Abstract
Photosynthesis is related to dry matter accumulation in aboveground part of rice plant, which is the direct factor of production. This study carried out research on physiological indicators and the relationship between photosynthesis and dry matter accumulation under different water management in paddy field. In general, the photosynthetic and physiological indicators showed the trend of increasing and then decreasing with the growth stage of rice. Experimental results showed that, chlorophyll content and leaf area index of rice leaves showed a quadratic curve positive correlation. Canopy light transmission reached the maximum at heading-flowering stage, and it had quadratic relationship with leaf area index, while it showed extremely positive correlation under rain-water storage irrigation mode. Photosynthetic rate (Pn) and transpiration rate (Tr) had quadratic curve positive correlation with chlorophyll content. The water condition under rain-water storage was favorable for dry matter accumulation in panicle. After multiple regression and main factor analysis, canopy light transmission, light transmission coefficient and Pn were main factors related to dry matter accumulation. The conclusions in this article were helpful for promoting rice yield in practice. Keywords: physiological index, dry matter accumulation, canopy light transmission, regression analysis DOI: 10.25165/j.ijabe.20211403.5771 Citation: Li Y Y, Shao X H, Li Y B, Xiao M H. Dynamics of physiological characteristics and dry matter accumulation under rain-water storage irrigation. Int J Agric & Biol Eng, 2021; 14(3): 148–155.
Highlights
As one of the most important physiological processes of crops, photosynthesis is sensitive to field water condition[1]
Xu et al.[6] found that net photosynthetic rate decreased with the decreasing of soil moisture, and the difference between different soil water content became bigger when the light intensity was higher than 400 μmol/(m2·s), it could be recovered after re-watering
Lei et al.[18] and Zhu et al.[19] found that dry matter accumulation before jointing stage decreased under controlled irrigation during tillering stage, while the net photosynthetic rate and leaf area index at later growth stage increased
Summary
As one of the most important physiological processes of crops, photosynthesis is sensitive to field water condition[1]. Peng et al.[16] and Liu et al.[17] found dry matter accumulation under water deficit was significantly decreased during late jointing-booting and heading-flowering stages compared to control treatment, and appropriate leaf area index was remained to intercept more light under controlled irrigation. Lei et al.[18] and Zhu et al.[19] found that dry matter accumulation before jointing stage decreased under controlled irrigation during tillering stage, while the net photosynthetic rate and leaf area index at later growth stage increased. The leaf area index, net photosynthetic rate, transpiration rate, accumulation and allocation of photosynthate under non-sufficient irrigation treatment were lower than those of conventional irrigation treatment at early crop stage, while the compensation effect under non-sufficient irrigation was obvious at late stage[20]
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