Assume that Tj refers to the average temperature on the jth
day in the ith stage of tomato; Tbi, Tmi and Toi refer to the floor
temperature, ceiling temperature and optimum temperature
for tomato growth in its ith stage; pi refers to the temperatureincrease
promotion coefficient, and its value reflects promotion
to the tomato development rate as the temperature
increases from Tbi to Toi; qi refers to the high-temperature
inhibition coefficient, and its value reflects inhibition to the
tomato development rate as the temperature increases from
Toi to Tmi. gi is the photosensitive coefficient, a high gi means
tomato is sensitive to illumination, a low gi means tomato is
insensitive to illumination, and when gi is zero, it means the
tomato has no photosensitivity at all; Dj refers to the illumination
duration on the jth day in the ith stage of tomato; Doi
and Dbi refer to the optimum critical illumination durations
required by tomato growth in its ith stage. The temperature
impact factor function and illumination impact factor function
are: