Effects of deep placement of fertilizer on periphytic biofilm development and nitrogen cycling in paddy systems

doi:10.1016/S1002-0160(20)60051-0

Pedosphere

Volume 31, Issue 1, February 2021, Pages 125-133

https://doi.org/10.1016/S1002-0160(20)60051-0 Get rights and content

ABSTRACT

Periphytic biofilms are commonly presented at the water-soil interface in paddy fields. Different fertilization methods can affect the concentration and distribution of nutrients in paddy fields and thus affect the development of periphytic biofilms. In this study, the roles of periphytic biofilms in nitrogen (N) cycling in paddy systems and how they are affected by different fertilization methods were studied using microcosm experiments. Microcosms were prepared using soil samples from a paddy field and treated with surface and deep fertilization under light and dark conditions. Surface fertilization under light condition promoted the development of periphytic biofilms, while deep fertilization under dark condition inhibited their development. The development of periphytic biofilms increased the pH and dissolved oxygen levels in the overlying water. Surface fertilization resulted in high N concentrations in the overlying water and the topsoil layers, which enhanced NH₃ volatilization and nitrification-denitrification but inhibited N fixation. The development of periphytic biofilms reduced NH₃ volatilization loss but increased nitrification-denitrification loss and the overall N loss in the paddy system. The results from this work suggest that the presence of periphytic biofilms in paddy fields could increase N loss by 3.10%–7.11%. Deep fertilization is an effective method to retard the development of periphytic biofilms in the paddy system and can potentially increase the overall N use efficiency.

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Effects of deep placement of fertilizer on periphytic biofilm development and nitrogen cycling in paddy systems

ABSTRACT

Field Crops Res

Field Crops Res

Field Crops Res

Adv Agron

Soil Biol Biochem

J Environ Sci

Soil Biol Biochem

Bioresour Technol

Field Crops Res

Pedosphere

Bioresour Technol

Agric Ecosyst Environ

Effects of overlying velocity on periphyton structure and denitrification

J Geophys Res Biogeosci

Effect of fertilizer deep placement with urea supergranule on nitrogen use efficiency of irrigated rice in Sourou Valley (Burkina Faso)

Nutr Cycl Agroecosys

Distribution of nitrogen-fixing cyanobacteria (Nostocaceae) during rice cultivation in fertilized and unfertilized paddy fields

Nord J Bot

Influence of urea and ammonium sulfate on soil acidity indices in lowland rice production

Commun Soil Sci Plant Anal

Nitrous oxide and nitric oxide emissions and nitrogen use efficiency as affected by nitrogen placement in lowland rice fields

Nutr Cycl Agroecosys

Effect of long-term application of inorganic fertilizer and organic amendments on soil organic matter and microbial biomass in three subtropical paddy soils

Nutr Cycl Agroecosys