Two field experiments were carried out at Giza Agricultural Research
Station, ARC, Egypt, during 2000- 2001 and 2001- 2002 seasons to identify
the effective pan coefficient (selected from 1.4, 1.2, 1.0, and 0.8 treatments)
needed for scheduling irrigation of canola plants (using pan evaporation
records) Under three nitrogen sources Nj (ammonium nitrate), N; (50%
ammonium nitrate + azotobai ter) and NS (50% ammonium nitrate +
azospirillum). The effects of the two selected factors on water relations, seed
and oil yields, yield components, oil%, protein% and fatty acids composition
were studied.
Results of the two growing seasons indicated that plant height, number
of branches/ plant, 100- seed weight and seed yield/fed were significantly
increased with the trealmenl of i.O pan evaporation coefficient. Also, all
studied growth characters were superior when the ammonium nitrate was
applied.
Seed oil percent was increased with [3 (1.0 pan evaporation coefficient)
and N; (50% ammonium nitrate + azotobacter). Meanwhile, protein percent
was increased for b irrigation treatment with Nj (50% ammonium nitrate +
azospiiiilum). Oil yield was increased for I.i witii Nj. However, the differences
between N| and N; didnot reach the level ofsignificar.ee. Predominant fatty
acids comprised palmitic, stearic, arachidic. behenic, oleic, linoleic, linolenic,
gadoleic and erucic acids.
Major fatty acids comprised oleic, linoleic, linolenic.The minor acids
were palmitic, stearic, gadoleic and erucic. Oleic, lenoleic and lenolenic acids
ranged from 56.68 to 56.74%, 18.72 to 18.79% and 8.55 to 8.76%,
respectively.
Seasonal water consumptive use values were 1637 and 1601 mVfed in
2000- 2001 and 2001- 2002 seasons, respectively. The maximum water use
efficiency value was obtained when the evaporation pan coefficient of i.O
together with N2 (50% ammonium nitrate f- azotobacter) were applied in both
seasons.
Results indicated also that the most efficient method for calculating
canola crop evapotranspiration (ETc) in Middle Egypt was Penman Monteith
formula.
|
