دور حامض البرولين في تحسين حاصل زهرة الشمس و مكوناته تحت ظروف الشد المائي

Abstract EN

A field study was conducted during the spring and autumn seasons of 2014 at the experimental farm of Field Crop Department, College of Agriculture (Abo-Ghraib) - University of Baghdad, to study the effect of Irrigation deficiency quantities and concentrations of Proline acid on yield , its components, water consumptive and water use efficiency of sunflower (Helianthus annus L.

) for Luleo hybrid.

Randomized Complete Block Design (RCBD) in arrangement of a split-plot with three replications were used.

Irrigation treatments, control (depletion 50% of available water) and 60% , 50% 40% of control treatment, were assigned as a main plots.

while proline acid concentrations of 0, 30, 60 and 90 mg.L-1 were assigned as a subplots.

The results showed that there is no significant differences between the control treatment and 60% of the control for the period from planting to 50% flowering, number of leaves, relative water content, nitrogen concentration in leaves, fertilization percentage, number of seeds in the head,100 seed weight and seeds yield reaching 3.90, 2.46 t.ha-1 and 3.78 , 2.41 t.ha-1 for spring and autumn seasons respectively.

which indicates the possibility of saving 40% of the water consumption which is estimated 1920.00, 2960.00 m3.

ha-1.

Season-1 for two seasons respectively without any yield reduction.

While the percentage of decline in seeds yield for treatments 50% and 40% from the control treatment for spring season were 14.61% , 19.74% respectively and 21.95 % , 33.33% for autumn season comparing with control.

Irrigation treatment 40%, 60% of the control treatments gave the best water use efficiency for both seasons respectively.

a concentrations of Proline acid affect significantly most of studied traits.

Increasing of Proline to 60mg.L-1 gave the to increase in fertilization percentage was 70.20ٗ 81%.

100 seed weight 7.52ٗ 7.12gm, seed yield 3.75, 2.21 t.ha-1 and water use efficiency 0.29ٗ 0.84 kg seed.m-3 water comparing with control for two seasons respectively .The interaction between irrigation and Proline acid showed a significantly effect on all characteristics seeds yield components traits in both seasons.

We therefore recommend that in case of limited irrigation water by %60 by the need of the full irrigation (50 % depletion of available water) without a significant decrease in product seed yield, in addition to possibility treatment of sunflower plants with Proline acid with 60 mg .L-1 to improvement capacity of water stress.