) and sulfur (S), are as important to plant nutrition as the primary nutrients.
When Ca translocates within the plant, it improves plant roots' ability to absorb other nutrients.


Crops vary widely in their need for B, and the line between deficient and toxic amounts is narrower than for any other essential nutrient. Manganese deficiencies are often associated with high-pH soils, which may result from an imbalance with other nutrients such as Ca, magnesium (Mg) and Iron (Fe).
Hydrogen (H), derived almost entirely from water, is one of the 17 essential nutrients necessary for plant growth.
All crops must have an adequate supply of each of these 17 nutrients to produce optimum yields. Potassium is vital to photosynthesis, protein synthesis and many other functions in plants.
Magnesium also aids in phosphate metabolism, plant respiration and the activation of many enzyme systems. Unlike the other secondary nutrients like calcium and magnesium (which plants take up as cations), S is absorbed primarily as the SO42- anion.
Nitrogen-deficiency symptoms are more severe on older leaves, however, because N is a mobile plant nutrient and moves to new growth. Deficiency in secondary nutrients, including Ca, can depress plant growth as much as primary nutrient deficiencies do.
This changeover is essential for microorganisms because they turn crop residues into organic matter, release nutrients, and improve soil aggregation and water-holding capacity.


Interestingly, while higher plants require B, animals, fungi and microorganisms do not need this nutrient. In accordance with The Law of the Minimum, if one or more nutrients are lacking in the soil, crop yields will be reduced, even though an adequate amount of other elements is available.
Classified as a micronutrient, only a small amount of this essential nutrient is needed for plant survival. Crop yields may be limited by the element that is in shortest supply, so it helps to understand the key nutrients that are needed to make your crop thrive.
Since Mo becomes more available with increasing pH, liming will correct a deficiency if soil contains enough of the nutrient.
The percentage of the total amount of each nutrient taken up is higher for P late in the growing season than for either N or K. However, seed treatment is the most common way of correcting Mo deficiency because only very small amounts of the nutrient are required.



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