Artificial climate chamber affects population photosynthetic rate
The artificial climate chamber is used for the determination of the population photosynthetic rate, and error analysis of the entire system is necessary. According to the previous analysis of the Netherlands greenhouse climate greenhouse (DSG), all the measurement factors used for the calculation may have errors, but generally as long as the error of each factor is controlled within 5%, the measurement results can be achieved. System analysis requirements. In general, there are two factors that may cause large errors in the intelligent artificial climate room: (1) Because there is no CO2 concentration sensor outside the climate, the calculation of the leakage rate uses a constant outdoor CO2 concentration (358 μmol. Mol-1), rather than the actual value outside; (2) The moisture generated by the humidifier is obscured by the light sensor, which may result in the measured value of the light intensity being lower than the actual value.
According to the calculation, the system reaction time is in line with the requirements of the system analysis. The delay time does not exceed the allowable limit. The overall response time of the sensor used is 12 s, the delay time is ≤ 16.5 s, and the reaction time of crop photosynthesis to environmental conditions is about 70 s. (Tomato results), while the minimum measurement interval in the experiment was 5 min and the calculation interval was 1 h, which was in line with the system analysis requirements.
Since the tissue culture room environment, cultivation patterns, and management techniques are actually different from those of various types of greenhouses and different greenhouse production management, the leaf area index of the melon-like plant used in this article is relatively low, and the actual production value ( The difference between 2.5 and 2.8) is large, so the measurement data may be different from the actual field data. Therefore, it may be better to use climate chambers that are closer to actual production and management and closer to the greenhouse environment, especially natural light type artificial climate chambers.
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