《Table 3 Changes of the light intensity at different growth stages》

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《Environmental Factors for Different Growth Stages of Small Watermelons in Spring Greenhouse in Beijing》

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Spring greenhouse:the average daily light intensity was in the range of 551.98-10 462.16 Lux，and the maximum daily light intensity was in the range of 2 172.27-50 069.70 Lux.The seedling hardening stage（March 8 to March 15）:field planting to rosette.From Fig.3，it can be known that at the seedling hardening stage，the average daily light intensity was in the range of2 359.15-8 207.44 Lux，the average value was 3 663.80 Lux；the maximum daily light intensity was in the range of 9 307.43-17 337 Lux，and the average value was 13 528.42 Lux.The tendril elongation stage（March 15 to April 10）:rosette to the blooming of the second female flower of the main tendril.From Fig.3，it can be known that at the tendril elongation stage，the average daily light intensity of the demonstration greenhouse was in the range of551.98-9 170.77 Lux，the average value was 4 599.21 Lux；the maximum daily light intensity of the demonstration greenhouse was in the range of 3 829.72-32 556.88 Lux，and the average value was 18 906.80 Lux.The fruiting stage（April 10 to May 30）:the blooming of the second female flower of the main tendril to the ripeness of watermelon（first crop watermelon）.At the fruiting stage，the average daily light intensity of the demonstration greenhouse was in the range of 1 253.59-9 644.01 Lux，the average value was 5 733.30 Lux；the maximum daily light intensity of the demonstration greenhouse was in the range of 4 706.40-50 069.73 Lux，and the average value was 24 457.15Lux.