Effect of Silicate Application on Rice Physiological Properties under Nighttime Warming

doi:10.3969/j.issn.1000-6362.2017.10.005

Abstract

Abstract: Field experiment with rice was conducted to investigate the effects of silicate (Si) application on variations of net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductivity (Gs) and intercellular CO2 concentration (Ci) at the tillering stage, jointing stage, filling stage, maturity stage under nighttime warming. The experiment was designed with two nighttime warming levels, i.e. nighttime warming (NW) and control (CK, ambient temperature), and two Si application levels, i.e. control (Si0) and Si1 (slag fertilizer, 200kg SiO2·ha-1). The results showed that, (1) nighttime warming increased the temperature of rice canopy and of 5cm depth soil by 1.21℃ and 0.41℃ at night (19：00-6：00) during entire rice growth season. (2) Nighttime warming decreased Pn, Tr, Gs by 11.0%, 9.0% and 20.2%, but increased Ci by 1.2%. Silicate application increased Pn and Gs by 16.1% and 25.8%, but decreased Tr and Ci by 11.0% and 2.0%; silicate application increased Pn and Gs by 22.0% and 33.6%, but decreased Tr and Ci by 7.7% and 2.3% under nighttime warming. It is suggested that nighttime warming decreased Pn, Tr and Gs, but increased Ci, in contrast, silicate application increased Pn and Gs, but decreased Tr and Ci. Namely, silicate application mitigated obviously the depressive effects of nighttime warming on photosynthetic properties. (3) The effect of nighttime warming or silicate application on chlorophyll content (SPAD value) was not obvious. Nighttime warming decreased SPAD value by 3.0%, but silicate application increased SPAD value by 4.7%. Compared with Si0, silicate application increased SPAD value by 5.7% under nighttime warming.

Key words: Nighttime warming, Silicate application, Rice, Growth stage, Photosynthesis

ZHENG Ze-hua, LOU Yun-sheng, ZUO Hui-ting, SHI Yi-fan, WANG Ying. Effect of Silicate Application on Rice Physiological Properties under Nighttime Warming[J]. Chinese Journal of Agrometeorology, 2017, 38(10): 663-671.

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