Abstract
To improve nitrogen (N) fertilizer management in vineyards and support sustainable production, we conducted field experiments in 2021–2022 to evaluate the effects of reduced N fertilization combined with organic fertilizer (OF) on vine growth, fruit quality, soil fertility, and economic returns in Shine Muscat grapes. Six treatments were established: conventional fertilization (CF), four reduced-N treatments combined with OF (0.9N + OF to 0.6N + OF; i.e., 10–40% N reduction), and a blank control (CK). Yield was significantly increased under 0.8N + OF (18.2% in 2021; 96.0% in 2022) and 0.7N + OF (10.8% in 2021; 47.9% in 2022), with 0.8N + OF also delivering the highest economic returns. Fruit quality analysis showed that 0.8N + OF consistently increased total sugar and the sugar–acid ratio, and improved vitamin C content. Substitution ratios >40% led to a decline in economic benefits. Path analysis indicated that vertical diameter and single-berry weight exerted significant positive effects on total yield. OF substitution also improved fruit quality. Soil available nutrients (N, P, and K) and organic matter were primary factors influencing yield; potassium was the key factor regulating sugar accumulation, with the strongest effect on improving flavor coordination. Reducing N by 20–30% combined with OF (particularly the 0.8N + OF treatment) synergistically enhanced photosynthetic efficiency, N utilization, yield and quality, and soil fertility, representing the optimal fertilization strategy.
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Claims 15
Claim · model-written summary
0.8N + OF increased yield by 18.2% in 2021.
- Taxon
- grapese1
- Material
- Shine Muscate1
- Treatment
- 0.8N + OFe0
- Outcome
- Yielde0
- Direction
- increasede0
- Value
- 18.2%e0
- Qualifier
- 2021e0
Not reportedComparator
Verbatim
e0“Yield was significantly increased under 0.8N + OF (18.2% in 2021; 96.0% in 2022)”
e1“Shine Muscat grapes”
Claim · model-written summary
0.8N + OF increased yield by 96.0% in 2022.
Not reportedComparator
Verbatim
e0“Yield was significantly increased under 0.8N + OF (18.2% in 2021; 96.0% in 2022)”
e1“Shine Muscat grapes”
Claim · model-written summary
0.7N + OF increased yield by 10.8% in 2021.
Not reportedComparator
Verbatim
e0“0.7N + OF (10.8% in 2021; 47.9% in 2022)”
e1“Yield was significantly increased under”
e2“Shine Muscat grapes”
Claim · model-written summary
0.7N + OF increased yield by 47.9% in 2022.
Not reportedComparator
Verbatim
e0“0.7N + OF (10.8% in 2021; 47.9% in 2022)”
e1“Yield was significantly increased under”
e2“Shine Muscat grapes”
Claim · model-written summary
0.8N + OF gave the highest economic returns.
Not reportedComparator
Verbatim
e0“0.8N + OF also delivering the highest economic returns”
e1“Shine Muscat grapes”
Claim · model-written summary
0.8N + OF increased total sugar and sugar–acid ratio.
Not reportedComparator
Verbatim
e0“0.8N + OF consistently increased total sugar and the sugar–acid ratio”
e1“Shine Muscat grapes”
Claim · model-written summary
0.8N + OF improved vitamin C content.
Not reportedComparator
Verbatim
e0“0.8N + OF consistently increased total sugar and the sugar–acid ratio, and improved vitamin C content”
e1“Shine Muscat grapes”
Claim · model-written summary
Substitution ratios above 40% reduced economic benefits.
Not reportedComparator
Verbatim
e0“Substitution ratios >40% led to a decline in economic benefits”
e1“Shine Muscat grapes”
Claim · model-written summary
Berry vertical diameter positively affected total yield.
Verbatim
e0“vertical diameter and single-berry weight exerted significant positive effects on total yield”
e1“Shine Muscat grapes”
Claim · model-written summary
Single-berry weight positively affected total yield.
Verbatim
e0“single-berry weight exerted significant positive effects on total yield”
e1“Shine Muscat grapes”
Claim · model-written summary
Organic fertilizer substitution improved fruit quality.
Not reportedComparator
Verbatim
e0“OF substitution also improved fruit quality”
e1“Shine Muscat grapes”
Claim · model-written summary
Soil available nutrients and organic matter were primary yield factors.
- Taxon
- grapese1
- Outcome
- yielde0
- Qualifier
- available nutrients (N, P, and K) and organic mattere0
- Setting
- Soile0
Not reportedDirection
Verbatim
e0“Soil available nutrients (N, P, and K) and organic matter were primary factors influencing yield”
e1“Shine Muscat grapes”
Claim · model-written summary
Potassium was the key factor regulating sugar accumulation and flavor coordination.
Verbatim
e0“potassium was the key factor regulating sugar accumulation, with the strongest effect on improving flavor coordination”
e1“Shine Muscat grapes”
Claim · model-written summary
Reducing nitrogen by 20–30% with OF enhanced photosynthetic efficiency, nitrogen utilization, yield, quality, and soil fertility.
- Taxon
- grapese1
- Treatment
- Reducing N by 20–30% combined with OFe0
- Outcome
- photosynthetic efficiency, N utilization, yield and quality, and soil fertilitye0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“Reducing N by 20–30% combined with OF (particularly the 0.8N + OF treatment) synergistically enhanced photosynthetic efficiency, N utilization, yield and quality, and soil fertility”
e1“Shine Muscat grapes”
Claim · model-written summary
The authors identify 20–30% nitrogen reduction with organic fertilizer as the optimal fertilization strategy.
Verbatim
e0“Reducing N by 20–30% combined with OF (particularly the 0.8N + OF treatment) synergistically enhanced photosynthetic efficiency, N utilization, yield and quality, and soil fertility, representing the optimal fertilization strategy”
e1“Shine Muscat grapes”
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