Effect of fertilizer on spring season sunflower
2007
Yousaf, M. (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Program) | Bakht, J. (NWFP Agricultural Univ., Peshawar (Pakistan)) | Ashraf, M. (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Program) | Ihsanullah (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Program)
Judicious nutrient management plays a critical role in increasing per unit area of sunflower. As sunflower is a new crop in Pakistan, information on the appropriate dose of N, P and K is urgently needed. Considering the importance of major nutrients with regard to yield, fertilizer impact on two commercial hybrids of sunflower (Parsun-1 and SF-187) was studied. Field experiments were conducted at National Agricultural Research Centre (NARC), Islamabad in two spring seasons during 2001 and 2002. In these experiments, low, medium and high rates each of N, P and K (0, 50, 100,150 kg per ha) were applied with central treatment design with 11 treatments that gives four point curves for N, P and K. A sub plot size of 4.5 m x 5 m with 6 rows 5 m length spaced 75 cm apart with plant to plant distance of 20 cm was used with four replications. Statistical analysis of the data showed that days to R9 (physiological maturity) increased with increase in fertilizer levels as compared with control. Days to maturity ranged from 120 to 127 days. Parsun-1 matured 4-5 days later than SF-187. Head diameter, 100 seed weight and seed yield increased with increase in fertilizer levels in all combinations in comparison with control. Highest seed yield (3586 kg per ha) was produced by treatment with 150:100:100 N P2O5 K2O kg per ha, whereas, lowest yield (2840 kg per ha) was observed in control plot. Oil content varied insignificantly with different combinations of NPK and ranged from 38% to 44%. Increasing nitrogen (N) rate had decreasing effect on oil content. Hybrid Parsun-1 had comparatively higher oil content than hybrid SF-187.
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