Analysis On The Relationship Of The Greenhouse Temperature And The Growth, Production Of The Tomato

Greenhouse tomato production has increasingly become the main part in greenhouse industry in China, However, high temperature in summer appeal's one of the key factors influencing the yield of the tomato production. The research on tomato growth rules under the conventional temperature in a multi-span greenhouse was done in order to analyze the effect of the temperature, especially high temperature, on the vegetative growth and the generative growth, which could supply some information for the greenhouse management in summer, and supply the theoretical basis and data accumulation for the growth model of the greenhouse tomato. The results are as follows:1. In the experiments, the whole growth period was separated into three stages of 20.5℃ 25.5℃and 20.1 ℃, according to the daily average temperature, among which the second period of 25.5 ℃ was from 1 July until 13 August totally 43 days with the maximum temperature exceeding 35 ℃ for about 20 days. The fruit-set rate of the two cropping tomatoes declined to less than 60%, the absolute growth rate of tomato began to decreasewhen it was in the maximum. And the dry matter accumulation was declined finally.2. In three different temperature stages, it cost about 3.4, 3.6 and 7.1 days per leafgrowing, and 10.9, 11.2, and 14 days per truss appearance for spring tomato, whereas 3.4 and 4.2 days for one leaf growing, 8.4 and 15.9 days for one truss appearance in the last two temperature stage for the summer-autumn cropping.3. The maximum leaf area index of the two cropping is almost the same(1.4 and 1.34 respectively); the final fresh weigh of whole plant was about I2kg/m² and 8kg/m²; the final dry weigh was 1210g/m² and 770g/m²; the economic yield was 11.1 kg/m² and 9.1kg/m². The transformation rate of radiation was 1.5g dry matter MJm¹ PAR (photosynthetively activeradiation).4. The dry matter partitioning distributed to leaf was approximately 70% in the leaf enlargement stage, but in the full fruit picking, 50% of dry matter was partitioned into the fruit. During higher temperature stage, the distribution of dry matter on the current plant was largely the stem, differently from 45% to 71% due to the abortion of fruit and flower. The average dry matter content of roots, stem, leaves, and ripe fruits was 14.6%, 14.4%, 12.2% and 7.3% respectively, and not affected by the higher temperature.5. In the daily temperature of 25 ℃ to27℃, the diameter of the tomato was decreased by 0.13cm and fresh weigh of the tomato was decreased by 2.77g for increasing 1℃. The fruit development stage was 56.5 days at 25 ℃ and 50.7 days at 27℃.