تأثير IBA و Kinetin في حاصل الشوفان (.Avena sativa L)‎ و مكوناته تحت الإجهاد الرطوبي

Abstract EN

In order to study the effect of growth regulators IBA (Soaking seeds) and Kinetin, spraying in booting stage of Oats (Avena sativa L.) on yield and its components, this research was conducted in the fields of field crop department, College of Agriculture, University of Baghdad during two successive winter seasons of 2012-2013 and 2013-2014.

Experiments were laid out with randomized complete block design in a split-plot arrangement with three replications.

Irrigation treatment with three levels, 360 (control), 304, and 228 mm.season-1 (I1, I2 and I3) respectively, were assigned as main plots.

Growth regulators as a second plot (G1, G2, G3 , and G4) where G1 represents control (without application), G2 spraying Kinetin (5ppm) on the plant at booting stage, G3 includes soaking seeds with IBA (1ppm) and spraying kinetin (5ppm) in booting stage , and G4 to soak seeds in IBA (1ppm) only.

Exposing crop to water stress led to decrease in Oats seeds yield by 26 ,13%, respectively.

As the impact of the lack of irrigation water on yield components in inflorescences seeds weight has decreased by 7, and 13% when adding I2 and I3 respectively, in the first season and led to a decline in traits rates by 14, 0.01, and 10% for the number of grains in inflorescence, number of inflorescence per m2 , and inflorescence length when adding I2 Irrigation water rate.

Increasing irrigation rate (I1) increase root to shoot ratio (RSR) by 25 and 27% for both seasons compared with I2 irrigation level.

Root weight increased by 5% in first season subjected to reduction water consumption by 28%, and with increment of WUE by 40% in the first season.

Applying kinetin has significant effect in increasing grain yield by 13 , 7, and 5% in root weight (for one season) and 4 , 11% for grain weight.inflorescences-1, 4 , 6% for number of grains per inflorescences, 7 , 9% for number of inflorescences per m2 , 7% , length of inflorescences (first season), 11% for weight of 1000 seeds (second season), 4, 10%, for, harvest index and 13, 7% for water use efficiency (WUE) respectively.

It can be concluded that using IBA and kinetin had clear compensatory impact on grains yield, yield components, plant root system growth, and on WUE which tend to reduce the negative impact of water stress that Oat crop has been exposed to.