Introduction This glossary was originally produced by Continuing Education, CB Alexander Agricultural College, ‘Tocal.’ This edition was compiled with contributions from staff of NSW Department of Primary Industries including: David Brouwer, Mary Kovac, Angela Thompson, Amanda Paul and Glenda Briggs www.tocal.nsw.edu.au Agdex 810 National Library of Australia Card Number ISBN: First Edition 1994 Second Edition 1999 © 2012 NSW Department of Primary Industries This publication is copyright. Except as permitted under the Copyright Act 1968 (Cth), no part of this publication may be produced by any process, electronic or otherwise, without the speci"c written permission of the copyright owner. Neither may information be stored electronically in any form whatever without such permission. 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Recognising that some of the information is provided by third parties, the State of New South Wales, the author and the publisher take no responsibility for the accuracy, currency, reliability and correctness of any information included in the document provided by third parties. aA .....................................................................................................................6 bB ...................................................................................................................12 cC ...................................................................................................................22 dD ..................................................................................................................34 eE ...................................................................................................................40 fF .....................................................................................................................45 gG ..................................................................................................................51 hH ..................................................................................................................55 iI ......................................................................................................................61 jJ .....................................................................................................................64 kK ...................................................................................................................65 lL .....................................................................................................................66 mM ................................................................................................................71 nN ..................................................................................................................78 oO ..................................................................................................................81 pP ...................................................................................................................84 qQ ..................................................................................................................93 rR ....................................................................................................................94 sS .................................................................................................................100 tT ..................................................................................................................116 uU ................................................................................................................122 vV ................................................................................................................123 wW ..............................................................................................................126 xX ................................................................................................................130 yY .................................................................................................................131 zZ .................................................................................................................132 aA absorption Movement or transport of dissolved compound or solution into cells. ABV Australian breeding value. acidi"cation The process of making more acid. In soils, this is usually brought about by pasture improvement involving the use of fertilisers (especially nitrogen) and legumes over a long period of time. acid rain Rain which contains a relatively high concentration of sulfuric acid brought about by the discharge of sulfur products into the atmosphere. Acid rain can be damaging to plant growth and lower soil pH over the long term. acid soil A soil with a pH less than 7, but in practice, 6.6 or less. There are more hydrogen ions than hydroxyl ions in an acid soil. The growth of crop plants may be reduced in high acid soils. acid sulfate soil The common name given to naturally occurring soil and sediment containing iron sul"des, mainly the mineral iron pyrite. When sul"des are exposed to air, oxidation takes place and sulfuric acid is produced. actinomycetes A type of bacteria that gives soil an earthy smell. acute toxicity A rapid adverse effect caused by a substance taken or absorbed by a living organism. adaptation Modifying a place to suit a particular use; or, changing behaviour to meet certain changed conditions. adhesive Glue ad lib At will. In agriculture, the unrestricted intake of feed. Animals can eat at will. adsorption The way in which nutrient cations are attracted and attached to the surface of clay and organic particles in the soil. ad valorem Charges on documents or goods are sometimes calculated according to the value of the goods. For example, stamp duty on documents and customs duty on some goods. (Origin: Latin - according to value) aerobic Soil or water conditions in which free oxygen is plentiful. aesthetic Relating to visual appearance rather than physical or technical aspects. aged Animals (usually sheep) that are past the most economic period of production. aggregate Groups of soil particles that are clumped together to form the structure of the soil agistment Leasing the grazing rights to a paddock. agroforestry Combining the operations of agriculture (cropping, grazing) with growing trees for sale or farm use. agronomy The study of land management involving a knowledge of crops and pastures, climate, soils and fertilisers. AI See Arti"cial insemination algae Various forms of primitive, microscopic water plants. Blue-green algae can multiply rapidly as nutrient levels rise, and can become toxic to animals and humans. alkaline soil A soil with a pH of greater than about 7.0, or a high sodium content, or both. The growth of crop plants may be reduced in highly alkaline soils. allelopathic compounds Chemicals synthesised by plants and microbial #ora to inhibit growth of the same or other species growing in the vicinity. alluvial soil Soils formed from sediments deposited on land by streams. amino acid The basic chemical unit that composes protein. ammonium Negatively charged mineral form of nitrogen. anabranch The branch of a river or stream that has become cut off from the main channel and may enter it again further on. anaerobic • Not requiring free or bound oxygen • Occurring in the absence of free or bound oxygen. angiosperm A #owering plant. anion A negatively charged ion such as Carbonate which forms part of