Research on water deficit diagnosis of maize based on canopy temperatuwe
Canopy temperature is an important indicator to judge the crop water condition.The variety Liang Yull was used as test crop,and four different soil moisture stress treatments were carried out for tasseling stage of the maize in 2014 and 2015.The relationships between canopy temperature,canopy-air temperature ratio,canopy-air temperature difference with soil moisture were researched,and relationship between canopy temperature with stomatal conductance was analyzed.The results were shown that:when the soil water content was less than 0.16 cm3 ·cm-3,the plant was appeared obvious wilting,at this time,the canopy temperature,canopy-air temperature ratio and canopy-air temperature difference were reached the maximum as 34℃,1.2℃ and 5℃,respectively.Along with the soil water content was increased to 0.20 cm3 · cm-3,the canopy temperature,canopy-air temperature rate and canopy-air temperature difference were reached the least values about 30℃,1.0℃ and 1℃,at this time the plant growth was good,it was explained that soil water supply was sufficient and plant was not suffered water stress.There was the distinct linear relationship between the canopy temperature and stomatal conductance,the stomatal conductance was linearly decreased with increasing canopy temperature.It was indicated that stoma close will be let the canopy temperature notable increase.This research results can be provided the technical support for diagnosis of crop drought and drawing up the irrigation schedule.
国家科技期刊平台
NSTL
万方数据
维普
