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Copy link Polysulphate Rice Trial in Ecuador
2.5
Yaguachi, Guayas 2023
2.5
Objective
To evaluate the effect of Polysulphate, as a complementary K and S source partially substituting KCl (MOP) fertilizer, on rice yield, harvest index, grain quality and sheath rot incidence.
Trial Details
Trial station
Yaguachi, Guayas
Crop
Rice
Product
Polysulphate®
Assessments
White center presence in grains and Sarocladium (sheath rot) incidence, Yield and Harvest Index
Treatments
This randomized block trial consisted of twenty plots with three Polysulphate doses (0, 160 and 240 kg/ha) plus two ammonium sulphate doses (129 and 192 kg/ha) applied incorporated at planting and 15 days later. All treatments received a total NPK application of 140, 20 and 60 kg/ha from urea, DAP and KCl. Polysulphate was used as a complementary K source that reduced the KCl application, and a sulphur source to be compared with ammonium sulphate.
Treatments
This randomized block trial consisted of twenty plots with three Polysulphate doses (0, 160 and 240 kg/ha) plus two ammonium sulphate doses (129 and 192 kg/ha) applied incorporated at planting and 15 days later. All treatments received a total NPK application of 140, 20 and 60 kg/ha from urea, DAP and KCl. Polysulphate was used as a complementary K source that reduced the KCl application, and a sulphur source to be compared with ammonium sulphate.
Results
- Polysulphate and ammonium sulphate both increased rice yield by 2.5%, but Polysulphate increased harvest index by up to 11%.
- A significant positive effect on grain quality and disease tolerance in rice was observed with Polysulphate applications of up to 240 kg/ha.
- Addition of S from Polysulphate reduced white center in grains by 15 to 19% and diminished Sarocladium incidence by up to 66%.
- The recommendation for the Guayas region is that Polysulphate applied at planting at a rate of 150-200 kg/ha will improve rice productivity and grain quality.
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