Abstract
Building a nutrient channel between eutrophic water and agricultural fields could reduce nutrient input into fields and alleviate eutrophication by returning nitrogen. In order to determine the feasibility of returning nitrogen by biochar loading, a rhizobox experiment was conducted with two nitrogen applied methods, namely SN (applied nitrogen by nitrogen fertilizer solution) and BN (applied nitrogen by nitrogen-loaded biochar). The results showed that BN, in comparison with SN, decreased the biomass and nitrogen uptake of the aboveground paddy by 16% and 14%, respectively, increased biomass root-shoot ratios by 25%-27%, and reduced nitrogen recovery use efficiency. Two nitrogen application methods affected the length and volume of paddy adventitious roots. Paddy underground biomass and nitrogen uptake were positively correlated with soil ammonium content, whereas paddy aboveground nitrogen uptake was negatively correlated with root tips. It was suggested that the paddy biomass and nitrogen uptake would be influenced when nitrogen was applied solely by nitrogen-loaded biochar. However, no affinity and no significance in nitrogen use efficiency were found for plant uptake between chemical nitrogen and biochar-loaded nitrogen. Additionally, biochar promoted soil mineral nitrogen content for further plant uptake. Therefore, biochar could be used as the carrier for returning nitrogen from waterbodies to fields. The replacement rate of chemical nitrogen fertilizer is the key to influencing plant growth and needs future study.
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Claims 11
Claim · model-written summary
Biochar-loaded nitrogen decreased aboveground paddy biomass by 16% versus nitrogen solution.
Verbatim
e0“BN, in comparison with SN, decreased the biomass and nitrogen uptake of the aboveground paddy by 16% and 14%, respectively”
Claim · model-written summary
Biochar-loaded nitrogen decreased aboveground paddy nitrogen uptake by 14% versus nitrogen solution.
Verbatim
e0“BN, in comparison with SN, decreased the biomass and nitrogen uptake of the aboveground paddy by 16% and 14%, respectively”
Claim · model-written summary
Biochar-loaded nitrogen increased paddy root-shoot biomass ratios by 25%-27%.
- Taxon
- paddyt0
- Treatment
- Biochar Loadingt0
- Outcome
- biomass root-shoot ratiose0
- Direction
- increasede0
- Value
- 25%-27%e0
Not reportedComparator
Verbatim
e0“increased biomass root-shoot ratios by 25%-27%”
t0“Effects of Returning Nitrogen by Biochar Loading on Paddy Growth”
Claim · model-written summary
Biochar-loaded nitrogen reduced nitrogen recovery use efficiency.
Not reportedComparator
Verbatim
e0“reduced nitrogen recovery use efficiency”
t0“Biochar Loading on Paddy Growth”
Claim · model-written summary
The two nitrogen application methods affected paddy adventitious root length and volume.
- Taxon
- paddye0
- Treatment
- Two nitrogen application methodse0
- Outcome
- length and volume of paddy adventitious rootse0
Not reportedComparatorDirection
Verbatim
e0“Two nitrogen application methods affected the length and volume of paddy adventitious roots”
Claim · model-written summary
Paddy underground biomass correlated positively with soil ammonium content.
Verbatim
e0“Paddy underground biomass and nitrogen uptake were positively correlated with soil ammonium content”
Claim · model-written summary
Paddy underground nitrogen uptake correlated positively with soil ammonium content.
Verbatim
e0“Paddy underground biomass and nitrogen uptake were positively correlated with soil ammonium content”
Claim · model-written summary
Aboveground paddy nitrogen uptake correlated negatively with root tips.
Verbatim
e0“paddy aboveground nitrogen uptake was negatively correlated with root tips”
Claim · model-written summary
Plant uptake nitrogen use efficiency did not differ significantly between chemical and biochar-loaded nitrogen.
Verbatim
e0“no significance in nitrogen use efficiency were found for plant uptake between chemical nitrogen and biochar-loaded nitrogen”
t0“Paddy Growth”
Claim · model-written summary
Biochar promoted soil mineral nitrogen content for plant uptake.
Not reportedComparator
Verbatim
e0“biochar promoted soil mineral nitrogen content for further plant uptake”
Claim · model-written summary
The authors recommend biochar as a carrier to return nitrogen from waterbodies to fields.
Verbatim
e0“biochar could be used as the carrier for returning nitrogen from waterbodies to fields”
t0“Paddy Growth”
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