Agro Fossil Free - Kontrasterende virkninger af halm og halm-afledte biochar-anvendelser på jordens kulstofakkumulering og effektiviteten af nitrogenbrug i dobbelt-risdyrkningssystemer

General beskrivelse

Increasing cropland soil carbon (C) sequestration and improving crop nitrogen use efficiency (NUE) are vital for sustainable agriculture and environmental protection. The incorporation of straw and application of straw-derived biochar to croplands may help to achieve these goals; however, the long-term effects on soil C sequestration and NUE in double-rice cropping systems are poorly understood. Here, a 6-y field experiment was conducted in a double-rice cropping system to investigate the variations in soil C sequestration and NUE with straw and straw-derived biochar amendments. The treatments were as follows: control with zero nitrogen (N0); conventional chemical fertilizer application (NPK); NPK plus 3 t rice straw dry matter (DM) incorporated per ha−1 season−1 (NPK + LS); NPK plus 6 t rice straw DM incorporated per ha−1 season−1 (NPK + HS); NPK plus 24 t straw-derived biochar DM incorporated per ha−1 (NPK + LC) applied once; and NPK plus 48 t straw-derived biochar DM incorporated per ha−1 (NPK + HC) applied once. Both the straw and biochar additions increased the soil C content in the topsoil, and the NPK + LC treatment sequestered 2.6-fold more soil C than the NPK + HS treatment over the 6-y period, when the input amounts of straw as well as the straw derived C were similar for both treatments. Besides input C directly into the fields, biochar application also increased soil original organic C accumulation in the NPK + LC treatment. Compared with NPK, 50 % and 100 % straw incorporation to the field increased the mean NUE by 22.3 % and 39.8 %, respectively, in the late rice season of 4–6 y, mainly due to increasing soil organic C. Rice grain yields decreased in the early rice season for the first 3 y of the straw treatments but increased in the first season when the biochar was applied, when compared with NPK. However, in the second 3 y after straw application, the grain yield of NPK + HS was significantly higher than that of NPK in late rice season. This investigation has indicated that biochar application had a higher potential in soil carbon sequestration than straw incorporation, and long-term (> 3 y) straw incorporation favored for the enhancement of NUE in paddy fields.

Kontrasterende virkninger af halm og halm-afledte biochar-anvendelser på jordens kulstofakkumulering og effektiviteten af nitrogenbrug i dobbelt-risdyrkningssystemer

Information
Udbyder/kilde
Materiale
Vurdering

FEFTS specifikationer

Videnskabeligt papir

Til Kulstofbinding i jorden

Særlig praksis

Jordens organiske stof

Speciel type

Affald fra høst

Landbrugsdomæne

Jordbrug

Egnet til

Landmand, Producentforeningen

Ansøgninger

Landbrugspraksis

Især

Gødskning

Løsnings type

Metode, Procedure

This is a toast

Kontrasterende virkninger af halm og halm-afledte biochar-anvendelser på jordens kulstofakkumulering og effektiviteten af nitrogenbrug i dobbelt-risdyrkningssystemer

FEFTS specifikationer

Videnskabeligt papir

Særlig praksis

Speciel type

Landbrugsdomæne

Egnet til

Ansøgninger

Især

Løsnings type

Detaljer

Relevante filer og videoer

Vurdering

Generelt

Miljømæssigt

Socioøkonomisk

This is a toast

Kontrasterende virkninger af halm og halm-afledte biochar-anvendelser på jordens kulstofakkumulering og effektiviteten af ​​nitrogenbrug i dobbelt-risdyrkningssystemer

FEFTS specifikationer

Videnskabeligt papir

Særlig praksis

Speciel type

Landbrugsdomæne

Egnet til

Ansøgninger

Især

Løsnings type

Detaljer

Relevante filer og videoer

Vurdering

Generelt

Miljømæssigt

Socioøkonomisk

Kontrasterende virkninger af halm og halm-afledte biochar-anvendelser på jordens kulstofakkumulering og effektiviteten af nitrogenbrug i dobbelt-risdyrkningssystemer