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Copy link Polysulphate Mustard Trial in India
35
Kanpur, Uttar Pradesh, India 2014
35
Key Conclusions
Polysulphate fertilizer significantly increases mustard seed yield by up to 35%, and the mustard oil yield by up to 39% compared to the control.
Objective
To test the efficacy of Polysulphate as a sulfur source on the performance of mustard (Brassica juncea) crops in India.
Trial Details
Trial station
Kanpur, Uttar Pradesh, India
Crop
Mustard
Product
Standard Polysulphate
Assessments
Yield, yield components, oil content, and nutrient uptake
Treatments
The experiment was laid out in a randomized block design with 3 replicates and included 6 treatments:
- T1: Control without S and K fertilization (100% NP through urea and DAP only)
- T2: 100% NPK (urea, DAP, Muriate of Potash (MOP))
- T3: 100% NP + 50% S through Polysulphate (20 kg S/ha) (balanced K through MOP to make 100% K)
- T4: 100% NP + 75% S through Polysulphate (30 kg S/ha) (balanced K through MOP to make 100% K)
- T5: 100% NP + 100% S through Polysulphate (40 kg S/ha) (balanced K through MOP to make 100% K)
- T6: 100% NPK (urea, DAP, MOP) + 100% S through gypsum (40 kg S/ha).
The recommended dose of fertilizers: 120 kg N, 60 kg P2O5, 60 kg K2O/ha and 40 kg S/ha was applied according to the treatments. The full dose of P, K, and S and a half dose of N were applied at the time of sowing as a basal application. The remaining half dose of N was applied in 2 equal splits.
| Treatment | N | P | K | S | Source of fertilizer | |
|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | |||
| T1 | NP 100% | 120 | 60 | 0 | 0 | Urea and DAP |
| T2 | NPK (control) | 120 | 60 | 60 | 0 | Urea, DAP, and MOP |
| T3 | NPKS20 Polysulphate | 120 | 60 | 60 | 20 | Urea, DAP, MOP, and Polysulphate |
| T4 | NPKS30 Polysulphate | 120 | 60 | 60 | 30 | Urea, DAP, MOP, and Polysulphate |
| T5 | NPKS40 Polysulphate | 120 | 60 | 60 | 40 | Urea, DAP, MOP, and Polysulphate |
| T6 | NPK 100S40 gypsum | 120 | 60 | 60 | 40 | Urea, DAP, MOP, and gypsum |
Treatments
The experiment was laid out in a randomized block design with 3 replicates and included 6 treatments:
- T1: Control without S and K fertilization (100% NP through urea and DAP only)
- T2: 100% NPK (urea, DAP, Muriate of Potash (MOP))
- T3: 100% NP + 50% S through Polysulphate (20 kg S/ha) (balanced K through MOP to make 100% K)
- T4: 100% NP + 75% S through Polysulphate (30 kg S/ha) (balanced K through MOP to make 100% K)
- T5: 100% NP + 100% S through Polysulphate (40 kg S/ha) (balanced K through MOP to make 100% K)
- T6: 100% NPK (urea, DAP, MOP) + 100% S through gypsum (40 kg S/ha).
The recommended dose of fertilizers: 120 kg N, 60 kg P2O5, 60 kg K2O/ha and 40 kg S/ha was applied according to the treatments. The full dose of P, K, and S and a half dose of N were applied at the time of sowing as a basal application. The remaining half dose of N was applied in 2 equal splits.
| Treatment | N | P | K | S | Source of fertilizer | |
|---|---|---|---|---|---|---|
| kg/ha | kg/ha | kg/ha | kg/ha | |||
| T1 | NP 100% | 120 | 60 | 0 | 0 | Urea and DAP |
| T2 | NPK (control) | 120 | 60 | 60 | 0 | Urea, DAP, and MOP |
| T3 | NPKS20 Polysulphate | 120 | 60 | 60 | 20 | Urea, DAP, MOP, and Polysulphate |
| T4 | NPKS30 Polysulphate | 120 | 60 | 60 | 30 | Urea, DAP, MOP, and Polysulphate |
| T5 | NPKS40 Polysulphate | 120 | 60 | 60 | 40 | Urea, DAP, MOP, and Polysulphate |
| T6 | NPK 100S40 gypsum | 120 | 60 | 60 | 40 | Urea, DAP, MOP, and gypsum |
Results
- Mustard yield increased significantly and steadily in response to the increasing S dose applied through Polysulphate (T3-T5).
- Mustard seed yield at the maximum S dose, 40 kg/ha applied with Polysulphate (T5), increased by 35% compared with zero S application (T2).
- The response of oil yield to Polysulphate application was dramatic, providing a 39% increase in oil (T5 vs. T2). Sulfur applied through gypsum (T6) also gave rise to a significant increase in oil yield, although to a lesser extent than Polysulphate.
- Yield components like pods per plant, pod length, seeds per pod, and seed weight were highest at the maximum S level (T5).
- K and S uptake by mustard crop increased with increasing S dose applied through Polysulphate (T3-T5).
Polysulphate significantly increases mustard seed yield by up to 35%.
From research funded by the International Potash Institute www.ipipotash.org.
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