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Copy link Polysulphate Honey Pomelo Trial in China
6.9
Yield Increase
Application of Polysulphate to 5 year-old honey pomelo trees resulted in lower fertilizer costs, increased fruit yield and better quality fruit.
Fujian, China 2017
6.9
Key Conclusions
Polysulphate application increased honey pomelo yield by 6.9% while also improving the quality parameters, especially the fresh weight per fruit, flesh weight and fruit diameter.
Objective
To investigate the effect of Polysulphate on the yield, quality parameters, and spring shoot parameters of honey pomelo (Citrus maxima).
Trial Details
Trial station
Fujian, China
Product
Granular Polysulphate
Assessments
Yield, fruit quality parameters, and spring shoot parameters
Treatments
This trial consisted of 3 treatments with 12 plants per treatment. The treatments were:
- Farmers’ practice (pig manure + NPK fertilizer at a total rate of 1,528, 1,016 and 1,246 kg/ha of N, P2O5 and K2O respectively, split into 5 applications),
- Optimized fertilization (organic fertilizer + NPK fertilizer at a total rate of 862, 631, 744, 69 and 49 kg/ha of N, P2O5, K2O, CaO and MgO respectively, split into 4 applications), and
- Optimized fertilization + Polysulphate (organic fertilizer + NPK fertilizer + Polysulphate at a total rate of 862, 631, 1038, 468 and 175 kg/ha of N, P2O5, K2O, CaO and MgO respectively, split into 4 applications).
Treatments
This trial consisted of 3 treatments with 12 plants per treatment. The treatments were:
- Farmers’ practice (pig manure + NPK fertilizer at a total rate of 1,528, 1,016 and 1,246 kg/ha of N, P2O5 and K2O respectively, split into 5 applications),
- Optimized fertilization (organic fertilizer + NPK fertilizer at a total rate of 862, 631, 744, 69 and 49 kg/ha of N, P2O5, K2O, CaO and MgO respectively, split into 4 applications), and
- Optimized fertilization + Polysulphate (organic fertilizer + NPK fertilizer + Polysulphate at a total rate of 862, 631, 1038, 468 and 175 kg/ha of N, P2O5, K2O, CaO and MgO respectively, split into 4 applications).
Results
- Compared with farmers’ practice, Polysulphate application increased the number of spring shoots by 23%, and the biomass of spring shoots by 19.7%.
- Polysulphate application increased the fruit yield by 6.9% when compared to the farmers’ practice, and by 1.2% when compared to the optimized fertilization treatment.
- Polysulphate application increased the quality parameters, especially the fresh weight per fruit, flesh weight, and fruit diameter.
- Compared with farmers’ practice, Polysulphate treatment reduced the N, P and K inputs by 44%, 38% and 17% respectively, thus decreasing fertilizer costs by 11% and increasing farmers’ income by 7% compared to farmers’ practice.
Polysulphate application increases honey pomelo yield by 6.9%.
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