Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

Abstract

N fertilization has a substantial influence on sunflower (Helianthus annuus L.) seed yield and quality. It was also well established that high-yielding sunflower hybrids had more N requirement than old cultivars such as open-pollinated ones. However, in Turkey, no sufficient information regarding the response of new developed oilseed sunflower hybrids to nitrogen fertilization under irrigated conditions. Therefore, a 2-year study was conducted to determine the effects of nitrogen application rates on the growth, yield, and yield components of two oilseed sunflower hybrids (AS-508 and Super 25) under irrigated conditions. In this study, all plant parameters were significantly influenced by applied nitrogen fertilizer rates. Yield response to nitrogen rates was positive and linear. Our research data indicated that under irrigated conditions N rate of 120 kg/ha was adequate for sunflower production in this region.

Nutritional yield and economic responses of sunflower (Helianthus annuus l.) to integrated levels of nitrogen, sulphur and farmyard manure

“…The oil yield increased significantly and consistently with increase in nitrogen levels up to 120 kg /ha. These results confirm the findings of Ozer et al, (2004) and Aglave et al, (2009). Application of higher level of sulphur significantly increased the oil content and oil yield.…”

EFFECTS OF DIFFERENT NITROGEN DOSES ON YIELD AND QUALITY TRAITS OF COMMON SUNFLOWER (Helianthus annuus L.)

“…Plant height values of the present study comply with the findings of Ozer et al (2004) and Ergen and Saglam (2005). …”

“…The highest seed yield was observed in 15 kg nitrogen treatment (341.1 kg). Thusly in previous studies, Ozer et al (2004) reported significant effects of nitrogenous fertilizers on seed yield and quality and Ali et al (2012) and Nasim et al (2012) reported increasing sunflower yield levels with increasing nitrogen doses. Thavaprakash (2004) and Namvar et al (2012) observed the highest seed yield levels at 12 kg nitrogen dose and Evci et al (2006) reported the highest yield at nitrogen doses of between 5-10 kg.…”

Responses of sunflower (Helianthus annuus L.) to irrigation and nitrogen fertilization rates

“…The largest sunflower production centre of Turkey is the Marmara region (TUIK, 2010), and low yields are mainly due to the scanty precipitation during the summer in this region (Goksoy et al, 2004). Conversely, sunflower plants are rarely irrigated in areas where water resources are adequate; however, in Eastern Anatolia, sunflowers are only grown under irrigated conditions because of insufficient precipitation (Ozer et al, 2004). In addition to significantly responding to irrigation, sunflower clearly responds better to nitrogen fertilization under irrigated conditions compared with non-irrigated conditions.…”

“…Nevertheless, this fertilization technique is not a common practice in the sunflower production areas of Turkey, even though it has many advantages. Earlier studies indicated that the seed yield and its components are increased in sunflower with increasing rates of nitrogen under irrigated or non-irrigated conditions, and the highest yields were obtained from rates of 80-120 kg ha -1 N (Nawaz et al, 2003;Ozer et al, 2004;De Giorgio et al, 2007;Oyinlola et al, 2010).…”