Optimum Environment Management Indicators for Greenhouse Tomato

Abstract：There are great changes between the crop growth environment inside and outside the greenhouse. In order to achieve the purpose of reasonable control on greenhouse crop growth environment, afield experimental research on seeking optimum environment management indicators for greenhouse tomato was taken in E-Zhou water-saving irrigation experiment station, Hubei province in China. In the measurement, a phytomonitor for plants (No- LPS- 05) was used for a real-time monitoring crop physiological parameters and environmental parameters. Through the qualitative analysis of micro dynamic responses of tomato major organs (stem, leaves) to the related changes of indoor temperature and humidity environment, the appropriate environment management standards for greenhouse tomato growth were confirmed: (1)the optimal critical minimum temperature at night for tomato stem diameter growth was 17.8 ℃ (2)the leaf surface vaporization happened respectively at 09.30 (fine day) and 11-30 (rain day), lagging one hour than air vaporization in the two kinds of typical weather conditions (3)On the premise of enough soil moisture, "2.7 kPa" was the critical value of saturation vapor pressure difference, which could lead to greenhouse tomato water stress.