Abstract
The experiment was conducted at the Wetland Farm of SRM College of Agricultural Sciences, Chengalpattu, during the navarai season of 2025 to evaluate the effects of biostimulants and nano urea on nutrient uptake efficiency and yield productivity in transplanted rice. The study was laid out in a randomised block design (RBD) comprising 8 treatments. Conventional fertiliser application was combined with foliar sprays of nano urea, potassium humate, humic acid and iron chelate. The treatments significantly influenced growth parameters such as plant height, tiller number, dry matter accumulation, leaf area index (LAI) and chlorophyll index. Among the treatments, T₇ (N₇₅P₁₀₀K₁₀₀ + 1.5 % nano urea + 3 % potassium humate) consistently recorded superior vegetative growth, exhibiting the highest plant height, LAI, chlorophyll index and dry matter production. Yield attributes, including productive tillers per hill, panicle length, panicle weight, test weight and number of filled grains per panicle, were also highest under T₇, followed by the humic acid treatment. Treatment T₇ produced the highest grain and straw yields as well as the greatest harvest index, indicating efficient assimilate partitioning and enhanced nitrogen use efficiency. In contrast, iron chelate treatments, although they increased the total number of tillers, frequently resulted in fewer productive tillers and reduced reproductive efficiency. Overall, the findings demonstrate that the combined application of nano urea and biostimulants, particularly potassium humate, is an effective and sustainable strategy for improving nutrient uptake, physiological performance and productivity in transplanted rice. However, the results also highlight the importance of balanced nutrient management and caution against excessive reliance on iron chelate applications.
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Claims 8
Claim · model-written summary
The treatments significantly influenced rice growth traits.
- Taxon
- transplanted ricet0
- Treatment
- The treatmentse0
- Outcome
- plant height, tiller number, dry matter accumulatione0
Not reportedComparatorDirection
Verbatim
e0“The treatments significantly influenced growth parameters such as plant height, tiller number, dry matter accumulation, leaf area index (LAI) and chlorophyll index.”
t0“transplanted rice”
Claim · model-written summary
T₇ produced the highest height, LAI, chlorophyll index and dry matter.
- Taxon
- transplanted ricet0
- Treatment
- T₇ (N₇₅P₁₀₀K₁₀₀ + 1.5 % nano urea + 3 % potassium humate)e0
- Outcome
- plant height, LAI, chlorophyll index and dry matter productione0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“T₇ (N₇₅P₁₀₀K₁₀₀ + 1.5 % nano urea + 3 % potassium humate) consistently recorded superior vegetative growth, exhibiting the highest plant height, LAI, chlorophyll index and dry matter production.”
t0“transplanted rice”
Claim · model-written summary
T₇ gave the highest productive tillers, panicle traits, test weight and filled grains, followed by humic acid.
Verbatim
e0“Yield attributes, including productive tillers per hill, panicle length, panicle weight, test weight and number of filled grains per panicle, were also highest under T₇, followed by the humic acid treatment.”
t0“transplanted rice”
Claim · model-written summary
T₇ gave the highest grain yield, straw yield and harvest index.
- Taxon
- transplanted ricet0
- Treatment
- T₇e0
- Outcome
- grain and straw yields as well as the greatest harvest indexe0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“Treatment T₇ produced the highest grain and straw yields as well as the greatest harvest index”
t0“transplanted rice”
Claim · model-written summary
Iron chelate increased total tiller number.
- Taxon
- transplanted ricet0
- Treatment
- iron chelate treatmentse0
- Outcome
- total number of tillerse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“iron chelate treatments, although they increased the total number of tillers”
t0“transplanted rice”
Claim · model-written summary
Iron chelate often produced fewer productive tillers and lower reproductive efficiency.
- Taxon
- transplanted ricet0
- Treatment
- iron chelate treatmentse0
- Outcome
- productive tillers and reduced reproductive efficiencye0
- Direction
- fewere0
Not reportedComparator
Verbatim
e0“iron chelate treatments, although they increased the total number of tillers, frequently resulted in fewer productive tillers and reduced reproductive efficiency.”
t0“transplanted rice”
Claim · model-written summary
The authors recommend combined nano urea and biostimulants, especially potassium humate, for rice productivity.
Verbatim
e0“the combined application of nano urea and biostimulants, particularly potassium humate, is an effective and sustainable strategy for improving nutrient uptake, physiological performance and productivity in transplanted rice.”
Claim · model-written summary
The authors advise balanced nutrient management and caution with excessive iron chelate.
Verbatim
e0“the importance of balanced nutrient management and caution against excessive reliance on iron chelate applications.”
t0“transplanted rice”
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