Polysulphate Wheat Trial

16

Yield increase
Polysulphate is an excellent source of potassium and sulfur for wheat, improving yield, protein content, and income.

León Province, Spain
2022

Trail

16

Yield increase

Key Conclusions

Using Polysulphate instead of the usual practice of DAP and iron sulfate increased wheat yield by 16%, and increased the protein content of the wheat by 22%. Overall, the net income from the wheat crop rose by 149% when Polysulphate was used.

Objective

To investigate the efficiency of Polysulphate as a potassium source which also includes sulfur, and to compare it with the farmers’ practice which requires iron sulfate as an additional source of sulfur for wheat.

Trial Details

Trial station

León Province, Spain

Crop

Wheat

Product

Granular Polysulphate

Assessments

NDVI, yield, protein content in grain, and grain specific weight

Treatments

This field experiment on Wheat (Triticum durum, cv. Solindo R1) was conducted in a randomized complete block design with two replicates. The experiment tested three treatments: farmers’ practice without sulfur application, farmers’ practice including an application of iron sulfate at a dose of 200 kg/ha, and Polysulphate applied at 300 kg/ha. The Polysulphate provided all the potassium (42 kg K2O/ha) and the sulfur (58 kg S/ha) as sulfate.

In all three treatments, the nitrogen and phosphorus applications were maintained at 198 kg N/ha and 92 kg P2O5/ha by applying calcium ammonium nitrate and DAP. Potassium was applied at 42 kg K2O/ha, as KCl in the two farmers’ practice treatments and as Polysulphate in the 3rd treatment. All fertilizers were incorporated before sowing, except calcium ammonium nitrate which was applied as top dressing.

Treatments

This field experiment on Wheat (Triticum durum, cv. Solindo R1) was conducted in a randomized complete block design with two replicates. The experiment tested three treatments: farmers’ practice without sulfur application, farmers’ practice including an application of iron sulfate at a dose of 200 kg/ha, and Polysulphate applied at 300 kg/ha. The Polysulphate provided all the potassium (42 kg K2O/ha) and the sulfur (58 kg S/ha) as sulfate.

In all three treatments, the nitrogen and phosphorus applications were maintained at 198 kg N/ha and 92 kg P2O5/ha by applying calcium ammonium nitrate and DAP. Potassium was applied at 42 kg K2O/ha, as KCl in the two farmers’ practice treatments and as Polysulphate in the 3rd treatment. All fertilizers were incorporated before sowing, except calcium ammonium nitrate which was applied as top dressing.

Results

  • Polysulphate improved the biomass, measured by NDVI, at the tillering and flowering stages.
  • Wheat yield was 16% higher with Polysulphate compared to iron sulfate.
  • Protein content of wheat fertilized with Polysulphate was 0.8% higher (an 8% increase) compared with iron sulfate, and up by 2.2% (a 22% increase) compared with the farmers’ practice.
  • Polysulphate increased the grain specific weight by 1.7% compared with iron sulfate and 2.1% compared with the farmers’ practice.
  • Polysulphate increased the net income from the wheat crop by 149% compared with iron sulfate.

 

Polysulphate improves wheat yield, protein content, and farm income

Polysulphate increases wheat yield and protein content compared to the standard farmer’s practice

 

 

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