Slag efficacy as a lime and silicon source for rice crops through the biological method

There is little information about the best silicon (Si) sources for agricultural use, and yet some products have already been marketed as sources of this element. One of these products is slag, which is used as a source for Si and lime. This study evaluated the silicon supply availability and effica...

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Bibliographic Details
Published in:Journal of plant nutrition 2010-01, Vol.33 (5-8), p.1103-1111
Main Authors: Sousa, Robson Thiago Xavier de, Korndorfer, Gaspar Henrique
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
calcium
Economic plant physiology
fertilizer rates
Fundamental and applied biological sciences. Psychology
grain yield
greenhouse experimentation
liming
liming materials
magnesium
Metabolism
Metabolism. Physicochemical requirements
nutrient availability
Nutrition. Photosynthesis. Respiration. Metabolism
Oryza sativa
plant growth
Plant physiology and development
Rice
silicon
slag
slags
soil fertility
trace element fertilizers
waste utilization
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Summary:There is little information about the best silicon (Si) sources for agricultural use, and yet some products have already been marketed as sources of this element. One of these products is slag, which is used as a source for Si and lime. This study evaluated the silicon supply availability and efficacy of different silicate slag types for rice crops. The experiment was conducted in a greenhouse, used Entisol Quatzipsamment soil and was set up in randomized blocks with three replications. Si source reactivity was evaluated using five metallurgic slag types and Wollastonite, which is considered a standard in Si studies. Doses of each Si source were 1000 and 2000 mg dm-3 of Si and a control (additional treatment). Soil data [soluble Si, calcium (Ca2+), magnesium (Mg2+) and pH] and rice growth and yield were recorded. Data were evaluated by analysis of variance and contrasts were made for comparisons between each slag type and the additional treatment. Averages were compared by the Scott Knott test at 5% with the statistics program SISVAR. The efficacy of the slag types in supplying Si for the plants (ESSi) and in increasing Si availability in the soil (ESiA) was determined from the values of contrast estimates. Slag E3 and Wollastonite were effective in increasing soil silicon availability and, consequently, the efficacy
ISSN:0190-4167
1532-4087
DOI:10.1080/01904161003763716