Abstract:

In order to provide a theoretical basis of pear cultivation in plastic tunnel, the features of air temperature, relative humidity, soil temperature and phonological phases of pear were surveyed and compared in plastic tunnel and open field for pear in 2010. The results indicated: (1) The air temperature and soil temperature were gradually rising, but the air temperature, air relative humidity, soil temperature and day-and-night temperature difference in the plastic tunnel were higher than those in the open field before June. Then the temperature in the plastic tunnel hasn't been significantly different from that in the open field. (2)The beginning of flowering stage of ‘Cuiguan’and ‘Huangguan’ pear cultivated in plastic tunnel was 18 days earlier than those cultivated in open field, and the flowering stage was 2 days longer. (3)Compared with cultivated in open field, the harvesting day of ‘Cuiguan’ pear cultivated in plastic tunnel was 13 days earlier and it's fruit ripening stage was 5 days longer, while the harvesting day of ‘Huangguan’pear cultivated in plastic tunnel was 14 days earlier and it's fruit ripening stage was 4 days longer. (4)Compared with cultivated pears in open field, ‘Cuiguan’ pear and ‘Huangguan’pear cultivated in plastic tunnel sprouted earlier and defoliated later, and the whole vegetative growth stage of ‘Cuiguan’ pear was 242 days and was 27 days longer, while ‘Cuiguan’ pear was 231 days and was 37 days longer. The study showed that because of higher temperature and higher humidity, the flowering stage and the fruit ripening stage of pear in plastic tunnel began earlier, so the pear can be cultivated in plastic tunnel in Nanjing.