such as humidity, temperature, wind and precipitation. 1.1.3 In agricultural meteorology, macro and micro scale observations are required. While macro-scale observations provide information on the climatic background, most of the agricultural planning and research activities require data on the meso- or micro -climatic scales. Standard instrumentation and standard exposure conditions in agricultural meteorology, are important as far as comparability is concerned. However, in research work, instruments and exposure conditions are not always standard. 1.2 Meteorological Stations 1.2.1 Basic information on the physical environment can be obtained from observations made at stations of the synoptic, climatological and hydrological networks. Since these networks maybe restricted in density and in kind of observation, it is desirable that they be supplemented by
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