Response of rapeseed (brassica napus l.)‎ varieties to nitrogen and phosphorus fertilizer in yield and its components under two different sowing

الملخص EN

A field experiment was carried out during 2017, using factorial split- split- plot experiment laid out in RCBD, to investigate the effect of planting date on plant height, seed yield kg ha-1 and its components of two spring rapeseed (Brassica napus L.) varieties under three N/P2O5 fertilizer levels.

The results of experiment showed the tallest plant and greater yield and yield components (number of branches per plant, number of pod per plant, length of pod (cm), pods weight (g) per plant, number of seed per pod, 1000 seed weight (g), biological kg ha-1 , and harvest index were obtained at earlier planting date (7th March) and under 90/60 kg N/P2O5 ha-1 fertilizer by Dunkild variety with values (105.40, 12.33, 82.33,7.09, 7.08, 17.57, 3.13, 781.15, 266.19 and 0.34) respectively, for all mentioned parameters in comparison with Sherally variety under other N/P2O5 levels and late planting date