Polysulphate Potato Trial in Spain

7.6

Tuber Yield increase
Polysulphate fertilizer is a soluble, easily absorbed, cost-effective answer to crop nutrition, containing four key plant nutrients: sulfur, potassium, magnesium, and calcium.

La Rinconada, Sevilla, Spain
2022

Trail

7.6

Tuber Yield increase

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.

 

TreatmentFertilizerDoseSO3Application
kg/hakg/ha
Farmers’ practice, blend without iron sulfate9-18-27600Basal
KCl190Basal
NAC540Spit
Farmers’ practice, blend with iron sulfate5-10-251,100127Basal
NAC540127Spit
Blend with PolysulphatePolysulphate1,375385Basal
NAC500385Top 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.

 

TreatmentFertilizerDoseSO3Application
kg/hakg/ha
Farmers’ practice, blend without iron sulfate9-18-27600Basal
KCl190Basal
NAC540Spit
Farmers’ practice, blend with iron sulfate5-10-251,100127Basal
NAC540127Spit
Blend with PolysulphatePolysulphate1,375385Basal
NAC500385Top 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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