article · Agronomy
Sunflower cultivation in arid environments demands substantial nitrogen, but conventional urea suffers from nutrient losses due to high solubility. Furthermore, sulphur is essential for increasing oil content and nutrient availability. A two-year field experiment evaluated the effects of polymer-coated urea compared to common urea, combined with three sulphur fertilisation rates of 0, 30, and 60 kg per hectare. The results demonstrated that polymer-coated urea notably enhanced nitrogen use efficiency, seed yield, and oil content over common urea. Adding 60 kg per hectare of sulphur similarly delivered marked improvements across all three measures. When combined, polymer-coated urea and 60 kg per hectare of sulphur achieved the highest gains, boosting nitrogen use efficiency by up to 39.5 percent, seed yield by up to 32.6 percent, and oil content by over 13 percent compared to untreated control plots.
Nitrogen loss from standard chemical fertilisers reduces crop productivity and wastes valuable agricultural inputs, especially in harsh, dry climates. By combining slow-release polymer-coated urea with sulphur fertilisation, farmers in arid areas can improve soil nutrient uptake. This approach significantly increases sunflower harvest yields and seed oil concentration, supporting more efficient and sustainable oilseed farming.
This research provides applied field evidence for sunflower growers and commercial fertiliser formulators operating in arid regions. The tested regime, pairing 130 kg per hectare of polymer-coated urea with 60 kg per hectare of sulphur, is an applied, field-tested strategy that demonstrates clear agronomic benefits. It informs input suppliers and farm managers seeking fertiliser blends that reduce nutrient loss and enhance harvest quality.
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Nitrogen and sulphur are fundamental macronutrients for the production of sunflower crop. Nitrogen is required consistently in larger amounts for sunflower production while common urea has more losses due to high solubility. On the other hand, sulphur application increases oil contents and availability of other essential nutrients (N, P, and K). Therefore, combined application of polymer coated urea with sulphur fertilization might be a promising option which can increase achene yield, oil contents, and nitrogen use efficiency (NUE). However, no particular studies have been conducted to explore the main and interactive effects of polymer coated urea and sulphur fertilization on growth, physiology, yield, oil contents, and NUE under arid field conditions. Hence, the current field experiment consisted of two nitrogen fertilizers [polymer coated urea (PCU) and common urea (CU)] and three sulphur fertilizer rates [S0 (0), S1 (30) and S2 (60) kg ha−1)] in a split-plot arrangement under randomized complete block design (RCBD) during spring season of 2019 and 2020. Experimental results revealed that growth, physiology, yield, oil contents, and NUE of sunflower crop were significantly improved with the application of nitrogen fertilizers, sulphur fertilizer rates, and their interaction. Meanwhile, NUE, achene yield and oil contents were increased by 16.0–17.2%, 16.5–17.0%, and 2.96–3.19% respectively with the application of PCU compared with CU. Furthermore, NUE, achene yield and oil contents were also increased by 12.8–13.3%, 13.1–13.7%, and 10.7–10.9%, respectively, due to sulphur fertilization of 60 kg ha−1compared with no sulphur application. Similarly, NUE, achene yield, and oil contents were increased by 32.9–39.5%, 31.7–32.6%, and 13.1–13.2% respectively with the application of PCU in combination with sulphur fertilization of 60 kg ha−1compared with CU × S0, which also evidenced a clear and positive interaction between nitrogen and sulphur. Conclusively, PCU (130 kg ha−1) in combination with sulphur fertilization of 60 kg ha−1 is promising option for obtaining higher achene yield, oil contents, and NUE for sunflower crop under arid environment, and hence, it might be a good agronomic adaptation strategy for sustainable production of sunflower.
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DOI: 10.3390/agronomy11020269
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