Analysis On Plant Production And Yield Forming Of Greenhouse Tomato In Long-season-cultivation

A long-season-cultivation of greenhouse tomato was conducted in an unsymmetrical multi-span greenhouse. Plants were transplanted from 8 March. At the early days in October, the apex of plant was removed. And the average length of plant stem can grow up to 4m, with about 70 leaves and 20 trusses on the plants. And the apex-removed plants continued to grow to December. Therefore, the whole growing period was 293 days. The production, the yield forming and some influencing factors on the greenhouse tomato in long-season-cultivation were analyzed in this thesis. The results were shown as follows: 1. In the whole growing season, the relationship between the accumulative dry matter of tomato plant and the integral photosynthetically active radiation (PAR) is linear. Under the present experimental conditions, the production efficiency of a unit PAR was 1.52gMJ-1 PAR. In this experiment, the strength of solar radiation did not restrain the tomato growth for the old plastic film. 2. In present experiment plants were transplanted from March, the seasonal change of the yield during the harvesting was acute, the production in July and August was high, while in pre-July and after-August the production was low. 3. The truss yield was also varied. Truss 6th to the truss 11th had high yield of 52.4% that of the whole plant production, while the production of the other trusses was less than 50%. 4. Among the component factors of the truss yield, average fruit weight did not change very much. The relationship between fruit number of each truss and the truss yield is linear: y=61.765x+2.2615, r=0.9555, so the percentage fruit-set was thought as the main factor to the truss production. 5. In the early season (from the 1st to 5th truss) of the tomato growth, the main factor that affects the percentage fruit-set was the plant status; in the later season, was the high temperature: when the average daily maximal temperature increased 1℃,the truss percentage fruit-set wound drop 5.1%. The percentage fruit-set was 64% and 22% when the average daily maximal temperature was 30℃and 39℃, respectively.