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Dry yield increase
Four locations in Ghana 2022
Dry yield increase
Key Conclusions
This study reviewed cocoa trials at 4 locations in Ghana and found that Polysulphate significantly increased the two-year cumulative dry cocoa bean yield at 3 of the 4 locations, generating an average increase in dry bean yield of 13.6% compared with the reference granular fertilizer, or 70.8% compared with the unfertilized control. Based on these results, Polysulphate is considered suitable for mature cocoa plantations at the application rate of 375 kg/ha.
Objective
To investigate the effect Polysulphate has on the yield of mature cocoa trees and to compare it with a comparable granular NPK fertilizer which also contains calcium, magnesium, and sulfur.
Trial Details
Trial station
Four locations in Ghana
Crop
Cocoa
Product
Granular Polysulphate 0-0-14
Assessments
Dry cocoa bean yield
Treatments
The study was conducted by the Cocoa Research Institute of Ghana (CRIG) in 2020/21 and 2021/22 cocoa seasons on farms at 4 locations: Assin Nkukuasa (Central Region), Bechem (Ahafo Region), and Konongo and New Edubiase (Ashanti Region). The trial utilized a randomized complete block design, incorporating 3 treatments and 2 replicates per location. The ages of the mixed hybrid cocoa variety trees ranged from 10 to 15 years.
Treatment 1 was the unfertilized control, treatment 2 was the reference granular fertilizer (NPK 0-22-18+9CaO+9MgO+7S) applied at 375 kg/ha per year, treatment 3 was Polysulphate granular fertilizer applied at 375 kg/ha per year. All recommended agronomic practices were followed.
Treatments
The study was conducted by the Cocoa Research Institute of Ghana (CRIG) in 2020/21 and 2021/22 cocoa seasons on farms at 4 locations: Assin Nkukuasa (Central Region), Bechem (Ahafo Region), and Konongo and New Edubiase (Ashanti Region). The trial utilized a randomized complete block design, incorporating 3 treatments and 2 replicates per location. The ages of the mixed hybrid cocoa variety trees ranged from 10 to 15 years.
Treatment 1 was the unfertilized control, treatment 2 was the reference granular fertilizer (NPK 0-22-18+9CaO+9MgO+7S) applied at 375 kg/ha per year, treatment 3 was Polysulphate granular fertilizer applied at 375 kg/ha per year. All recommended agronomic practices were followed.
Results
- Polysulphate significantly increased the two-year cumulative dry cocoa bean yield at 3 of the 4 locations.
- On average, Polysulphate increased the dry bean yield by 13.6% compared with the reference granular fertilizer and by 70.8% compared with the unfertilized control.
- Based on these results, Polysulphate is considered suitable for mature cocoa plantations at the application rate of 375 kg/ha.
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