EFFECT OF WATER DEFICIENCY STRESS, LEVELS OF NITROGEN AND PLANT DENSITY ON GROWTH INDICES OF GRAIN CORN (ZEA MAYS L.) HYBRID SC. 704 UNDER KHUZESTAN-RAMIN CONDITIONS

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LACK SH.; MODHEJ A.; ALAVI FAZEL M.; MOJADAM M.; GOHARI M.

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Journal: CROP PHYSIOLOGY Year:2010 | Volume:2 | Issue:2 Page(s): 45-66

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Title

EFFECT OF WATER DEFICIENCY STRESS, LEVELS OF NITROGEN AND PLANT DENSITY ON GROWTH INDICES OF GRAIN CORN (ZEA MAYS L.) HYBRID SC. 704 UNDER KHUZESTAN-RAMIN CONDITIONS

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Keywords

CORNQ2

WATER DEFICIENCY STRESSQ2

NITROGENQ2

PLANT DENSITY AND GROWTH INDICESQ3

Abstract

In order to study the effect of different levels of NITROGEN and plant population under different moist conditions on growth indices of grain CORN (Zea mays L.) SC.704 a field experiment was conducted during 2008 and 2009 cropping seasons in Natural Resources and Agricultural Sciences University of Khuzestan, Ahvaz, Iran. This research in each year was made based on three split-plot field experiments, RCBD. Each of the irrigation treatments implemented separately in each experiment was Optimum irrigation (I1), Moderate stress (I2) and Sever stress (I3) (irrigation based on depletion of 30%, 40% and 50% of field capacity, respectively). Until 4 to 5 leaf stage (seedling establishment stage) irrigations applied after depletion of 30% field capacity in all treatments and after this stage irrigation treatments was applied. In each experiment three NITROGEN levels (N 1=140, N 2=180 and N 3=220 kgN ha-1) were applied in main plots and subplots which consisted of three plant population (D 1=6, D 2=7.5 and D 3=9 plant. m-2). There were three replications for each experiment. Results indicated that the effect of WATER DEFICIENCY STRESS, NITROGEN, and plant population on leaf area index, leaf area index of ear, above and under of ear at silking stage was significant. Leaf area index of ear, above and under of ear decreased as drought stress intensified. The highest leaf area index (4.9) was related to optimum irrigation. Decrease in relative water content of leaves caused decrease in growth and development of leaves and therefore, leaf area index reduced. Leaf area index increased significantly with increased NITROGEN rate application. The positive effect of NITROGEN application on leaf area index were considerably decreased as soil moisture content reduced. The increase of plant population, especially in optimum irrigation condition, caused a significant increase in leaf area index.As the highest leaf area index (5.4) obtained from 9 plant. m-2 at optimum irrigation treatment. The relative water content of ear increased significantly as WATER DEFICIENCY STRESS intensified and plant population increased, although differences between NITROGEN levels for this trait was not significant. The highest and the lowest crop growth rate, relative growth rate and net assimilation rate obtained in optimum irrigation and severe drought stress treatments, respectively. The response of studied indices to the NITROGEN application rate was positive. As plant population increased, crop growth rate increased but net assimilation rate declined, and relative growth rate remained unchanged. The results showed that selecting suitable treatments and change in leaf area index can cause plant growth increase and high yield access.

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APA: Copy

LACK, SH., MODHEJ, A., ALAVI FAZEL, M., MOJADAM, M., & GOHARI, M.. (2010). EFFECT OF WATER DEFICIENCY STRESS, LEVELS OF NITROGEN AND PLANT DENSITY ON GROWTH INDICES OF GRAIN CORN (ZEA MAYS L.) HYBRID SC. 704 UNDER KHUZESTAN-RAMIN CONDITIONS. CROP PHYSIOLOGY, 2(2), 45-66. SID. https://sid.ir/paper/174369/en

Vancouver: Copy

LACK SH., MODHEJ A., ALAVI FAZEL M., MOJADAM M., GOHARI M.. EFFECT OF WATER DEFICIENCY STRESS, LEVELS OF NITROGEN AND PLANT DENSITY ON GROWTH INDICES OF GRAIN CORN (ZEA MAYS L.) HYBRID SC. 704 UNDER KHUZESTAN-RAMIN CONDITIONS. CROP PHYSIOLOGY[Internet]. 2010;2(2):45-66. Available from: https://sid.ir/paper/174369/en

IEEE: Copy

SH. LACK, A. MODHEJ, M. ALAVI FAZEL, M. MOJADAM, and M. GOHARI, “EFFECT OF WATER DEFICIENCY STRESS, LEVELS OF NITROGEN AND PLANT DENSITY ON GROWTH INDICES OF GRAIN CORN (ZEA MAYS L.) HYBRID SC. 704 UNDER KHUZESTAN-RAMIN CONDITIONS,” CROP PHYSIOLOGY, vol. 2, no. 2, pp. 45–66, 2010, [Online]. Available: https://sid.ir/paper/174369/en

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