Effect of calcium silicate on nutrient use of lowland rice and greenhouse gas emission from a paddy soil under alternating wetting and drying

In intensively irrigated rice cultivation, plant-available silicon (Si) is a crucial nutrient for improving rice productivity. As a source of Si, calcium silicate (CaSiO3) was amended to evaluate the effect of silicate fertilizer on rice production, nitrogen (N) use efficiency, and greenhouse gas (G...

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Bibliographic Details
Published in:Pedosphere 2020-08, Vol.30 (4), p.535-543
Main Authors: KU, Hyun-Hwoi, HAYASHI, Keiichi, AGBISIT, Ruth, VILLEGAS-PANGGA, Gina
Format: Article
Language:English
Subjects:
Agricultural production
Calcium
Calcium silicates
CH4 emission
Climate change
Crop yield
Cultivation
Drying
Efficiency
Emission analysis
Emissions control
Fertilizers
Global warming
Grain
Grain cultivation
Greenhouse effect
Greenhouse gases
Hydroxyapatite
Methane
N use efficiency
N2O emission
Nitrogen
Nitrous oxide
Nutrient availability
Nutrients
plant-available Si
Rice
Rice fields
rice straw biomass
silicate fertilizer
Silicon
Soils
Straw
Tropical environments
tropical soil
Tropical soils
Wetting
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Summary:In intensively irrigated rice cultivation, plant-available silicon (Si) is a crucial nutrient for improving rice productivity. As a source of Si, calcium silicate (CaSiO3) was amended to evaluate the effect of silicate fertilizer on rice production, nitrogen (N) use efficiency, and greenhouse gas (GHG) emission under alternating wetting and drying in a pot experiment using a tropical soil from a paddy field of the International Rice Research Institute (IRRI) in the Philippines. Four levels of CaSiO3 amendment, 0, 112.7, 224.5, and 445.8 kg ha–1, with the recommended N rate were tested. The results showed that although CaSiO3 amendment of 112.7 kg ha–1 resulted in higher rice straw, improved N use efficiency, and reduced N2O emission, there was no difference in grain yield among the four levels of CaSiO3 amendment owing to relatively lower harvest index. Moreover, CaSiO3 amendment showed a reverse trend between CH4 and N2O emissions as it reduced N2O emission while led to significantly increased CH4 emission and global warming potential. Thus, CaSiO3 amendment was a possible alternative to improve N use efficiency and increase rice straw biomass, but it needs to be reviewed in line with grain yield production and GHG emission. It is also imperative to test an optimal method of silicate fertilizer amendment in future research in order to compromise a negative impact in tropical soils.
ISSN:1002-0160
2210-5107
DOI:10.1016/S1002-0160(17)60401-6