期刊
PLANTS-BASEL
卷 6, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/plants6030035
关键词
foliar Si solution; Si deposition; Si uptake; silicon; phosphorus; arsenic; rice; yield
资金
- USDA-NIFA
- Edward C. Levy Co.
- CAPES Foundation Ministry of Education of Brazil
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.
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