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Copy link Polysulphate Pomegranate Trial in China
82
Heyin, Henan Province, China 2016
82
Key Conclusions
Polysulphate significantly increased the number of fruits per tree, fruit weight and fruit size. The resulting increase in yield is more significant in younger trees, with increases of 82.4%, 55.2%, and 30.5% for 10-, 15-, and 20-year-old-trees, respectively.
The net income also increased significantly by 148.29%, 84.42% and 47.61% for 10-, 15-, and 20-year-old trees respectively.
Objective
To compare the yield and quality of pomegranate (Punica granatum) fruit grown in Henan Province, China using farmers’ fertilizer practice, or fertilizer schemes based on soil tests, and either with or without the addition of Polysulphate.
Trial Details
Trial station
Heyin, Henan Province, China
Product
Standard Polysulphate
Assessments
Yield, number of fruits per tree, fruit weight, and fruit quality
Treatments
The trial tested the effect of 3 different fertilizer treatments on pomegranate trees of either 10, 15, or 20 years old. There were 3 replications for each treatment.
- FFP (farmer’s fertilizer practice): base fertilizer in autumn: 7,500 kg/ha organic fertilizer; topdressing fertilizer in spring: 500 kg/ha N, 500 kg/ha P2O5 and 500 kg/ha K2O.
- STFF (soil testing and formula fertilization): base fertilizer in autumn: 7,500 kg/ha organic fertilizer; topdressing fertilizer in spring: 373.5 kg/ha N, 223.5 kg/ha P2O5 and 327 kg/ha K2O.
- STFF+PS (soil testing and formula fertilization + Polysulphate): base fertilizer in autumn: 7,500 kg/ha organic fertilizer and 375 kg/ha Polysulphate; topdressing fertilizer in spring: 373.5 kg/ha N, 223.5 kg/ha P2O5 and 327 kg/ha K2O.
Treatments
The trial tested the effect of 3 different fertilizer treatments on pomegranate trees of either 10, 15, or 20 years old. There were 3 replications for each treatment.
- FFP (farmer’s fertilizer practice): base fertilizer in autumn: 7,500 kg/ha organic fertilizer; topdressing fertilizer in spring: 500 kg/ha N, 500 kg/ha P2O5 and 500 kg/ha K2O.
- STFF (soil testing and formula fertilization): base fertilizer in autumn: 7,500 kg/ha organic fertilizer; topdressing fertilizer in spring: 373.5 kg/ha N, 223.5 kg/ha P2O5 and 327 kg/ha K2O.
- STFF+PS (soil testing and formula fertilization + Polysulphate): base fertilizer in autumn: 7,500 kg/ha organic fertilizer and 375 kg/ha Polysulphate; topdressing fertilizer in spring: 373.5 kg/ha N, 223.5 kg/ha P2O5 and 327 kg/ha K2O.
Results
- Compared with farmers’ fertilizer practice, using soil testing and formula fertilizers with Polysulphate significantly increased fruit yield for pomegranate trees of all ages. The yield increase is less significant as tree age increases, 82.4% (10 years), 55.2% (15 years), and 30.5% (20 years).
- Polysulphate significantly increased the number of fruits per tree, fruit weight and fruit size.
- Polysulphate significantly increased sugar content, sugar-acid ratio, and vitamin C content, while decreasing acidity of the fruits.
- Compared with farmers’ fertilizer practice, using soil testing and formula fertilizers with Polysulphate for pomegranate trees increased farmers’ net income by 148.29%, 84.42% and 47.61% for 10-, 15-, and 20-year-old trees respectively.
| Tree-age | Treatment | Diameter | Sugar content | Acidity | Sugar:acid ratio | Vitamin C content |
|---|---|---|---|---|---|---|
| years | cm | % | % | mg/kg | ||
| 10 | FFP | 8.40 b | 14.91 b | 0.28 a | 53.14 b | 5.72 b |
| STFF | 8.84 a | 15.10 ab | 0.16 b | 92.26 a | 7.29 a | |
| STFF+PS | 8.70 a | 15.77 a | 0.16 b | 96.36 a | 7.41 a | |
| 15 | FFP | 8.11 b | 14.26 b | 0.23 a | 60.99 b | 6.70 b |
| STFF | 8.34 ab | 14.97 ab | 0.19 ab | 80.03 a | 7.99 a | |
| STFF+PS | 8.57 a | 15.03 a | 0.17 b | 88.44 a | 7.88 a | |
| 20 | FFP | 8.35 b | 14.73 a | 0.28 a | 52.50 b | 5.79 b |
| STFF | 8.67 a | 14.66 a | 0.18 b | 81.50 a | 7.85 a | |
| STFF+PS | 8.58 ab | 15.09 a | 0.21 b | 72.76 a | 7.92 a |
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