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Based on an exhaustive collection of terms from various sources, RiceVocs - A Compendium of Rice related vocabulary has been developed. This document along with Information Architecture is used for tagging purposes to make RKMP a semantic portal.

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Azotobacter

Azotobacter is a genus of usually motile, oval or spherical bacteria that form thick-walled cysts and may produce large quantities of capsular slime. They are aerobic, free-living soil microbes which play an important role in the nitrogen cycle in nature, binding atmospheric nitrogen, that is inaccessible to plants and releasing it in the form of ammonium ions in to the soil.

Azolla

A water fern that fixes nitrogen symbiotically with the blue-green alga anabaena.

Axillary

Arising in an axil.

Axil

The upper angle between a leaf or a branch or a stem from which it arises.

Axenic

Free of all other associated life, said of organisms isolated in soil culture; germ-free.

Awn

A bristle like extension of varying length originating from the lemma of the rice spikelet. Present in some varieties.

Avirulent micro-organism

A plant pathogenic micro-organism which is not capable of producing infection on the host plant avoidance.

Available water

The portion of water held in soil, which may be absorbed into the roots of the plant.

Available nutrient

An element in the soil which can be readily absorbed and assimilated by growing plants.

Auxotroph

An auxotroph is an organism which is not able to synthesize a particular organic compound required for its growth.

Auxins

A group of growth regulators or plant hormones (natural or synthetic) that may stimulate cell growth and induce cell elongation or division; often induce adventitious roots, root development, and other growth processes including seed germination. Auxins have an essential role in coordination of many growth and behavioral processes in the plant life cycle.

Autotroph

A cell or organism that manufactures its own food from co2 and other small inorganic compounds by the process of photosynthesis.

Autosomes

Chromosomes not associated with sex of the bearer.

Autoradiogram

The photographic record of a chromatogram that contains radioactively labeled compounds. Prepared by exposing a sensitive photographic film to the radioactive radiation by placing it in contact with the chromatogram.

Autopolyploid

A polyploid which possesses duplication of the same set of chromosomes, or more than two sets of chromosomes, coming from same species.

Autoinfection

Infection of a host by a microorganism or virus produced within or upon the body of the same host individual.

Autoclave

An airtight chamber that can be filled with steam under pressure or surrounded by another chamber for the steam and that is used for sterilizing, cooking or other purposes requiring moist temperatures above 212 oF or 100 °C . Used for sterilization.

Aus paddy

A photoperiod insensitive, rainfed, drought-prone, lowland, or upland rice, broadcast and transplanted during the early part of the wet season from March to September in Bangladesh and from April to August in East India.

Auricle

1) A pair of small ear-like appendages borne at the base of the leaf blade and usually arising at the sides where the ligule and the base of the collar are joined. 2) An ear-shaped appendage, usually occurring at the junction of the leaf sheath and the blade that may not be present in older leaves.

Auger

1) A tool for boring holes, made up of a long shank with a cutting edge and a screw point. Soil augers are used to obtain samples of soil for analysis. 2) A device on a combine harvester (shaped like a large screw) which carries the grain up into the grain tank.

Attack

To cause growth retardation or an economic yield loss from disease, insect, bird or other pests.

ATP

Adenosine TriPhosphate, a nucleotide consisting of Adenine, ribose sugar, and three phosphate groups; the major source of usable chemical energy in metabolism. On hydrolysis, ATP loses one phosphate to become adenosine diphosphate (ADP), releasing usable energy.

Atmospheric Drought

This drought occurs due to low atmospheric humidity, high wind velocity and high temperature which cause a plant to lose most of its water by transpiration, thus resulting in water deficit situations.

Asymmetrical

Parts not equally or symmetrically arranged.

Assman’s psychrometer

Richard Assmann developed a psychrometer for accurate measurement of atmospheric humidity and temperature. This was the first instrument that was able to provide reliable temperature readings with high altitude balloons, as it was capable of shielding its thermometric elements from solar radiation.

Assimilation

1) The utilization of inorganic and organic substances in cell synthesis. 2) Uptake of CO2 by a leaf or canopy during the day time or plant foods utilized in building up a protoplasm and cell walls of the plant.

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