HomeInternational Rice Research Notesvol. 29 no. 2 (2004)

Effects of low light on yield and physiological attributes of rice

M. Lakshmi Praba | M. Vanangamudi | V. Thandapani

Discipline: Agriculture



The rice crop in India occupies about 40 million ha of land, mostly raised during the wet season (July-October). However, yield in this season is very low, averaging around 1.2 t ha-l. The major cause of impaired yield is reduced light intensity due to overcast skies prevailing during this season (Murty et al 1975). Since sunlight is critical in photosynthesis, it has been well documented that, under low sunlight, dry matter accumulation is impaired. Information on key physiological parameters is therefore necessary to understand the nature of yield manipulation in the wet season. This study aimed to determine the influence of induced low light at different growth stages of the rice crop and the consequent changes in its physiological and yield components.