Effect of foliar application with Urea and CO2 enrichment on some growth characteristics and mineral content of sour orange seedlings.

Abstract

The influence of foliar application with urea and CO2 enrichment on growth characteristics and mineral content of 6 month old sour orange seedlings, grown under nursery condition was investigated from November 2012 to Desember 2013 .Three urea levels were used : 0(spray with distilled water), 0.5% and 1%.The transplants also exposed to three CO2 levels, near that of ambient air (0.0390%), supplied saplings with additional CO2 levels above the ambient air 0.0690% and 0.0990%.The results showed that spraying with 1% urea increased significantly all the vegetative characteristics (leaves number, leaves area, branch number, stem diameter, total vegetative and root dry weight, mineral content of leaves, chlorophyll content and branches total carbohydrate). Elevated CO2 level to 0.0990 % increased all vegetative parameters, potassium, phosphour and total carbohydrate, whereas transplants grown under ambient air (0.0390%) contained the highest chlorophyll and nitrogen leaf contents.