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Copy link Polysulphate® Bean Trial in Mexico
Yield Increase
Celaya, Guanajuato, Mexico 2019
Yield Increase
Key Conclusions
Trial shows the residual effect of Polysulphate. Bean yield increased by up to 24% after previous maize crop was fertilized with Polysulphate.
Objective
To evaluate the residual effect of Polysulphate applied to a maize crop (as a complementary K and S source) on the yield of a subsequent bean crop.
Trial Details
Trial station
Celaya, Guanajuato, Mexico
Crop
Bean
Product
Granular Polysulphate 0-0-14
Assessments
Grain yield
Treatments
This randomized block trial consisted of 36 plots of beans (Phaseolus vulgaris var. Flor de Junio Leon): 1 control without K, 1 control with NPK, 4 Polysulphate rates (34, 68, 136, and 272 kg/ha) and 3 ammonium sulfate rates (55, 109 and 218 kg/ha).
Fertilizers were all applied and incorporated at maize planting in the previous year. During the maize crop cycle, all treatments received a total NPK application of 300, 100 and 50 kg/ha from urea, DAP and KCl using Polysulphate as complementary K and S source.
| Treatment | KCl | Polysulphate | Ammonium Sulphate |
|---|---|---|---|
| kg/ha | |||
| Control NP | 0 | 0 | 0 |
| Control NPK | 83 | 0 | 0 |
| Polysulphate:34 | 75 | 34 | 0 |
| Polysulphate:68 | 67 | 68 | 0 |
| Polysulphate:136 | 52 | 136 | 0 |
| Polysulphate:272 | 0 | 272 | 0 |
| AS:55 | 83 | 0 | 55 |
| AS:109 | 83 | 0 | 109 |
| AS:218 | 83 | 0 | 218 |
Treatments
This randomized block trial consisted of 36 plots of beans (Phaseolus vulgaris var. Flor de Junio Leon): 1 control without K, 1 control with NPK, 4 Polysulphate rates (34, 68, 136, and 272 kg/ha) and 3 ammonium sulfate rates (55, 109 and 218 kg/ha).
Fertilizers were all applied and incorporated at maize planting in the previous year. During the maize crop cycle, all treatments received a total NPK application of 300, 100 and 50 kg/ha from urea, DAP and KCl using Polysulphate as complementary K and S source.
| Treatment | KCl | Polysulphate | Ammonium Sulphate |
|---|---|---|---|
| kg/ha | |||
| Control NP | 0 | 0 | 0 |
| Control NPK | 83 | 0 | 0 |
| Polysulphate:34 | 75 | 34 | 0 |
| Polysulphate:68 | 67 | 68 | 0 |
| Polysulphate:136 | 52 | 136 | 0 |
| Polysulphate:272 | 0 | 272 | 0 |
| AS:55 | 83 | 0 | 55 |
| AS:109 | 83 | 0 | 109 |
| AS:218 | 83 | 0 | 218 |
Results
- Plots that had received Polysulphate for a previous crop exhibited higher bean yields than treatments without Polysulphate, corroborating the beneficial residual effect of Polysulphate on subsequent crops.
- Polysulphate rates of 136 and 272 kg/ha increased bean yield significantly, by more than 21%, compared to the NPK control and the ammonium sulfate treatments.
- A recommended rate of 150-200 kg/ha Polysulphate is suggested to improve bean yield in the Guanajuato State region, even if it is applied to a previous crop cycle.
Plots with residual Polysulphate produced increased bean yield.
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