Exhibitor Press Releases

LAMMA Subpage

30 Mar 2022

Polyphosphate increases marketable yield by 18% in potato trial.

Polyphosphate increases marketable yield by 18% in potato trial.
North Lincolnshire trial with variety Maris Piper, sandy loam with a soil analysis of potassium – index 2; magnesium – index 5; phosphate – index 2 and pH 7.1.

Trials at field scale have proven improvements in both potato output and marketable yield from treatments with ICL’s Polysulphate and PotashpluS.

“The trials bear out findings from previous years of the benefits of our products for the crop,” said ICL agronomist Scott Garnett.

In North Yorkshire a crop of the variety Brooke was grown on a sandy loam soil. The split field trial sought to assess the potential for Polysulphate or PotashpluS to replace GMOP. Three rates of Polysulphate were applied – 100, 200 and 300kg/ha. PotashpluS was applied at 895kg/ha. These treatments were compared with a control of granular muriate of potash applied at 550kg/ha.

Polysulphate was applied just before planting, while potash products were applied a month earlier. These treatments applied nutrients as follows:

 

Nitrogen

kg/ha

Phosphate

kg/ha

Potassium

kg/ha

Magnesium

kg/ha

Calcium

kg/ha

Sulphur

kg/ha

  1. Control

200

170

330

40

0

96

  1. PotashpluS
    895kg/ha

200

170

330

43

52

215

  1. Polysulphate 100kg/ha

200

170

330

43

17

138

  1. Polysulphate 200kg/ha

200

170

330

43

34

174

  1. Polysulphate 300kg/ha

200

170

330

43

51

210

 

The trials were harvested using five 2m replicated digs from each treatment. Total yield was recorded along with four graded outputs.

All treatments increased total and marketable yield compared to the control. However, the best result was achieved from Polysulphate applied at 100kg/ha.

The second trial in North Lincolnshire used the variety Maris Piper, again grown on a sandy loam with a soil analysis of potassium – index 2; magnesium – index 5; phosphate – index 2 and pH 7.1.

This split field trial explored the effect of sulphur on potato production using Polysulphate as the sole source of S. An application of 200kg/ha of Polysulphate was added to the standard farm practice. Giving total nutrients as follows:

 

Nitrogen

kg/ha

Phosphate

kg/ha

Potassium

kg/ha

Magnesium

kg/ha

Calcium

kg/ha

Sulphur

kg/ha

  1. Farm Practice

140

119

225

0

0

0

  1. Farm Practice with Polysulphate

140

119

226

12

34

96

 

In this trial Polyphosphate boosted marketable yield by 18% compared to the control. 

These results confirm results gained in previous years and highlight the economic benefit to be gained from applying Polysulphate and the importance of sulphur to the potato crop.

Loading

Farmers Guardian

Media Partner

IAGRE

Young Engineer Award supporter