Abstract
Green manuring with an $N_2$-fixing legume crop can meet a substantial portion of rice N requirement and provide organic matter to wetland rice soils to maintain soil fertility. Organic-N fertilizers in the form of flood-tolerant, leguminous, stem-nodulating Sesbania rostrata can be useful alternatives to resource-poor rice farmers if applied as green manure. Therefore, the accumulation of fixed N by this green manure, their effect on the performance and yield of rice was examined. Firstly, root and/or stem nodulation, nitrogen fixation (acetylene-reducing activity), growth and N accumulation of S. rostrata as affected by inoculation site were studied in a pot experiment. The growth and N accumulation of S. rostrata in stem inoculation treatment was the highest. Therefore, stem inoculation method was used for growing S. rostrata to incorporate into the rice soils for the second experiment. In the second experiment, the effects of S. rostrata green manure application on the growth and yield of rice were studied. Green manure treatments (2 and 4 plants $pot^-1$) were compared to urea treatments (40 and 80 kg N $ha^-1$) and no application treatment. Green manure treatments increased dry matter weight and grain weight of rice significantly over urea and no application treatments. All green manure treatments increased N uptake of the plant. It can be concluded that incorporation of green manure legumes can add large amount of biologically fixed N to rice soils. The effective utilization of biomass produced by the stem-nodulating S. rostrata could be an economically viable component of integrated nutrient management for increasing the yield components and yield of rice per unit area.
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Claims 5
Claim · model-written summary
Stem inoculation produced the highest growth and N accumulation of S. rostrata.
- Taxon
- S. rostrataSesbania rostratae0
- Treatment
- stem inoculation treatmente0
- Outcome
- growth and N accumulatione0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“The growth and N accumulation of S. rostrata in stem inoculation treatment was the highest.”
Claim · model-written summary
Green manure significantly increased rice dry matter and grain weight over urea and no application.
- Taxon
- rice
Oryza sativae0 - Treatment
- Green manure treatmentse0
- Outcome
- dry matter weight and grain weighte0
- Direction
- increasede0
- Comparator
- urea and no application treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Green manure treatments increased dry matter weight and grain weight of rice significantly over urea and no application treatments.”
Claim · model-written summary
All green manure treatments increased rice N uptake.
- Taxon
- RiceOryza sativat0
- Treatment
- green manure treatmentse0
- Outcome
- N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All green manure treatments increased N uptake of the plant.”
t0“Rice”
Claim · model-written summary
Incorporating green manure legumes can add substantial biologically fixed N to rice soils.
- Treatment
- incorporation of green manure legumese0
- Outcome
- biologically fixed Ne0
- Direction
- adde0
- Qualifier
- cane0
Not reportedTaxonComparator
Verbatim
e0“incorporation of green manure legumes can add large amount of biologically fixed N to rice soils”
Claim · model-written summary
Using S. rostrata biomass could be economically viable in integrated nutrient management to increase rice yield components and yield.
- Taxon
- riceOryza sativae0
- Outcome
- effective utilization of biomass produced by the stem-nodulating S. rostratae0
- Qualifier
- could be an economically viable componente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effective utilization of biomass produced by the stem-nodulating S. rostrata could be an economically viable component of integrated nutrient management for increasing the yield components and yield of rice per unit area.”
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2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.