Abstract
Aims: To investigate the effects of green manures (GMs) combined with inorganic nitrogen (N) fertilizer on N use efficiency, and the yield of Sinn-thu-kha rice, as well as on soil nutrient contents, field experiments were conducted at the Department of Agronomy, Yezin Agricultural University from December to June during the summer and monsoon seasons of 2023 and 2024. Study Design and Methodology: The study employed a split-plot design with three replications. Different rates of inorganic N fertilizer were assigned as the main plot factor, including N0%, N25%, N50%, N75%, and N100%, based on the recommended N rate of 102 kg ha-1. GM crops served as the subplot factor, which included no GM (G0), rice bean (GRB), sunn hemp (GSH), and dahincha (GDC). GMs were cultivated and incorporated into the soil at the time of flowering, followed by rice cultivation. Results: The results indicated that the N100% yielded the highest dry matter, N uptake, N use efficiency, and rice yield. Among the GM treatments, GSH performed the best. The combination of GSH with N100% achieved the highest N use efficiency and rice yield. Similarly, GSH combined with N75% resulted in greater dry matter, higher N uptake, N use efficiency, and yields compared to GRB or GDC combined with N75%, N100%, or the inorganic N treatment alone. Over two years, soil nutrient contents such as total N (%), available phosphorus (ppm), available potassium (ppm), and organic carbon (%) all increased. Conclusion: Green manure enhances the N use efficiency of rice and improves the nutrient content of paddy soil. With either 75% or 100% of the recommended inorganic N, sunn hemp (GSH) promotes soil nutrient content, dry matter production, N uptake, N use efficiency, and rice yield. This combination allows for a reduction of 25% in inorganic N fertilizer without compromising rice yield. Consequently, this practice can help lower fertilizer costs, reduce environmental pollution, and promote both soil health and long-term rice production.
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Claims 7
Claim · model-written summary
N100% had the highest dry matter, N uptake and N use efficiency.
- Taxon
- rice
Oryza sativae0 - Treatment
- N100%e0
- Outcome
- dry matter, N uptake, N use efficiencye0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N100% yielded the highest dry matter, N uptake, N use efficiency, and rice yield.”
Claim · model-written summary
N100% had the highest rice yield.
- Taxon
- riceOryza sativae0
- Treatment
- N100%e0
- Outcome
- rice yielde0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N100% yielded the highest dry matter, N uptake, N use efficiency, and rice yield.”
Claim · model-written summary
GSH performed best among green manure treatments.
Not reportedTaxon
Verbatim
e0“Among the GM treatments, GSH performed the best.”
Claim · model-written summary
GSH with N100% achieved the highest N use efficiency and rice yield.
Not reportedTaxonComparator
Verbatim
e0“The combination of GSH with N100% achieved the highest N use efficiency and rice yield.”
Claim · model-written summary
GSH with N75% produced greater dry matter and higher N uptake, N use efficiency and yields than alternative N75% and N100% combinations or inorganic nitrogen alone.
- Treatment
- GSH combined with N75%e0
- Outcome
- dry matter, higher N uptake, N use efficiency, and yieldse0
- Direction
- highere0
- Comparator
- GRB or GDC combined with N75%, N100%, or the inorganic N treatment alonee0
Not reportedTaxon
Verbatim
e0“GSH combined with N75% resulted in greater dry matter, higher N uptake, N use efficiency, and yields compared to GRB or GDC combined with N75%, N100%, or the inorganic N treatment alone.”
Claim · model-written summary
Total N, available phosphorus and potassium, and organic carbon in soil increased over two years.
- Taxon
- riceOryza sativae1
- Outcome
- soil nutrient contentse0
- Direction
- increasede0
- Qualifier
- Over two yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over two years, soil nutrient contents such as total N (%), available phosphorus (ppm), available potassium (ppm), and organic carbon (%) all increased.”
e1“N100% yielded the highest dry matter, N uptake, N use efficiency, and rice yield.”
Claim · model-written summary
The authors conclude that GSH with 75% recommended N can reduce inorganic fertilizer by 25% without compromising rice yield.
Not reportedTaxon
Verbatim
e0“This combination allows for a reduction of 25% in inorganic N fertilizer without compromising rice yield.”
The same questions in other papers
glutathione · yield · Oryza sativa (rice)Results agree
1 paper in the same direction as this paper
- 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.