Irrigation Interval and Nitrogen Level Effects on Growth and Yield of Canola (Brassica napus L.)

(Khalid bin Mohammed Al-Barrak)

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Abstract

A field experiment was carried out to determine the effect of irrigation intervals and nitrogen levels on canola "cv. Fido" on a sandy loam soil during 2000/2001 and 2001/2002 seasons. Irrigation intervals had significant effects on growth characters as well as seed and oil yields/ha, but it did not induce maked effect on seed oil percentage. The highest values of plant height, stem diameter, number of pods/plant, number of seeds/pod, seed weight/plant as well as seed and oil yields/ha were produced with irrigation every 7 or 14 days. Nitrogen rates had significant effects on all estimated characters, except the harvest index and seed oil percentage. The highest nitrogen rates (120-180 kg N/ha) were associated with an increase in all estimated characters, except seed oil percentage, which took the reverse trend. The interaction between irrigation intervals and nitrogen rates had significant effects on seed and oil yields/ha. Irrigation canola every 7 or 14 days and fertilizing with 120-180 kg N/ha produced the highest seed and oil yields/ha. The optimum water use efficiency was obtained with the irrigation every 14 days, particularly with the addition of 180 kg N ha-1.
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