By Professor Dr. J. Seemann, Professor Dr. Y. I. Chirkov, Professor Dr. J. Lomas, Dr. B. Primault (auth.)
Agrometeorology is a relatively younger technological know-how. The beginnings of agrometeorological paintings got here within the 20's of this century, while agrometeorology was once a operating department of climatology. within the years following 1950 it then constructed greatly to an self sufficient technology. during this method, agrome teorology has not just received an unlimited wisdom of the impression of meteorological stipulations on crops and farm animals in agriculture and harm prevention, but in addition developed new advisory equipment that are of serious sensible use in agriculture. as much as the current time there was virtually no particular education for an agrometeorologist. Agrometeoro logists are drawn, in accordance with their education, from the ranks of common meteorology or from agriculture and its comparable organic disciplines. they have to, accordingly, them selves assemble the information for his or her agrometeorological paintings and mix for themselves the advanced of agrome teorology from organic and meteorological info. this is often usuaIIy faraway from effortless, because the appropriate literature is scattered one of the most generally differing journals, in part in little-known overseas languages, and is hence very tricky of entry. entire writings are to be chanced on purely in only a few partial fields of agrometeorology. the topic of educating difficulties has hence been taken care of as of maximum value on the conferences ofthe fee for Agrometeorology (CAgM) of the area Meteorological association (WMO), specially as agrometeorology has received such nice importance and worthy ness not just within the so-called underdeveloped nations in advancing a extra effective agriculture, but additionally in coun attempts whose agricultural commonplace is already high.
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Decisive for the heat transport in air is mass exchange. In mass exchange, "air packets" of differing size are exchanged for each other, where the contents (heat, water vapor, gas, dust particles) are carried along. Schmidt (1925) already published basic knowledge on this exchange. The exchange process takes place in an entirely irregular manner. The mixing processes that take place in the atmosphere are consequences of disordered movements (turbulence) that take place in the atmosphere. , the shape of the boundary layer".
Hydrograph. Marit. Meteorol. : Turbulent transfer in the lower atmosphere. Proc. Canberra Symp. 1956. UNESCO, Paris 1958 Thornthwaite,e. : Measurement of evaporation from land and water surfaces. S. Dept. Agric. Tech. Bull. No. 817. Washington 1942 9 Transfer of Quantities of Air Masses (Momentum Transfer) B. 1 The Air Which Surrounds Us The planet Earth, third in order of distance from the sun, is surrounded by a gaseous envelope called the "atmosphere". This film of air is made up of a mixture of various gases, most of which consists of nitrogen (chemical symbol N), accounting for about 4/5 while oxygen (0) comprises the final fifth.
In growing vegetation, the measurement heights must be adjusted to the longitudinal growth of the vegetation. Wind velocities are measured at the same elevations as the instruments for temperature and humidity measurements, by means of anemometers. In the selection of these instruments it is important that these produce measurements even with very low wind velocities. For heat household measurements over vegetation, a third anemometer should be placed into the vegetation at approximately 50 cm in height.
Agrometeorology by Professor Dr. J. Seemann, Professor Dr. Y. I. Chirkov, Professor Dr. J. Lomas, Dr. B. Primault (auth.)