Based On Physiological Characters, Study On The Effects Of Different Culture On The Output And Quality For Cherry Tomato

With the development of agriculture technique, bio-agriculture technique was widely put into practice. Soilless culture became more and more useful. It maked a breakthrough at the soil culture of traditional agriculture. Soilless culture used different substrates and nutrient solution containing necessary elements for plant growth which offered nutrient to plants so that they could finish their life period normally. At the same time ,we would get products which were good in quality, delicious in taste and high in output. Soilless culture had several sorts based on substrates. They were solid substrate culture and solidless substrate culture. The solid substrate culture coud be divided into organic, inorganic and mixed substrate culture;Solidless substrate culture was sorted to water, frog and air culture. Amonst them ,water culture had two forms based on different deepth of nutrient solution. One was Nutrient Film Technique(NFT), The other was Deep Flow Technique(DFT).Soilless culture had the merits of ecological security, avoiding soil saltier ,soil borne insects and disease and high utilization of fertilizer. The process of cultivation was easy to control. Products in soilless culture got more and more likeness.This experiment was carried out from Januaryto to October in 2003 under NFT system, DFT system and substrate culture in the east-China type multi-span plastic greenhouse and artificial climate chamber, which located in the Institute ofAgriculture Bio-environment, Zhejiang University. On the basis1 of analysis some physiological indices, mineral substance absorption of soilless cherry tomato ,its output and its nitrate containing are evaluated wholly and systematically. The main results were as follows:(1) Mineral substance absorption of cherry tomato in the systems of NFT,DFT and mixed substrates were compared with ones of cherry tomato grown in soil culture. The results showed that solid mixed substrates were superior to soil. NFT was not as good as mixed substrates but better than soil. As for DFT, when it was offered with oxygen , its absorption got high. But if no oxygen was offered, its valid was low.(2) By the experiment of substrates for soilless culture on cherry tomato, we could find out there were different influences on the physiological character of cherry tomato such as succinic dehydrogenase activity in the root tissue> photosynthic characteristics and its output . The experimental results showed when some organic substrates and some inorganic substrates were mixed together at some extent ratio in soilless culture, it could obviously advance some physiological characters of cherry tomato and its output.(3) Pearl rock , sawdust and 50% sand+50% sawdust were taken as substrates. Their effects on nitrate content in cherry tomato were studied. The results showed nitrate content in mixed substrates culture was higher tnan soil culture, while in pearl rock substrate,it was the highest.