A comparativt study on some roquette genotypes and their response to planting date and nitrogen levels [electronic resource].

Includes references.

This study was carried out during the winter seasons of 1998-1999 and 1999-2000 at Barrage Research Station (D.R.I., Egypt) to evaluate sixteen genotypes of roquette (Eruca saliva) as a first experiment and to evaluate the effect of different sowing dates (15. October and 15'" November) and nitrogen levels (0, 40, 60 and 80 kg N/fed) on vegetative growth, fresh yield, chemical COmposition of plant foliage as well as seed yield quality and the oil percentage of sleeds as a second experiment. 1be results indicated that vegetative growth parameters (plant length, number of leaves/plant, average leaf area and fresh yield/fed.), chlorophyll a.b and carotenoieds, vitamin C, seed yield and the oil percentage were varied 8J11ong the used strains. Mansoura strain followed by Ismaillia and Zagazig strains gave the best results for all the previously mentioned attributes. On the other hand, the lowest values were recorded by Dokki. QiIIa and Suhage strains. Although Mansoura strain gave the highest seed germination percentage, it recorded the lowest values for germination rate and the number ot~gm. Early planting (15th of Oct.) combined with the highest used level of N (80 kg/fed.) reported the highest values of all studied growth . parameters especially in ISmaillia and Mansoura strains compared with Suhage and AswIut Straips. On the contrary, nitrate-N content was decreased with early sowing and the lowest lever of nitrogen fertilizer.

Summary in Arabic.

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