Abstract
Fertilizer regimes have profound effects on crop yield, soil fertility, and microbial community structure. However, the impacts of partially substituting mineral nitrogen (N) with organic N and/or controlled-release mineral N and combining with micronutrient fertilizers on soil properties and microbial communities are still unclear in double-rice systems. The objective of this study was to compare rice yield, soil nutrient condition, and bacterial alpha and beta diversity in paddy soil that had been subjected to four fertilizer treatments from 2012 to 2016. The treatments were FP: farmers’ practice with 100% urea N; T1: 64% urea N + 16% manure N; T2: T1 + micronutrient fertilizers; and T3: 40% urea N + 24% controlled-release N + 16% manure N + micronutrient fertilizers. The results showed that there were no considerable differences between rice yields under fertilizer treatments, meaning that reducing farmers’ practice N by 20% did not decrease rice yield. Soil organic matter, total N, pH, and microbial biomass receiving manure did not increase significantly compared with FP. Bacterial beta diversities did not alter under the four treatments. Only two (Verrucomicrobia and Aminicenantes) out of eleven dominant phyla considerably varied under manure treatments. These results indicate that 20% reduction and partial substitution of mineral fertilizer with manure can maintain double-rice yield in paddy soil with limited effects on soil properties and bacterial community structure.
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Claims 7
Claim · model-written summary
Rice yield did not differ considerably among fertilizer regimes.
- Taxon
- rice
Oryza sativae0 - Treatment
- fertilizer treatmentse0
- Outcome
- rice yieldse0
- Direction
- no considerable differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no considerable differences between rice yields under fertilizer treatments”
Claim · model-written summary
A 20% reduction in farmer-practice nitrogen did not reduce rice yield.
- Taxon
- riceOryza sativae0
- Treatment
- reducing farmers’ practice N by 20%e0
- Outcome
- rice yielde0
- Direction
- did not decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reducing farmers’ practice N by 20% did not decrease rice yield”
Claim · model-written summary
Manure did not significantly increase soil organic matter, total N and pH versus FP.
Not reportedTaxon
Verbatim
e0“Soil organic matter, total N, pH, and microbial biomass receiving manure did not increase significantly compared with FP”
Claim · model-written summary
Manure did not significantly increase soil microbial biomass versus FP.
Not reportedTaxon
Verbatim
e0“Soil organic matter, total N, pH, and microbial biomass receiving manure did not increase significantly compared with FP”
Claim · model-written summary
Bacterial beta diversity did not change across four fertilizer treatments.
Not reportedTaxonComparator
Verbatim
e0“Bacterial beta diversities did not alter under the four treatments”
Claim · model-written summary
Verrucomicrobia abundance varied under manure treatment.
- Treatment
- manure treatmentse0
- Interactor
- VerrucomicrobiaVerrucomicrobiotae0other
- Outcome
- Verrucomicrobiae0
Not reportedTaxonComparatorDirection
Verbatim
e0“Only two (Verrucomicrobia and Aminicenantes) out of eleven dominant phyla considerably varied under manure treatments”
Claim · model-written summary
Aminicenantes abundance varied under manure treatment.
Not reportedTaxonComparatorDirection
Verbatim
e0“Only two (Verrucomicrobia and Aminicenantes) out of eleven dominant phyla considerably varied under manure treatments”
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