EFFECT OF DIFFERENT LEVELS OF N AND K FERTILIZERS ON GROWTH AND YIELD OF ONION  ( Allium cepa L. ) GROWN IN THE SOUTH OF IRAQ / BASRAH

	EFFECT OF DIFFERENT LEVELS OF N AND K FERTILIZERS ON GROWTH AND YIELD OF ONION ( Allium cepa L. ) GROWN IN THE SOUTH OF IRAQ / BASRAH
AL-TAQANI
Article 1, Volume 18, Issue 3, 2005, Pages 0-0
Abstract
The experiment was conducted during winter seasos of 2001/ 2002 and 2002/2003 at Safwan / Zubair – Basrah. The aim of the experiment was focused on the effect of nitrogen and potassium fertilizer levels ( 0, 20, 40 ) kg/donum for each of them on the vegetative growth, yield and quality of the local red onion variety. Results show that , nitrogen fertilizer level of (40) kg gave significant increase in the length leaf blade, d bulb diameter and yield (5.11 and 5.3 ton / donum) and dry matter percentage (12.3% and 12.1% ). Potassium fertilizer level of ( 20 ) kg gave significant increase in the yield ( 5.24 and 5.31 ton / donum) and percentage of total nitrogen in the bulbs( 3.15% and 3.4% ) for the two seasons respectively. The interaction between the application of nitrogen at (40) kg and potassium at (20) kg gave significant increase in length of leaf blade, bulb diameter, total yield and total nitrogen in the bulbs, whereas (51.0 cm,51.0 mm,5.72tons/domun,and 3.85%),the interaction between 20 kg/donum potassium gave the best results in bulb diameter that was 52.3 mm in the first season 2001-2002 , while in the second season 2002-2003 the application of 40 kg/donum nitrogen and 40 kg/donum potassium gave 49.1 cm and 51.7 mm results in length of blade and bulb diameter. On the other hand, the application of 40 kg/donum nitrogen and 20 kg/donum potassium gave the best results in features of the total production and the percentage of total nitrogen that was 5.42 tons/donum and 3.69%.

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