园艺专业英语课文doc.docx

园艺专业英语Lesson 1The History and the Development of Protected CultivationSelected and rewritten from u The History and Geography of the Greenhouse by Il・ Zvi Enoch and Yaeln Enoch, in Greenhouse Ecosyslems20, echled by G・ Stanhill and H・ Zvi Enoch, a series book of Ecosystems ofthc World (Li Yaling, Shanxi Agricuhural University)This lesson briefly describes the development of the greenhouse from antiquity to the present day. Il includes a discussion of p「o(ec(ed cropping in cokband ho(・fames, glass cloches, lean-to houses, winter gardens orangeries, conservatories and glasshouses in their varied forms, and plastic-clad plant enclosures of all sizes ranging from low tunnels • walk-in tunnels, to large plastic houses・For the purpose of this lesson, the greenhouse is defined as a transparent enclosure designed to grow or temporarily protect plants ・ Thus the definition does not include enclosures for growing mushrooms or tissue cultures・In antiquity, however there were probably no greenhouses in the sense defined here> but there were various practices adopted to provide out-of-secison flowers and vegetables・The cultivation of out-of-season plants was intensely studied in ancient Athens and Rome・ This Can be seen for instance in the work of Theophrastus [who lived from 372 to 287 BCE (before the common era)]. He mentioned moving plants into the peristyle (verandah iii a dosed courtyard of a Greek house) at night and heating soil by mixing it with decaying manure or compost.Growers in China> Mesopotamia Egypt, Israeh Greece and Rome grew valuable plants in pots and placed them indoors at night or during cold periods to protect them ・ Sometimes plants were grown on wheelbarrdws that could easily be brought into a grotto cellar or room at night. Chinese plant culture may have included greenhouses that xcording to tradition, go back to antiquity. A Chinese greenhouse(Fig. 1-1 in the text book ) consisted of a brick wall oriented east-west. On its southernside, a transparent surface consisting of bamboo sticks covered with oiled paper was placed at an angle 30 ・40 to the horizontal. During the day, the brick wall became heated by the sun and at night it released its heat ・ In add it ion> at n ight the paper window was covered by rush mats which acted as thermal insulation. Similar simple greenhouses are in use today♦ and it is claimed that they increase the night temperature by up to 69C ・In the 20th century > in both northwestern Europe and North America > there was a development from smaller to larger greenhouse units 9 usually even・span or ridge・ and furrow multi-span houses・ The Use of small electrical motors allowed automated climate control, including the opening of vents ・ Heating by thermsiphon hot water circulation was replaced by forced circulation・ Electrical putnps were used for irrigation and to operate shading systems, etc.Lean-to glasshouse slowly became obsolete and heating by smoke flues disappeared in the first decades of the 20thcentury・ However> these changes all occurred very gradual!y・ An example of this development in the Netherlands is outlined below・Simple over-winter sheds were used in Aalsmeer, the Netherlands, up to the 1920% and storc-framcst placed against the walls to protect vines in the Westland region were photographed in 1928.At the beginning of the 20th century, 90 % of the area used for protected cultivation in the Netherlands consisted of cold frames or hotbeds (heated by decomposition of manure and compost)・ By 1950, the area was still about 30%, and in 1964 it was 10% ・The use of Dutch lights was introduced at the beginning of the 20th century. Initially, only single-span frames were used； double -light frames date from about 1920・ Comparing the building practices in the Netherlands with those in the more advanced United States one sees that in 1904, 90 % of the glass-covered area in the Netherlands con sisted of light frames ・ while 25 % of the glass・covered area in the US A in the year 1900 was of proper glasshouses ・ The area under glass in the Netherlands increased from 1.6 km2 in 1904 to 4.0 km2 in 1912, to 32. 9 km2 in 1950, reaching 60.2 knf in 1964.Heating and carbon-dioxide fertilization of hotbed through the decomposition of mixtures of horse manure and plant residues was widely used in the Netherlands at the beginning of the last century, and remained the com IT Ion way for growing cucumbers and melons until horses were replaced by tractors in the years after the Second World War.Claassen and Haze loop (1933)mentioned that at that time flue heaters were only used by a few growen; in the Netherlands♦ whereas in Belgium* most of the 4.40 kirT used for fruit-growing in 1939 was heated by flues. Dutch greenhouses suitable tor a variety of crops were developed gradually over half a century. In 1900, at Loosduinen a steel-framed greenhouse was built which became the forerunner for the “\Enlo Warenhuis?\ a house that could be used for。