Effect Of Plastichouse Cultivation On The Plant Growth And Fruit Development In ’Danshansuli’ Pear

’Dangshansuli’pear originated from Anhui Dangshan, which cultivation has a very long history and an important late maturing Pear Cultivars. In recent years, because of extensive management, decreasing production inputs, climate change and so on, the quality of’Dangshanli’pear dropped. Therefore, many different cultivation measures and Super High-yielding Technique research about transformation of soil, fertilizer and orchard; the cover plants and that of mulching. However, the study of’Dangshansuli’pear plastichouse cultivation is few and the mature successful technology in productioncan is fewer.’Dangshansuli’pear was selected as the research materials by means of combined with the plastichouse cover and cultivation management technology. Effects of plastichouse temperature and humidity, light intensity, phenophase, growth characteristics on the quality of ’Dangshansuli’pear fruit were studied, to provide theoretical and practical basis for new cultivation mode of’Dangshansuli’pear. The main results are as follows:1. In the environment of plastichouse cultivation of’Dangshansuli’pear, of which daily average temperature was 0.56 ℃ higher than the growth period to open. At the end of February to the end of March, the temperature difference between inside and outside greenhouse was relatively large. The change of inside greenhouse average humidity was relatively stable, which was maintained at 59%～69% most of the time, and was lower 3.08% than the average humidity of outside greenhouse.2. The light intensity of the trees inside and outside the canopy displayed with sunshine intensity by the weak strong weak change was consistent. However, the light intensity of plastichouse inside was lower than the outside.The light intensity impairment rate inside greenhouse became larger with the sunshine intensity enhancement from 9:00. which loss rate generally rangede from 35% to 45%.3. The phenology of plastichouse cultivation was earlier than that of the outdoors, and the sprout, first-flowering, flowering, the fallen flowering of inside plastichouse were respectively in advance 5 days,3 days,4 days,4 days than that of the outside; Fruit ripening by 2 days.4. The ’Dangshansuli’ pear of plastichouse cultivation, whose leaf chlorophyll content decreased along the growth stages. The chlorophyll content and shoot growth outside plastichouse were higher than those of inside. Single leaf thickness and leaf weight ratio were quite the contray.5. The growth and development of ’Dangshansuli’ pear under the plastichouse cultivation presented by the process of "slow-fast-slow" growth pattern. Fruit vertical diameter, transverse diameter and weight rised slowly during the young fruit period inside plastichouse, which were almost the same with the dynamic growth with outdoors. Going into the fruit expansion phase, the growth rate of the fruit vertical diameter, transverse diameter and weight significantly accelerated. Fruit diameter growth rated higher than the transverse diameter. Of which growth rate slowed down when it went into fruit mature period. To harvest, the shape of fruit presented similarly both indoors and outdoors. The average weight was fairly, and the fruit transverse diameter was slightly larger than the vertical diameter.6. Under the fruit maturing period, the surface of ’Dangshansuli’ pear inside plastichouse cultivation showed a yellow-green light and the spot on the fruit was smaller and the density became thinning. The production in the greenhouse cultivation reduced 2.42 per square centimeter than that of outdoors; The fruit average weight and yield achieved up to 300 g and 2500 kg per 676 square metre, which can meeted the needs of both the high-quality fruit production and marketing. By the plastichouse cultivation experiment and comparison of between plastichouse cultivation and outdoor cultivation, the results showed that the content of the fruit pulp stone cell was 0.25-0.50 mm which can increase 0.053 g per 100 g of fruit; when reach to 0.5-0.75 mm which would reduce 0.002 g per 100 g of fruit. The fruit pulp stone cell was larger than 0.75 mm which can increase 0.012 g per 100 g of fruit; However, there was no significant difference in the total dry weight of pulp stone cells.