Abstract
A novel biostimulant, Paecilomyces variotii extracts (ZNC), with the ability to promote N absorption in the plant at a very low level has been proved in the lab experiment, but its chemical composition and practical effect in the field remain unclear. In this work, we determined the molecular composition of ZNC. Then, a three-year field experiment was conducted to investigate the synergistic effects of controlled-release urea (CRU) without ZNC or with ZNC at three doses (87.5, 175, and 262.5 mL ha–1) on the yield, nitrogen use efficiency (NUE), and net returns of rice. Results indicated that ZNC contained more carbohydrates, amino acids, alkyl structures, and less aromatic structures with a molecular weight between 140 and 2507 Da. Rice yield was 6.9–21.0% higher with CRU than with conventional urea. Combining CRU with ZNC at a dose of 87.5 mL ha–1 performed the best and significantly increased rice yields by 8.7–12.1%, NUE by 15.0–20.2%, and average net returns by 10.9–15.4% during three rice-growing seasons compared to the application of CRU only, which is attributed to the positively increasing panicles and N uptake of rice. With the increased dose of ZNC, the yield of rice showed a decreasing trend, but the yield was still higher/not significant than the CFF treatment without ZNC. Therefore, the planting patterns with the combination of CRU and biostimulant are an efficient way to increase the rice grain yield and net returns.
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Claims 4
Claim · model-written summary
CRU increased rice yield 6.9–21.0% over conventional urea.
- Taxon
- Rice
Oryza sativae0 - Treatment
- CRUe0
- Outcome
- Rice yielde0
- Direction
- highere0
- Value
- 6.9–21.0%e0
- Comparator
- conventional ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yield was 6.9–21.0% higher with CRU than with conventional urea.”
Claim · model-written summary
CRU with 87.5 mL ha–1 ZNC increased rice yield 8.7–12.1% over CRU alone.
- Taxon
- riceOryza sativae0
- Treatment
- CRU with ZNC at a dose of 87.5 mL ha–1e0
- Outcome
- rice yieldse0
- Direction
- increasede0
- Value
- 8.7–12.1%e0
- Comparator
- CRU onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combining CRU with ZNC at a dose of 87.5 mL ha–1 performed the best and significantly increased rice yields by 8.7–12.1%, NUE by 15.0–20.2%, and average net returns by 10.9–15.4% during three rice-growing seasons compared to the application of CRU only”
Claim · model-written summary
CRU with ZNC increased NUE 15.0–20.2%.
- Taxon
- riceOryza sativae0
- Treatment
- CRU with ZNC at a dose of 87.5 mL ha–1e0
- Outcome
- NUEe0
- Direction
- increasede0
- Value
- 15.0–20.2%e0
- Comparator
- CRU onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combining CRU with ZNC at a dose of 87.5 mL ha–1 performed the best and significantly increased rice yields by 8.7–12.1%, NUE by 15.0–20.2%, and average net returns by 10.9–15.4% during three rice-growing seasons compared to the application of CRU only”
Claim · model-written summary
CRU with ZNC increased average net returns 10.9–15.4%.
- Taxon
- riceOryza sativae0
- Treatment
- CRU with ZNC at a dose of 87.5 mL ha–1e0
- Outcome
- average net returnse0
- Direction
- increasede0
- Value
- 10.9–15.4%e0
- Comparator
- CRU onlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combining CRU with ZNC at a dose of 87.5 mL ha–1 performed the best and significantly increased rice yields by 8.7–12.1%, NUE by 15.0–20.2%, and average net returns by 10.9–15.4% during three rice-growing seasons compared to the application of CRU only”
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