. Frutti migliori. Frutti-coltura. Torre di rifugio per gli strumenti di radiazione. È stato trovato che praticamente tutto il fumo ri- mained sotto la parte superiore del riparo e dimostrano praticamente alcuna influenza sul rad- iation. solo circa il dieci per cento durante qualsiasi con- siderable periodo di tempo, sebbene in- dividual letture ha mostrato una diminuzione pari a tanto quanto 25 percento. (Vedere la figura 2). Osservazioni aggiuntive dello stesso tipo sono state effettuate a Medford, Oregon, durante la primavera del 1920, al di fuori e al di sotto di una fitta coltre di fumo pro- alleggerito da aprire lo strutto-secchio riscaldatori. La diminuzione media del tasso di radia-

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. Better fruit. Fruit-culture. Tower shelter for radiation instruments. It was found that practically all the smoke re- mained below the top of the shelter and showed practically no influence on the rad- iation. only about 10 per cent during any con- siderable period of time, although in- dividual readings showed a decrease amounting to as much as 25 per cent. (See figure 2). Additional observations of the same kind were made at Medford, Oregon, during the spring of 1920, outside and under a dense blanket of smoke pro- duced by open lard-pail heaters. The average decrease in the rate of radia-. Kadilinn in.str tion due to the smoke was 9 per cent, with an individual reading which showed a decrease of 26 per cent. The rate at which heat is radiated from the ground decreases very rapidly as the temperature falls. As the orchard heaters are not lighted until the tem- perature has reached a comparatively low point, a reduction of even 25 per cent in the radiation at this time is not very important; in order to prevent damage through the use of the smoke cover alone, the rate of radiation would have to be cut down at least 80 per cent. It is evident that the smoke would be of far greater value in protection against frost damage if it were com- pletely consumed in the heaters. The smoke may often be of indirect benefit in preventing a too rapid thaw- ing of frozen fruit or blossoms at sun- rise, but from the data at hand it ap- pears that neither in this connection nor in its influence in reducing the rate of radiation of heat to the sky, is dam- age from a moderately severe frost to be prevented by a smoke cover alone. When the lowest temperature during the night is only slightly below the dan- ger point, a heavy smoke from smudge fires may lessen or prevent damage, but to combat a frost which would other- wise cause widespread damage, it is necessary to supply great quantities of heat to the surface air to replace that which has been lost by radiation to the sky. In mos

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• bookcollect
• bookcollectionbiodiversity
• booksubjectfruitculture