Abstract
To investigate the combined effect of green manures (GMs) and chemical nitrogen (N) fertilizer on N uptake, growth, and yield of rice, a pot experiment was conducted at the Department of Agronomy, Yezin Agricultural University (YAU). The experiment was conducted from December to June (the summer season) of 2023. The study used a split-plot design with three replications. Chemical N fertilizer was assigned as the main plot factor and different levels of N0%, N25%, N50%, N75%, and N100% were applied based on the N recommended rate (102 kg ha-1) (1.55 g pot-1) of the Sinn-thu-kha rice variety. GM crops were the subplot factor, including no GM (G0), rice bean (GRB), sunn hemp (GSH), and dahincha (GDC). According to the results, N75 and N100 produced the higher dry matter, N uptake, yield, and yield components of rice. The highest growth characters, N uptake, and yield were found in N100 for N levels, GSH for GM levels, and N100GSH as the combined effect. However, similar values were found in the treatment N75GSH. Statistically, the GSH + chemical N treatment produced higher N uptake and yields than those of GRB or GDC + chemical N treatment. When chemical N fertilizers were applied without the use of GMs, the rice yields were lower in comparison to the treatments GMs + N25 or N50 or N75 or N100. In conclusion, combining GSH with either 75% or 100% chemical N resulted in optimal performance for soil nutrient content, growth, N uptake, and rice yield. Additionally, it was observed that the use of chemical N fertilizers was reduced by 25%, which can help mitigate environmental pollution and improve soil health and rice production in the long run.
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Claims 10
Claim · model-written summary
N75 and N100 produced higher rice dry matter, nitrogen uptake and yield components.
- Taxon
- rice
Oryza sativae0 - Treatment
- N75 and N100e0
- Outcome
- dry matter, N uptake, yielde0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N75 and N100 produced the higher dry matter, N uptake, yield, and yield components of rice”
Claim · model-written summary
N100 gave the highest growth, nitrogen uptake and yield among nitrogen levels.
- Treatment
- N100e0
- Outcome
- growth characters, N uptake, and yielde0
- Direction
- higheste0
- Comparator
- N levelse0
Not reportedTaxon
Verbatim
e0“The highest growth characters, N uptake, and yield were found in N100 for N levels”
Claim · model-written summary
Sunn hemp gave the highest growth, nitrogen uptake and yield among green manure levels.
- Treatment
- GSHe0
- Outcome
- growth characters, N uptake, and yielde0
- Direction
- higheste0
- Comparator
- GM levelse0
Not reportedTaxon
Verbatim
e0“The highest growth characters, N uptake, and yield were found in N100 for N levels, GSH for GM levels”
Claim · model-written summary
N100GSH gave the highest growth, nitrogen uptake and yield as a combined treatment.
Not reportedTaxonComparator
Verbatim
e0“The highest growth characters, N uptake, and yield were found in N100 for N levels, GSH for GM levels, and N100GSH as the combined effect”
Claim · model-written summary
N75GSH gave values similar to the highest combined treatment.
Not reportedTaxon
Verbatim
e0“similar values were found in the treatment N75GSH”
e1“N100GSH as the combined effect”
Claim · model-written summary
Sunn hemp plus chemical nitrogen gave higher rice nitrogen uptake than rice bean or dahincha plus nitrogen.
Not reportedTaxon
Verbatim
e0“Statistically, the GSH + chemical N treatment produced higher N uptake and yields than those of GRB or GDC + chemical N treatment”
Claim · model-written summary
Sunn hemp plus chemical nitrogen gave higher rice yields than rice bean or dahincha plus nitrogen.
Not reportedTaxon
Verbatim
e0“Statistically, the GSH + chemical N treatment produced higher N uptake and yields than those of GRB or GDC + chemical N treatment”
Claim · model-written summary
Chemical nitrogen alone produced lower rice yields than green manure plus nitrogen treatments.
- Taxon
- riceOryza sativae0
- Treatment
- chemical N fertilizers were applied without the use of GMse0
- Outcome
- rice yieldse0
- Direction
- lowere0
- Comparator
- GMs + N25 or N50 or N75 or N100e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When chemical N fertilizers were applied without the use of GMs, the rice yields were lower in comparison to the treatments GMs + N25 or N50 or N75 or N100”
Claim · model-written summary
The authors conclude sunn hemp with 75% or 100% nitrogen gave optimal nutrient content, growth, uptake and yield.
- Taxon
- riceOryza sativae0
- Treatment
- GSH with either 75% or 100% chemical Ne0
- Outcome
- growth, N uptake, and rice yielde0
- Direction
- optimale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“combining GSH with either 75% or 100% chemical N resulted in optimal performance for soil nutrient content, growth, N uptake, and rice yield”
Claim · model-written summary
The authors state that green manure use reduced chemical nitrogen fertilizer by 25%.
Not reportedTaxon
Verbatim
e0“the use of chemical N fertilizers was reduced by 25%”
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