Response of sunflower to various levels of nitrogen and phosphorus
2003
Arif, M. | Kakar, K.M. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Agronomy) | Kakar, G.M.
To study the response of sunflower to various levels of nitrogen and phosphorous, an experiment was conducted in pots at NWFP Agricultural University Peshawar, during 1997. Four nitrogen levels 0, 80, 120, 160 kg/ha and three phosphorous levels 0,60,90 kg/ha were included in the experiment. Increase in nitrogen levels significantly increased head diameter, grain yield per head and thousand-grain weight. Maximum head diameter (25.71), grain yield per head (114.84g) and thousand-grain weight (75.67g) was recorded at nitrogen level of 160 kg/ha. Increased in phosphorus level increased plant height and thousand grains weight. Tallest plants (198.92 cm) were observed at 60 kg P/ha while heavy grains (70.67g) were recorded at P level of 90 kg P2O5/ha. It is concluded that 160 kg N/ha and 90 kg P/ha is proper dose of N and P for sunflower hybrid.
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