INTERACTIVE EFFECTS OF ZINC AND DIFFERENT NITROGEN SOURCES ON YIELD AND QUALITY OF ONION

Document Type : Original Article

Authors

Vegetable Research Department, National Research Center, Dokki, Cairo, Egypt

Abstract

and 2003 to investigate the interactive effect of Zn and different nitrogen sources, i.e.,
mineral nitrogen (ammonium sulfate) and organic nitrogen (poultry manure) on the
growth and productivity of onion (Allium cepa) cv. Giza 20. Four levels of Zn
application (0, 1, 2 and 3 ppm) in a sulfate form were foliar sprayed at 30 and 60 days
after planting. Within each Zn application, three treatments of nitrogen dose were
applied in different combination forms (mineral and organic sources). Nitrogen
treatments were 100% mineral N; 75% mineral + 25% organic and 50% mineral + 50%
organic. Organic-N source was poultry manure. All poultry manure treatments were
applied during soil preparation. Data showed that all growth parameters of onion plants
increased as the fraction of poultry manure increased. Zn had also a positive effect on
all plant parameters except of plant length, and leaf dry weight. The interactive effect of
Zn and poultry manure increased yield and quality of onion bulbs. The most effective
treatments on bulb fresh weight, total yield and quality were the spraying with 1 or 2
ppm zinc and the application of N as 75% mineral and 25% organic, in both seasons

Keywords

Arab Universities Journal of Agricultural Sciences
Volume 13, Issue 3
September 2005
Pages 863-875

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