EFFECT OF WATER SALINITY AND GIBBERELLIC ACID ON LEAF AREA AND WHEAT YIELD COMPENET

	EFFECT OF WATER SALINITY AND GIBBERELLIC ACID ON LEAF AREA AND WHEAT YIELD COMPENET
Diyala Agricultural Sciences Journal
Article 1, Volume 9, Issue 2, 2017, Pages 146-157
Abstract
The experiment was carried out at Diyala Directorate of Agriculture Research Station field crops during the winter season 2013-2014. The aim was to study the effect of gibberellic acid foliar on wheat crop tolerance to levels of water salinity at different stages of growth, according to the scale of Zadoks for small grains and its impact on some characteristics; yield and yield components of wheat (IPA 99 var.). Randomized Complete Block design with three replicates using split-plot arrangement was used. The main plots included four levels of water salinity (7, 14, 21 dS m-1 and river water) in both seasons, while sub-plots included gibberellic acid in different concentrations which sprayed according to the stages of crop growth (150, 300 and 450 mg l-1). The results showed negatively effect of water salinity S3 level (21 dS m-1) on the mean of all characteristics, including the grain yield, which gave lower rate 79.00 and 79.60% for two seasons respectively. Gibberellic acid at 450 mg l-1 caused increase flag leaf area, number of spikes, number of grains in spike and yield grain in the two seasons respectively. The interaction between river water and gibberellic acid foliar at 450 mg l-1 (S0G3 ) also recorded the highest average area of flag leaf, number of grains per-spike, 1000-grain weight and yield grain in the two seasons. The combination S1G3 (salinity level 7 dS m-1 and gibberellic acid foliar at 450 mg l-1) excelled number of spikes in the first season. Combination S3G0 (salinity level 21 dS m-1 without gibberellic acid) recorded the lowest average area of flag leaf, number of spikes, number of grains per-spike and grain yield for two seasons.
Keywords
Gibberellic acid; salinity; wheat

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