For optimum crop growth, specific climatic conditions are required. Agrometeorology thus becomes relevant to crop production because it is concerned with the interactions between meteorological and hydrological factors on the one hand and agriculture, in the widest sense including horticulture, animal husbandry, and forestry, on the other (Figure 1.1). Its objective is to discover and define such effects and to apply knowledge of the atmosphere to practical agricultural use. The field of interest of an agrome-teorologist extends from the soil surface layer to the depth down to which tree roots penetrate. In the atmosphere he or she is interested in the air layer near the ground in which crops and higher organisms grow and animals live, to the highest levels in the atmosphere through which the transport of seeds, spores, pollen, and insects may take place. As new research uncovers the se-

crets of meteorological phenomena, there is increasing interest in remote sensing and interactions between oceans and the atmosphere in shaping seasonal conditions.

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