By Konrad Mengel, Ernest A. Kirkby, Harald Kosegarten, Thomas Appel
This is the fifth version of a well-established publication Principles ofPlant Nutrition which used to be first released in 1978. an identical structure is maintained as in earlier versions with the first goal of the authors to contemplate significant approaches in soils and vegetation which are of relevance to plant nutrition.This re-creation offers an updated account of the clinical advances of the topic via making connection with approximately 2000 guides. a good function of the publication, which distinguishes it from others, is its broad strategy encompassing not just easy nutrients and body structure, but in addition sensible features of plant food regarding fertilizer utilization and crop construction of direct value to human food. spotting the overseas readership of the ebook, the authors, as in prior variants, have tried to put in writing in a transparent concise form of English for the advantage of the numerous readers for whom English isn't their mom tongue. The publication should be of use to undergraduates and postgraduates in Agriculture, Horticulture, Forestry and Ecology in addition to these studying in Plant Nutrition.
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Example text
Generally the centre of the octahedron is occup ied by AP+ although it can be repla ced by Mg2+ and Fe 2+. Sometimes the central atom may be absent. 8 Soil texture and important soil minerals in the sand, silt,and clay fraction (Schroeder 1984). 9 Tetrahedr on and octahedro n as structural elements of phyllosilicates. The layer silicates carry a negativ e charge which enable them to adsorb cations. Both a variable and a permanent negat ive charge are present. The variable charge originates from H+ dissoci ation of OH- groups and is therefore pH dependent, bein g 31 high at high pH and vice versa .
Soil structure also depends on the vegetative cover. Under permanent grass land in particular, very good soil struc tures occur. This resu lts from the effect of the high organic matter content and soil fauna. In this respect the earthworm contribu tes considerably to the formation of stable aggregates. Arab le soils are ofte n lower in orga nic matter and soil fauna and for this reason often are poorer in soil structure. 4 Soil water The availability of water to plants depends generally on two major soil factors .
These soils have a high clay concentration consisting almost exclusively of smectites. In the wet season they swell and become sticky whereas in the dry season they dry out to such an extent that they tum rock hard and crack. 1). Shape and particle size depend to a large extent on the type of clay minerals present in the soil. Smectite clays tend to produce prismatic angular structures whereas kaolinite and hydrous oxides are associated with more granular aggregates. / Shtinking and cracking of a black cotton soil in India (Photo: Mengel).