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Rice canopy temperature is affected by nitrogen fertilizer

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  • 国家科技期刊平台
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Canopy temperature strongly influences crop yield formation and is closely related to plant physiological traits.However,the effects of nitrogen treatment on canopy temperature and rice growth have yet to be comprehensively examined.We conducted a two-year field experiment with three rice varieties(HD-5,NJ-9108,and YJ-805)and three nitrogen treatments(zero-N control(CK),200 kg ha-1(MN),and 300 kg ha-1(HN)).We measured canopy temperature using a drone equipped with a high-precision camera at the six stages of the growth period.Generally,canopy temperature was significantly higher for CK than for MN and HN during the tillering,jointing,booting,and heading stages.The temperature was not significantly different among the nitrogen treatments between the milky and waxy stages.The canopy temperature of different rice varieties was found to follow the order:HD-5>NJ-9108>YJ-805,but the difference was not significant.The canopy temperature of rice was mainly related to plant traits,such as shoot fresh weight(correlation coefficient r=-0.895),plant water content(-0.912),net photosynthesis(-0.84),stomatal conductance(-0.91),transpiration rate(-0.90),and leaf stomatal area(-0.83).A structural equation model(SEM)showed that nitrogen fertilizer was an important factor affecting the rice canopy temperature.Our study revealed:(1)A suite of plant traits was associated with the nitrogen effects on canopy temperature,(2)the heading stage was the best time to observe rice canopy temperature,and(3)at that stage,canopy temperature was negatively correlated with rice yield,panicle number,and grain number per panicle.This study suggests that canopy temperature can be a convenient and accurate indicator of rice growth and yield prediction.

canopy temperaturericephysiological and biochemical characteristicsyield

Min Jiang、Zhang Chen、Yuan Li、Xiaomin Huang、Lifen Huang、Zhongyang Huo

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Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Agricultural College,Yangzhou University,Yangzhou 225009,China

Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops,Yangzhou University,Yangzhou 225009,China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNatural Science Projects of Universities in Jiangsu Province,ChinaPriority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),China

2022YFD15004043180131021KJA210001

2024

10.1016/j.jia.2023.05.005

农业科学学报(英文)
中国农业科学院农业信息研究所

农业科学学报(英文)

CSTPCD
影响因子：0.576
ISSN：2095-3119
年,卷(期)：2024.23(3)
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