Effect of Drought Stress, Different Levels of Nitrogen and Potassium Fertilizer on Some Physiological and Agronomical Traits of Maize hybrid (Zea mays L. CV. Single cross 704)

Subject Areas : Journal of Plant Ecophysiology

Reza Rezaei Sokht-Abandani ¹ ( Department of Agronomy, Khuzestan Science and Research Branch, Islamic Azad University, Ahvaz, Iran )
Seyed Ata Siadat ² ( Department of Agronomy, Ramin Branch, Agricultural and Natural Resources University, Ahvaz, Iran )
Alireza pazoki ³ ( Department of Agronomy and Plant breeding, Yadegar-e-Imam Khomeini (RAH) Shahre-rey Branch, Islamic Azad University, Tehran, Iran )
shahram lack ⁴ ( Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran )
mani mojddam ⁵ ( Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran )

Received: 2018-03-11 Accepted : 2018-10-24 Published : 2020-03-20

Keywords: Drought stress, Grain yield, Relative water content, corn, Nitrogen and Potassium,

Abstract :

Abstract:In order to study the effect of drought stress, different levels of nitrogen and potassium fertilizers on the growth of corn this research were done at the agricultural research center of biokola (Neka) during two years 2015 and 2016. The experiment was conducted as split factorial in a completely randomized block design with three replications on S.C704. The main factor was 4 levels of drought stress (irrigation after 75, 100, 125 and 150 millimeter evaporation from class A evaporation pan) and the sub-factor three levels of nitrogen (80, 160 and 240 kg.ha-1) and three levels of potassium (75, 150 and 225 kg.ha-1) were considered.The mean comparison results showed that with increasing nitrogen and potassium consumption, the harvest index decreased by 30.52%. Also, the lowest nitrogen removal index under the interaction of irrigation × nitrogen irrigation intervals with irrigation intervals of 150 mm evaporation from class an evaporation 240 kg N/ha decreased by 30.91%.The highest relative leaf water content and leaf chlorophyll content were obtained for irrigation intervals of 75 mm with kg.N.ha-1, 94.12% and 61.59%, respectively.Also, the highest grain and nitrogen yield were obtained for the second year in 75 mm irrigation interval and 240 kg.N.ha-1 with average 12807 kg/ha and 2.72%, respectively. So after increasing in drought stress, nitrogen and potassium, the traits as harvest index and nitrogen removal index decreased.

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