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Open AccessFeature PaperArticle

Effect of Different Silicon Sources on Yield and Silicon Uptake of Rice Grown under Varying Phosphorus Rates

1
School of Plant, Environmental, and Soil Sciences, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA
2
CAPES Foundation—Ministry of Education of Brazil, Brasilia 70040-031, Brazil
3
Department of Plant Pathology & Crop Physiology, Louisiana State University AgCenter, Baton Rouge, LA 70803, USA
*
Author to whom correspondence should be addressed.
Plants 2017, 6(3), 35; https://doi.org/10.3390/plants6030035
Received: 31 July 2017 / Revised: 24 August 2017 / Accepted: 26 August 2017 / Published: 29 August 2017
(This article belongs to the Special Issue Practical Use of Si to Influence Plant Production)
A series of pot experiments were conducted to: (1) evaluate the effects of different Si sources (soil- and foliar-applied) on grain yield and Si accumulation of rice supplied with varying P rates, and (2) evaluate Si absorption of rice using foliar- and soil-applied Si fertilizers. Three P rates, (0, 112, and 224 kg ha−1) combined with five Si treatments (wollastonite and slag applied at 4.5 ton ha−1 and one foliar Si solution applied at 20, 40 and 80 mg Si L−1) and a check were arranged in a randomized complete block design with four replications. The presence of P and Si in the soil created a synergistic effect on soil Al, Mn, and As (P < 0.01), but not on rice growth and P uptake. Wollastonite and slag application were most effective in raising rice Si content than foliar applied Si (P < 0.001). While there was an improvement in biomass (42%) and tiller production (25%) for rice receiving foliar Si, no supporting evidence was obtained in these experiments to verify leaf surface Si absorption. The application of Si-rich materials to soil still remains the most effective method for enhancing Si uptake by plants. View Full-Text
Keywords: foliar Si solution; Si deposition; Si uptake; silicon; phosphorus; arsenic; rice; yield foliar Si solution; Si deposition; Si uptake; silicon; phosphorus; arsenic; rice; yield
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Agostinho, F.B.; Tubana, B.S.; Martins, M.S.; Datnoff, L.E. Effect of Different Silicon Sources on Yield and Silicon Uptake of Rice Grown under Varying Phosphorus Rates. Plants 2017, 6, 35.

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