رقم تگزاس ارلي گرانو )Allium cepal( اثر نيتروژن و برخي از عناصر كم مصرف بر كميت و كيفيت محصول پياز

EFFECTS OF NITROGEN AND MICROELEMENTS ON YIELD AND QUALITY OF ONION (ALLIUM CEPA L.) ʹTEXAS EARLY GRANOʹ

In a field experiment in Jiroft. the effects of soil applied nitrogen (N) and foliar sprayed zinc (Zn), iron (Fe) and copper (Cu) solutions on yield, storability and biochemical parameters of bulbs and also concentration of elements in leaves were studied. Treatments consisted of N (200 or 400 kg ha-1), Zn (2 mg 1-1), Fe (2 mg 1-1) , Cu (1 mg 1-1) and control (water). Compared with 200 kg ha-1. 400 kg ha-1 N had no significant effects on yield, dry matter percentage (DMP) and organic acids (OA). Some microelements increased yield. Fe increased yield up to 19% and 15.5% at 200 and 400 Kg of N, respectively. Combination of 3 microelements increased yield 14.3% and 12.2% at 200 and 400 kg ha- N. respectively. Zn, Fe or Zn-Fe- Cu significantly increased DMP compared to control. Total soluble solids (TSS) were not affected by N treatments whereas Fe or Zn increased this trait significantly. At 400 kg N ha-1. Fe, Zn-Fe or Fe- Zn-Cu increased OA. Storability of onions was negatively affected by N treatments. At 200 kg ha-1 N. Zn. Fe. Zn-Fe or Zn-Fe-Cu increased storabilily. Compared with 400 kg N ha-1 200 kg increased only leaf Fe concentrations and had no effects on the other measured elements. At 400 kg N ha-1 application of microelements increased the boron concentration of leaves.