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Copy link Polysulphate Bean Trial in Brazil
24
Celaya, Mexico 2019
24
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, Mexico
Crop
Bean
Product
Granular Polysulphate
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 |
The subsequent bean crop treatments all received 60 kg/ha of N from urea. The residual effect of the previous fertilization treatments on the bean crop yield was measured.
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 |
The subsequent bean crop treatments all received 60 kg/ha of N from urea. The residual effect of the previous fertilization treatments on the bean crop yield was measured.
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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