Abstract
China solar greenhouse cultivation was mainly planted with soil and the continuous production cannot be achieved resulting from the seriously soil-borne diseases. In addition, excessive water and fertilizers from the production process were discharged into soil, not only resources were wasted, but also environment were polluted. In this study, the ditches be made of north-south direction in greenhouse ground, substrate were filled in the bags or completely wrapped by plastic film, and then it was be put into the ditches. Crops were planted into the substrate, so the roots of crops were isolated from the external soil then closed cultivation was implemented, the soil-borne diseases were avoided and heats which were stored by the soil can be used to maintain temperature of the substrate during the winter. In order to achieve the recycling, the recycling system of water and nutrient were constructed, and then excess water or nutrient solution can be connected into a recycling tank, then the nutrient solution will be pumped into the mixing tank. Mixing tank contained nutrient solution that is used for irrigation, water and fertilizers can be mixed according to the desired ratio then it was transferred to the crop to provide water and nutrients by irrigation pipes. Experiments show that, a total of 2380 kL/hm2 of irrigation water were applied during the 12 weeks crop growing period, it was 69.4% of the water consumption of traditional soil planting patter, and the water use efficiency of closed cultivation system was 16.49 kg fresh tomato/kl applied water, it was 1.47 times than the water productivity of traditional soil planting pattern.
