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Water and Nutrient Management Influences Allocation and Stabilisation of Assimilated Carbon

Jan 07, 2019

Soil Carbon sequestration can be enhanced via management practices, such as fertilization and water regime.

A researcher group at the Institute of Subtropical Agriculture (ISA) of Chinese Academy of Sciences recently conducted an experiment to investigate the carbon (C) assimilation by rice crop and translocate into paddy soil aggregates. The finding was published in Plant Soil.

Using 13C continues labeling method, their experiment was conducted under two level of P fertilization, 0 and 80 mg P kg-1 soil, and two water regime, alternate wetting and drying (AWD) and continuous flooding (CF).

The results indicated that the recent photoassimilates associated with silt- and clay-size aggregate classes and in the mineral-associated fraction showed highest proportion with P addition and water management.

Lower values of 13C incorporation into soil was found after six, and 14 days from 13C labelling time regardless of water regime.

After 22 days, P fertilization had positive effect on 13C incorporation into different aggregate fraction, and the addition of P fertilizer increased 13C incorporation into macroaggregates, microaggregates and in the silt + clay size class in comparison to no P fertilization.

This study showed that carbon sequestration in paddy can be enhanced by phosphorus application due to increasing of recent photoassimilates contents in soil aggregate classes with longer residence time and also in particulate organic carbon.

Contact

GE Tida

Institute of Subtropical Agriculture

E-mail:

Assimilate allocation by rice and carbon stabilisation in soil: effect of water management and phosphorus fertilisation

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