GROWTH RESPONSE OF CERTAIN FLAX VARIETIES TO NITROGEN FERTILIZATION AND PLANT DENSITY

Document Type : Original Article

Authors

1 Faculty of Agriculture, Ain Shams University, Cairo, Egypt

2 Central Laboratory for Food and Feed, Agricultural Research Centre, Giza, Egypt

Abstract

The response of two flax varieties, i.e. Giza "7" and Giza "8" to three levels of nitrogen fertilization (45, 60 and 75 Kg NI fed.) and three seeding rates (40,50 and 60 kg/fed.) were studied in two succes‌sive seasons of 1990/91 and 1991/92, concerning growth, growh anal‌ysis as well as physiological growth parameters of flax plants. The main findings may be summarized as Follows : Leaves area/plant, total and technical length of Giza "8" exceed‌ed significantly those of Giza "7" at different stages of growth. On the other hand, net assimilation rate (NAR), relative growth rate (RGR) and crop growth rate (CGR) of Giza "7" were higher than those of Giza "8". There was a decrease in number of leaves/plant, leaves area / plant, dry weight of root, stern and leaves/plant at all growth stages with increasing seeding rate from 40 to 60 kg/fed. The dry weight of the different organs/plant became great with low seeding rate (40 kg/fed.). RGR increased with the decrease of plant population density. Also, NAR increased gradually to the third sampling date, then decreased in last sampling date. The seed rate of 40 kg/fed. gave the highest value of NAR. Increasing nitrogen level from 45 to 75 kg/fed. caused a signifi‌cant increase in plant height, root length, number of leaves/plant, leaf area/plant, dry weight of root, stem and leaves/plant, RGR. NAR and CGR.

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