EVALUATION OF EXTINCTION COEFFICIENT AND RADIATION USE EFFICIENCY IN DIFFERENT CULTIVARS OF SAFFLOWER UNDER DIFFERENT LEVELS OF NITROGEN (N) FERTILIZER

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MASOMIPOUR A.; TORABI B.; RAHIMI A.

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Journal: Crop Production Year:2016 | Volume:9 | Issue:3 Page(s): 67-86

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Title

EVALUATION OF EXTINCTION COEFFICIENT AND RADIATION USE EFFICIENCY IN DIFFERENT CULTIVARS OF SAFFLOWER UNDER DIFFERENT LEVELS OF NITROGEN (N) FERTILIZER

Author(s)

MASOMIPOUR A. | TORABI B. | RAHIMI A. | Issue Writer Certificate

Keywords

LEAF AREA INDEXQ2

LIGHT EXTINCTION COEFFICIENTQ2

NITROGENQ2

RADIATION USE EFFICIENCYQ2

SAFFLOWERQ2

Abstract

Background and objectives: There is a high correlation between crop growth and the rate of radiation interception. The efficiency of radiation interception and absorption is dependent on LEAF AREA INDEX, LIGHT EXTINCTION COEFFICIENT and RADIATION USE EFFICIENCY. To study extinction coefficient and RADIATION USE EFFICIENCY in different cultivars of SAFFLOWER under different levels of N fertilizer, an experiment was carried out in the research field at the University of Valiasr in Rafsanjan during 2013-2014.Materials and methods: Experiment was arranged in a split plot design in complete randomized block design with four replications. Experiment factors including N fertilizer were a main factor in 5 levels (control, 50, 100, 150 and 200 kg per hectare) and cultivar in 4 levels (Local Isfahan, Goldashat, Sofe and Naeen). In addition to measuring the radiation above and under the canopy, the plots were sampled 8 times during growing season and LEAF AREA INDEX, total dry matter and finally LIGHT EXTINCTION COEFFICIENT and RADIATION USE EFFICIENCY (RUE) were measured.Results: The results showed that LIGHT EXTINCTION COEFFICIENT was not affected by N fertilizer but comparison of extinction coefficient in difference cultivars showed that Goldasht cultivar have significant difference with Landrace of Local Isfahan and Sofe and RUE obtained for endemic cultivars of Local Isfahan, Goldasht, Naeen and Sofe were 0.46, 0.54, 0.48 and 0.46, respectively. RADIATION USE EFFICIENCY was influenced by N fertilizer; in this case, at fertilizer level of 150 Kg, there was a significant difference among endemic cultivars of Local Isfahan, Goldasht, Sofe with control. At 200 Kg N level, Naeen cultivar had a significant difference with control for RUE. There was no significant difference in obtained RUE in different cultivars and amount of RUE obtained for endemic cultivars of Local Isfahan, Goldasht, Naeen and Sofe were 4.45, 4.19, 4.62 and 4.35 g MJ-1, respectively. In addition, at 100 Kg h-1 fertilizer level, maximum LEAF AREA INDEX of all cultivars had a significant difference with control level.Conclusion: In this experimental study with increasing the level of N fertilizer, maximum LEAF AREA INDEX increased significantly. Increasing the LEAF AREA INDEX caused RADIATION USE EFFICIENCY affected by N and in general the highest RADIATION USE EFFICIENCY obtained at 100 to 150 Kg h-1 N level. It seemed that among the above cultivars, Naeen is the most suitable for RADIATION USE EFFICIENCY.

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APA: Copy

MASOMIPOUR, A., TORABI, B., & RAHIMI, A.. (2016). EVALUATION OF EXTINCTION COEFFICIENT AND RADIATION USE EFFICIENCY IN DIFFERENT CULTIVARS OF SAFFLOWER UNDER DIFFERENT LEVELS OF NITROGEN (N) FERTILIZER. ELECTRONIC JOURNAL OF CROP PRODUCTION, 9(3), 67-86. SID. https://sid.ir/paper/135216/en

Vancouver: Copy

MASOMIPOUR A., TORABI B., RAHIMI A.. EVALUATION OF EXTINCTION COEFFICIENT AND RADIATION USE EFFICIENCY IN DIFFERENT CULTIVARS OF SAFFLOWER UNDER DIFFERENT LEVELS OF NITROGEN (N) FERTILIZER. ELECTRONIC JOURNAL OF CROP PRODUCTION[Internet]. 2016;9(3):67-86. Available from: https://sid.ir/paper/135216/en

IEEE: Copy

A. MASOMIPOUR, B. TORABI, and A. RAHIMI, “EVALUATION OF EXTINCTION COEFFICIENT AND RADIATION USE EFFICIENCY IN DIFFERENT CULTIVARS OF SAFFLOWER UNDER DIFFERENT LEVELS OF NITROGEN (N) FERTILIZER,” ELECTRONIC JOURNAL OF CROP PRODUCTION, vol. 9, no. 3, pp. 67–86, 2016, [Online]. Available: https://sid.ir/paper/135216/en

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