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Copy link Polysulphate Cauliflower Trial in India
39.5
Hessaraghatta, Karnataka, India 2014
39.5
Key Conclusions
The highest yield was obtained with a full dose of NPK and 75% sulfur (S) dose delivered through Polysulphate (T4), which gave rise to a 39.5% increase in the yield of cauliflower.
Objective
To test the efficacy of Polysulphate as a sulfur source on the performance of cauliflower (Brassica oleracea var. botrytis) in India.
Trial Details
Trial station
Hessaraghatta, Karnataka, India
Crop
Cauliflower
Product
Standard Polysulphate
Assessments
Yield, quality, growth parameters, 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 (10 kg S/ha) (balanced K through MOP to make 100% K)
- T4: 100% NP + 75% S through Polysulphate (15 kg S/ha) (balanced K through MOP to make 100% K)
- T5: 100% NP + 100% S through Polysulphate (20 kg S/ha) (balanced K through MOP to make 100% K)
- T6: 100% NPK (urea, DAP, MOP) + 100% S through gypsum (20 kg S/ha)
The recommended dose of fertilizers: 150 kg N, 100 kg P2O5, 125 kg K2O/ha and 20 kg S/ha was applied as per the treatments. Farmyard manure (FYM) was also applied at 25 t/ha in the last plough.
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 (10 kg S/ha) (balanced K through MOP to make 100% K)
- T4: 100% NP + 75% S through Polysulphate (15 kg S/ha) (balanced K through MOP to make 100% K)
- T5: 100% NP + 100% S through Polysulphate (20 kg S/ha) (balanced K through MOP to make 100% K)
- T6: 100% NPK (urea, DAP, MOP) + 100% S through gypsum (20 kg S/ha)
The recommended dose of fertilizers: 150 kg N, 100 kg P2O5, 125 kg K2O/ha and 20 kg S/ha was applied as per the treatments. Farmyard manure (FYM) was also applied at 25 t/ha in the last plough.
Results
- S application significantly contributed to increased yield and quality (curd diameter and compactness at harvest) of cauliflower.
- S application in the form of Polysulphate, up to 75% of the recommended S dose (T4), enhanced plant growth and development, improving plant height and number of leaves.
- N, K, Ca, and S uptake by cauliflower crop was highest when S was applied in the form of Polysulphate, up to 75% of the recommended S dose (T4).
- The highest yield was obtained with a full dose N-P-K and 75% S dose delivered through Polysulphate (T4), which gave rise to 39.5% increase in the yield of cauliflower, compared to the non-fertilized control (T1).
Delivering 75% of S with Polysulphate increases cauliflower yield by 39.5%.
Bars indicate LSD at P<0.05.
* From research funded by the International Potash Institute www.ipipotash.org.
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