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Copy link Polysulphate Cabbage Trial in Turkey
45
Antalya, Turkey 2017
45
Key Conclusions
Using Polysulphate fertilizer increased cabbage yield by up to 45% over the control. There was also in increase in the net return for the farmer with a benefit:cost ratio of 20.3 for the Polysulphate treatment.
Objective
To investigate the effect of Polysulphate, potassium sulfate (SOP) and potassium chloride (MOP, KCl) on the yield, quality parameters, and nutrient uptake of cabbage (Brassica oleracea).
Trial Details
Trial station
Antalya, Turkey
Crop
Cabbage
Product
Granular Polysulphate
Assessments
Yield, quality, growth parameters, and nutrient uptake
Treatments
This randomized trial consisted of 4 replicates with 5 treatments. Nitrogen, phosphorus, and potassium were applied according to target yield and soil tests at a rate of 250 kg N/ha (as urea and di-ammonium phosphate, DAP), 100 kg P2O5/ha (as di-ammonium phosphate, DAP) and 300 kg K2O/ha (as Polysulphate, SOP or MOP). An additional treatment consisted of K given 50% from SOP and 50% from Polysulphate. Control treatment received the same N and P doses, but no K was applied.
| Treatment | Nutrient | Fertilizer | |||||||
|---|---|---|---|---|---|---|---|---|---|
| N | P2O5 | K2O | CaO | MgO | SO3 | Polysulphate | SOP | MOP | |
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| T1 control | 250 | 100 | - | - | - | - | - | - | - |
| T2 MOP | 250 | 100 | 300 | - | - | - | - | - | 500 |
| T3 SOP | 250 | 100 | 300 | - | - | 270 | - | 600 | - |
| T4 SOP+Polysulphate | 250 | 100 | 300 | 182 | 64 | 649 | 1,071 | 300 | - |
| T5 Polysulphate | 250 | 100 | 300 | 364 | 128 | 1,028 | 2,140 | - | - |
Treatments
This randomized trial consisted of 4 replicates with 5 treatments. Nitrogen, phosphorus, and potassium were applied according to target yield and soil tests at a rate of 250 kg N/ha (as urea and di-ammonium phosphate, DAP), 100 kg P2O5/ha (as di-ammonium phosphate, DAP) and 300 kg K2O/ha (as Polysulphate, SOP or MOP). An additional treatment consisted of K given 50% from SOP and 50% from Polysulphate. Control treatment received the same N and P doses, but no K was applied.
| Treatment | Nutrient | Fertilizer | |||||||
|---|---|---|---|---|---|---|---|---|---|
| N | P2O5 | K2O | CaO | MgO | SO3 | Polysulphate | SOP | MOP | |
| kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | kg/ha | |
| T1 control | 250 | 100 | - | - | - | - | - | - | - |
| T2 MOP | 250 | 100 | 300 | - | - | - | - | - | 500 |
| T3 SOP | 250 | 100 | 300 | - | - | 270 | - | 600 | - |
| T4 SOP+Polysulphate | 250 | 100 | 300 | 182 | 64 | 649 | 1,071 | 300 | - |
| T5 Polysulphate | 250 | 100 | 300 | 364 | 128 | 1,028 | 2,140 | - | - |
Results
- Uptake of Ca, Mg and S were highest in the Polysulphate treatment. Also, Ca, Mg, and S concentrations in the leaves were highest in the Polysulphate treatment.
- Polysulphate + SOP treatment resulted in the highest total and marketable yield, followed by the Polysulphate treatment. Also head weight, width and height followed the same behavior.
- Polysulphate application increased the net return and was very profitable, with a B:C (benefit:cost ratio) of 20.3 for the Polysulphate treatment and 28.3 for the Polysulphate+SOP treatment.
- The highest antioxidant activity, phenols concentration, and total soluble solids (TSS) were found in the Polysulphate+SOP treatment, followed by the Polysulphate treatment which statistically did not differ from the Polysulphate+SOP treatment. Vitamin C concentration was found to be highest with the Polysulphate treatment.
Polysulphate fertilizer increased cabbage yield by 45%.
Polysulphate fertilizer increased cabbage Mg, S, and Ca uptake.
Different letters above bars indicate significant differences among treatments (p<0.001).
* From research funded by the International Potash Institute www.ipipotash.org.
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