Relative efficiency of different nitrogen sources and levels for rapeseed under irrigated conditions
2007
Rohul-Amin (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Research Programme) | Ali, N. (National Agricultural Research Centre, Islamabad (Pakistan). Oilseed Research Programme) | Arain, Y. (National Sugarcane Research Inst., Thatta (Pakistan)) | Tabassam, T. (National Agricultural Research Centre, Islamabad (Pakistan). Land Resources Research Programme)
Three nitrogen levels i.e. 30, 60 and 90 kg N ha-1 from three different sources viz., urea, ammonium nitrate (A/N) and ammonium sulphate (A/S) were tested to see their effect on yield, quality and other agronomic parameters of rapeseed under irrigated conditions. Among the three sources tested, ammonium sulphate proved to be the best source followed by urea and then ammonium nitrate regarding yield and other agronomic parameters. Among the rates of nitrogen 60 kg N ha-1 from A/S was the best rate followed by 90 kg N ha-1 from urea and A/N respectively during 2000-2001, while 90 kg N ha-1 gave highest yield followed by 60 kg N ha-1 from A/S and 90 kg N ha-1 from A/N during 1999-2000. Highest grain yield of 1730 kg ha-1 was obtained by application of 90 kg N ha-1 from urea in 19992000 and 1813 kg ha-1 from 60 kg N ha-1 A/S during 2000-2001. Increasing levels of nitrogen from either of the three sources increased yield, oil contents, plant height , seed weight and decreased erucic acid and glucosinolates contents.
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