Nitrogen Management of Diverse Sunflower (Helianthus annus L.) Hybrids Production under Agro-Climatic Conditions of Sargodha, Pakistan

A field study was carried out with the objective to determine the effect of various levels of nitrogen on growth, development, yield and yield components of different sunflower (Helianthus annuus L.) hybrids i.e. Hysun-33 and S-78 were evaluated under agro-climatic conditions of Sargodha, Pakistan during spring 2013. The experiment was laid out in a randomized complete block design with split plot arrangement having three replications, keeping cultivars in the main plots and N levels in the subplots. The net plot size was 4.2 m × 6 m. The growth parameters such are leaf area, leaf area duration and yield parameters were observed are Days to a thesis, Days to maturity, head diameter (cm), No. of achene’s per head, Achene yield (kg&#183ha-1) and total dry matter (kg). The results showed that increasing the nitrogen rate also increased the No. of achene’s per head, Achene yield (kg&#183ha-1) and total dry matter (kg) in S-78 hybrid where the nitrogen application rate was 180 kg&#183ha-1 as compared to Hysun-33 cultivar.