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Copy link Polysulphate Potato Trial in Spain
7.6
La Rinconada, Sevilla, Spain 2022
7.6
Objective
To investigate the effectiveness of Polysulphate as a sulfur source for potato crops. In this trial, Polysulphate, which includes sulfur, potassium, magnesium, and calcium is compared with two local farmers’ practices that either don’t include sulfur or use iron sulfate as the source of sulfur.
Trial Details
Trial station
La Rinconada, Sevilla, Spain
Crop
Potato
Product
Polysulphate®
Treatments
The trial consisted of 4 treatments and 4 repetitions, in a randomized block design. In the three treatments which received fertilizers, the nitrogen, phosphorus, and potassium applications were maintained at 200 kg N/ha, 110 kg P2O5/ha and 275 kg K2O/ha.
| Treatment | Fertilizer | Dose | SO3 | Application | ||||
|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | |||||||
| Farmers’ practice, blend without iron sulfate | 9-18-27 | 600 | Basal | |||||
| KCl | 190 | Basal | ||||||
| NAC | 540 | Spit | ||||||
| Farmers’ practice, blend with iron sulfate | 5-10-25 | 1,100 | 127 | Basal | ||||
| NAC | 540 | 127 | Spit | |||||
| Blend with Polysulphate | Polysulphate | 1,375 | 385 | Basal | ||||
| NAC | 500 | 385 | Top dress |
Treatments
The trial consisted of 4 treatments and 4 repetitions, in a randomized block design. In the three treatments which received fertilizers, the nitrogen, phosphorus, and potassium applications were maintained at 200 kg N/ha, 110 kg P2O5/ha and 275 kg K2O/ha.
| Treatment | Fertilizer | Dose | SO3 | Application | ||||
|---|---|---|---|---|---|---|---|---|
| kg/ha | kg/ha | |||||||
| Farmers’ practice, blend without iron sulfate | 9-18-27 | 600 | Basal | |||||
| KCl | 190 | Basal | ||||||
| NAC | 540 | Spit | ||||||
| Farmers’ practice, blend with iron sulfate | 5-10-25 | 1,100 | 127 | Basal | ||||
| NAC | 540 | 127 | Spit | |||||
| Blend with Polysulphate | Polysulphate | 1,375 | 385 | Basal | ||||
| NAC | 500 | 385 | Top dress |
Results
- The treatment with Polysulphate resulted in the highest crop height
- The application of Polysulphate resulted in the greatest tuber yield (7.6% greater than the control treatment)
- No differences were observed between the treatments in quality parameters (dry matter and starch content)
- Polysulphate increased the net income by 6.3% as compared with the farmers’ practice without iron sulphate application, and by 5.5% as compared with the farmers’ practice treatment with iron sulfate
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