Effects of the application of row spacing adjustment apparatus on the light and temperature environment of solar greenhouses
In order to optimize the light and temperature environments in the greenhouse of tomato planted in east-west ridges,a comparative experiment was conducted in the Fangshan,Beijing.The fixed row spacing was taken as the control to investigate the effects of the application of the row spacing adjustment apparatus on the light distribution in the canopy and the temperature environment inside the greenhouse of tomato grown in east-west double rows.The spacing between rows on the ridge in fixed spacing mode is 40 cm and the spacing between rows on the ridge after dynamic spacing adjustment is 80 cm.In both modes,the spacing between rows in the center of the ridge in both modes are 180 cm.The results indicated that:1)The row spacing adjustment apparatus effectively enhanced the light interception in tomato canopies by enlarging the space between rows on the ridge,and the test area had a higher average light intensity than the control area.Two-thirds of the height of the canopy in test area was significantly higher than the control area during the afternoon hours(P＜0.05).2)The increase of spacing between rows on the ridge reduced the coefficient of variation of light distribution by 14.4％-26.0％,which significantly improved the uniformity of light distribution in the greenhouse(P＜0.05).3)Application of row spacing adjustment apparatus led to a significant increase in the temperature of the back wall,and the temperature of the back wall in the tested area was more than 3 ℃ higher than that in the control area from 2:00 to 11:00.Meanwhile,the temperature of the ground in the test area at night was maintained at a higher level,which was about 0.5 ℃ higher than that of the control area.4)Application of row spacing adjustment apparatus maintained the temperatures of the middle and south sides of the tomato canopy in the third row at a higher level at night,with the night temperature of the test area of the canopy was 0.5 to 0.7 ℃ higher than that in the control area.In general,the application of the row spacing adjustment mechanism can effectively improve the light and temperature environment in the solar greenhouse.This study demonstrated that the row spacing adjustment apparatus can be applied in the east-west cultivation of mechanized solar greenhouse.
row spacing adjustment apparatuseast-west ridgecultivation methodlight and temperature environmenttomato
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