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TMI BlogClassification of Micronutrients, Multi-micro nutrients, Plant Growth Regulators and FertilizersX X X X Extracts X X X X X X X X Extracts X X X X ..... Tariff and explanatory notes of HSN, nature, usage and classification of micronutrients, multi-micronutrients, plant growth regulators and fertilizers is explained in the following paragraphs. 2.1 Micronutrients are essential nutrients that are required in small quantities for the normal growth and development of plants. As on today, iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B), molybdenum (Mo), nickel (Ni) and chlorine (Cl) are included in this category. These elements are also called minor or trace elements, but this does not mean that they are less important than macronutrients. Reply received from IARI on the subject, enclosed with the circular, may please be referred for further details. Inputs received from the trade indicates that these micronutrients are sold in the market as `micronutrient fertilizer' supplying one or more of the eight essential nutrients listed above, namely iron to chlorine. However, in the trade parlance sale of micronutrients as 'micronutrient fertilizers' would not lead to classification thereof under chapter 31 as fertilizers for the purposes of Central Excise Tariff. For classification under chapter 31 , at least one of ..... X X X X Extracts X X X X X X X X Extracts X X X X ..... ed under CETH 3808. More specifically, Gibberellic acid and Plant Growth regulators are respectively covered under tariff item 3808 9330 and 3808 9340. 4. Fertilizers are classified under chapter 31 of the Central Excise Tariff and for this purpose they may interalia be minerals or chemical fertilizers nitrogenous (CETH 3102), phosphatic (CETH 3103), potassic (CETH 3104) or fertilizers consisting of two or three of the fertilizing elements namely nitrogen, phosphorous and potassium; other fertilizers (CETH 3105). For the purpose of classification of any product as "other fertilizers", chapter note 6 of Chapter 31 is relevant which provides that the term "other fertilizers" applies only to products of a kind used as fertilizers and contain, as an essential constituent, at least one of the elements nitrogen, phosphorus or potassium. It is quite clear that for any product to merit classification under CETH3105 as other fertilizers, the product must have nitrogen or phosphorus or potassium or their combination as an essential constituent providing the essential character to the product. The chemical elements - nitrogen, phosphorus and potassium are also referred as ..... X X X X Extracts X X X X X X X X Extracts X X X X ..... luded in this category. The concentration of these nutrients in plants is found often within 100 mg kg-I (on dry weight basis). except Fe and Mn, which can go normally up to about 500 mg kg-1. These elements are also known as minor or trace elements, but this does not mean that they are less important than macronutrients. Functions Iron * Iron is a constituent of two groups of proteins, viz. (a) Herne proteins containing Fe porphyrin complex as a prosthetic group: Cytochromeoxidase, catalase, peroxidase, leghemoglobin.and (b)Fe-Sproteinsin whichFeis coordinated to the thiol group of cysteine or to inorganic S: Ferrodoxin * It activates a number of enzymes, including aminolevolinic acid synthetase and coproporphyrinogen oxidase. * It plays an essential role in the nucleic acid metabolism. * It is necessary for synthesis and maintenance of chlorophyll in plants. Manganese * Manganese is an integral component of the water-splitting enzyme associated with photosystem II. Because of this role. Mn-deficiency is associated with adverse effects on photosynthesis and O2 evolution. * It is a constituent of superoxide dismutase (Mn-SOD). Role of Mn assumes criticality becaus ..... X X X X Extracts X X X X X X X X Extracts X X X X ..... ful effects of drought. * Boron plays a role in pollen germination and pollen tube growth. * It facilitates ion uptake by way of increasing the activities of plasma-membrane bound H+-ATPase (H+-adenosine triphosphatase). * It facilitates transport of K in guard cells as well as stomatal opening. Nickel * Nickel is associated with nitrogen metabolism by way of influencing urease activity. In systems where urea is used as the sole N fertilizer for foliar spray and Ni supply is poor. lower urease activity causes urea toxicity to the foliage and leads to severe necrosis of the root tips. * In free-living Rhizobia, adequate Ni supply ensures optimum hydrogenase activity. * It facilitates transport of nutrients to the seeds or grains. Chlorine * It plays a major role in osmoregulation (cell elongation, stomatal opening) and charge compensation in higher plants. * It acts as a co factor in Mn-containing water splitting enzyme of photosystem II. * Chlorine in abundance suppresses the plant diseases, viz. grey leaf spot in coconut palms, take-all and common root rot in wheat, common root rot and Fusarium root rot in barley, stalk rot in corn, stem rot and sheath blight ..... X X X X Extracts X X X X X X X X Extracts X X X X ..... ators naturally found. Kindly also give examples of Plant Growth Regulators and Plant Growth Harmones which are produced industrially and sold in the market, Micro Nutrients Iron (Fe), manganese (Mn), zinc (Zn), copper (Cu), boron (B), molybdenum (Mo), nickel (Ni) and chlorine (Cl) are classified as plant micronutrients. Plant Growth Regulators Naturally Found: * The plant hormones are identified as promoters(auxins. gibberellin and cytokinin),inhibitors(abscissic acid and ethylene) and other hypothetical growth substance(florigen, lfowering hormone, etc.,) * More recently discovered natural growth substances that have phytohonnonal-like regulatory roles (polyamines, oligosaccharins, salicylates, jasmonates; sterols, brassinosteroids, dehydrodiconiferyl alcohol glucosides, turgorins,systemin.unrelated natural stimulators and inhibitors), as well as myoinositol. Plant Growth Regulators which are produced industrially are listed in Table 1. v) Are Micro-nutrients and Plant Growth Regulators (PGRs) one and the same? These are different Table 1: LIST OF MARKETED PLANT GROWTH REGULANTS WITH ACTIVE INGREDIENTS Active ingredient/Formulation/Concentrate Product Name Compa ..... X X X X Extracts X X X X X X X X Extracts X X X X
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