EFFECT OF POTASSIUM CONCENTRATIONS AND TIMES OF SPRAYING ON GROWTH AND YIELD OF MAIZE.

M.J.Hamza,; A.T.Fissah,; R.Z.ALbeiruty,

	EFFECT OF POTASSIUM CONCENTRATIONS AND TIMES OF SPRAYING ON GROWTH AND YIELD OF MAIZE.
The Iraqi Journal of Agricultural Science
Article 1, Volume 39, Issue 3, 2008, Pages 24-32
Authors
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Abstract
A field experiment was carried out during thc growing season of 2004 and 2005 at the Experimental Station /State Board For Agricultural Research / Abu. Ghraib / Ministry of Agriculture . to study the effect of foliar application of potassium on growth and yield of maize cultivar 5012 .Four concentrations of potassium (0,1000,2000 and 3000 mgk.l-1 ) were sprayed at three different stages of vegetative growth, flowering and grain filling .Results showed that spraying of 2000 mgk.l-1 led to significant increase in autumn 2005 on Weight of 1000 grains 259.6 g .nurnber of rows per ear (18.38) and number of seed per ear (673.56), There was no significant different with 3000 mgk.l-1 concentration that gave significant increase on yield grains 8289 kg/ha .However, time of spraying showed no significant effect on total grain yield. Combination of 2000 mgk.l-1 I concentration of potassium and the time of spraying at the three stages of growing showed a significant increase in autumn 2005 on number of rows per ear and number of seeds per ear and weight of 1000 grains. While grain yield showed the highest averages following the application of 3000 mgk.l-1 concentration at the three stages as compared with control that gave the lowest averages .While the interaction between growth stages for spraying potassium and concentration potassium fertilizer effect significantly on the weight of 1000 grains in 2004 .while grain yield gave highest range with mgk.l-1 at the three stages .The treatment of spraying potassium with 2000 mgk.l-1 •1 concentration at the three stages of growing gave significant increase on the weight of 1000 grains as compared with control that gave lowest average 248.9g.

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