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6.5.4 Tabulated Data on Magnesium Contents in Soils 6.6.1 Kinds of 6.6.2 Effects of Fertilizers on Plant Growth 6.6.3 Application of Fertilizers 6.1 HISTORICAL INFORMATION 6.1.1 Determination of Essentiality The word 'magnesium' is derived from 'magnesia' for the Magnesia district in Greece where talc (magnesium stone) was first mined (1,2). However, there are other cities that are also named after the magnesium deposits in local regions (3). In 1808, Sir Humphry Davy discovered magnesium, but...

References

The essentiality of certain elements in minute quantity for plants with special reference to copper. Plant Physiol. 14 371-375, 1939. 2. H. Marschner. Mineral Nutrition of Higher Plants, 2nd ed. London Academic Press, 1995, p. 889. 3. E. Epstein, A.J. Bloom. Mineral Nutrition of Plants Principles and Perspectives, 2nd ed. Sunderland, Mass. Sinauer, 2005, p. 400. 4. J.B. Jones, Jr. Hydroponics. A Practical Guide for the Soilless Grower. Boca Raton, Fla. St. Lucie, 2000,...

Plant Mechanisms Of Aluminum Avoidance Or Tolerance

There are two types of mechanisms whereby a plant can avoid or tolerate aluminum toxicity (a) exclusion of aluminum from the symplasm, or (b) internal tolerance of aluminum in the sym-plasm. Good reviews on this subject are in Taylor (186,187), Matsumoto (99), Kochian et al. (179, 188), and Barcelo and Poschenrieder (96). 16.8.1 Plant Mechanisms of Aluminum Avoidance Based on chemical analysis of aluminum in root sections, Horst et al. (189) showed that the root tips of an aluminum-tolerant...

Fertilizers For Chlorine

Chlorine is added to soil from a wide variety of sources that include chloride from rainwater, irrigation waters, animal manures, plant residues, fertilizers, and some crop protection chemicals. The amount of chloride deposited annually from the atmosphere varies from 18 to 36 kg1 ha1 year1 for continental areas to more than 100 kg1 ha1 year1 for coastal areas (4). Most of the chloride applied as animal manures or plant residues is soluble and readily available for crop uptake. Because most of...

Physical And Chemical Properties Of Nickel And Its Role In Animal And Bacterial Systems

Nickel is a first-row transition metal with chemical and physical characteristics ideally suited to biological activity (18). Divalent nickel is the only oxidation state of nickel that is likely to be of any importance to higher plants. Nevertheless, Ni2+ forms a bewildering array of complexes with a variety of coordination numbers and geometries (19). Nickel readily binds, complexes, and chelates a number of substances of biological interest and is ubiquitous in all biological systems. Nickel...

Molybdenum Fertilizers

Several molybdenum sources can be used to prevent or alleviate molybdenum deficiency in crop plants (Table 13.4). These sources vary considerably in their solubility and in molybdenum content, and their effectiveness often depends primarily on the method of application, plant requirements, and on various soil factors (87). The relative solubilities of some molybdenum fertilizers are as follows sodium molyb-date > ammonium molybdate > molybdic acid > molybdenum trioxide > molybdenum...

Table 111

Fe Deficiency Chlorosis-Inducing Factors That Are Often Observed, and Synonyms for These Chlorosis Symptoms Lime-induced chlorosis Bicarbonate-induced chlorosis High ethylene concentration Ethylene-induced chlorosis High soil compaction High heavy metal content Management factors Soil compaction High P fertilization High application of Cu-containing fungicides Inadequate assimilate delivery and late vintage (harvest) Plant factors Low root growth High shoot root dry matter ratio Low Fe...

Copper Toxicity In Plants

Prior to the identification of copper as a micronutrient, it was regarded as a plant poison 7 . Therefore, no discussion of copper toxicity can rightfully begin without mention of its use as a fungicide. In 1882, botanist Pierre-Marie-Alexis Millardet developed a copper-based formulation that saved the disease-ravaged French wine industry 68 . Millardet's observation of the prophylactic effects against downy mildew of grapes by a copper sulfate-lime mixture led to the discovery and development...