Water In Relation To Soils And Plants

Water In Relation To Soils And Plants
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Water In Relation To Soils And Plants

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Publisher: Agrobios Publications
ISBN: 9788177540918
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PREFACE There are some good books published in the past abroad on the subject of soil, water and plant relations. The subject has also been covered by many authors as part of books on soil science, agronomy and irrigation. However, most of these books focus on physical and physiological relations of water with soils and plants, in general, as processes. In variance with it, in the present book emphasis has been given on analysing these processes in relation to growth of crop plants in variable agricultural systems adopted in India and like countries. This was somehow not much emphasised in the past. Also, the elements of weather as they affect water relation with soil and plants and, in turn, influence crop performance, are highlighted in the present write-up. Besides, in view of the volumes of added research on soil-water-plant relations reported from different countries it was considered the need of the time to update the information through this book. Lastly, an attempt has been made here to present the subject in the form of a text, with ample clarifications of direct and associated terms used, support with sufficient examples from dry farming and irrigated agriculture systems prevalent in India, so as to meet the course requirements of postgraduate students of agronomy and soil science in India and like countries. O.P.G.
CONTENTS Chapter-1 MOLECULAR CHARACTERISTICS, PROPERTIES AND FUNCTIONS OF WATER IN PLANTS AND SOILS ........................................................................ 1 1.1 Molecular Characteristics of Water ............................................. 1 1.2 Important Properties of Water ..................................................... 4 1.2.1 Specific heat ..................................................................... 4 1.2.2 Heat of vaporization ......................................................... 5 1.2.3 Cohesion and surface tension ........................................... 5 1.2.4 Adhesion .......................................................................... 5 1.2.5 Spontaneous transport ...................................................... 6 1.2.6 Water potential w ......................................................... 7 1.2.7 Components of water potentials in soils .......................... 7 1.2.8 Components of water potential in plants cell ............................................................................... 10 1.2.9 Water potentials in air .................................................... 12 1.3 Primary Functions of Water ...................................................... 12 1.3.1 Functions of water in plants ........................................... 12 1.3.2 Functions of water in soils ............................................. 13
Chapter -2 SOIL PORE SPACE SYSTEM AND SOIL MOISTURE CONSTANTS ............................................................. 15 2.1 Soil Pore Space System ............................................................. 15 2.2 Soil Moisture Constants ............................................................ 18 2.2.1 Maximum water holding capacity MWHC ................. 18