Effect of Silicate Application on Hybrid Rice Growth and Yield under Nighttime Warming

doi:10.3969/j.issn.1000-6362.2018.06.004

Abstract

Abstract: Field experiment with rice was conducted to investigate the effects of silicate (Si) supply on tiller number, leaf area index, biomass and yield at tillering stage, jointing stage, heading stage, filling stage and 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 supply levels, i.e. control (Si0) and Si1 (slag fertilizer, 200kgSiO2·ha-1). The results showed that, (1) nighttime warming increased the average temperature on rice canopy and at 5cm depth soil by 1.21℃ and 0.41℃,the lowest temperature by 1.21℃ and 0.62℃, and the highest temperature by 1.20℃ and 0.28℃, respectively, at night (19：00-6：00) during entire rice growth period. (2) Nighttime warming decreased tiller number, leaf area index, above-ground biomass, below-ground biomass and yield by 10.81%, 5.65%, 8.20%, 3.29% and 4.45%, respectively. Silicate application increased the above indicators by 16.22%, 11.18%, 14.16%, 6.51% and 22.10%, respectively, and increased the above indicators by 16.67%, 11.71%, 12.56% and 20.90% under nighttime warming. (3)Nighttime warming decreased effective panicles, filled grain numbers per panicle, 1000-seedweight and maturing rate by 2.66%, 12.72%, 1.53% and 2.06%, respectively; silicate application increased the above indicators by 6.91%, 15.49%, 2.00% and 4.48%, respectively, silicate application increased the above indicators by 4.37%, 22.50%, 2.15% and 3.31%, respectively, under nighttime warming. It is suggested that silicate application had significant effects on rice growth and grain yield, mainly concerned with effective panicles and filled grain numbers per panicle.

Key words: Nighttime warming, Silicate application, Rice, Biomass, Filled grain numbers per panicle, Si fertilizer

ZHENG Ze-hua, LOU Yun-sheng, ZUO Hui-ting, SHI Yi-fan, WANG Ying. Effect of Silicate Application on Hybrid Rice Growth and Yield under Nighttime Warming [J]. Chinese Journal of Agrometeorology, 2018, 39(06): 390-397.

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