Effect of Nitrogen Fertilizer on Light Interception and Light Extinction Coefficient in Different Wheat Cultivars

Document Type : Research Article

Authors

• F Samadiyan
• A Soleymani

Islamic Azad University, Isfahan

10.22067/gsc.v14i1.33343

Abstract

Introduction
Wheat (Triticum aestivum) is a cereal grain, originated from the levant region of the near east and Ethiopian highlands, currently cultivated worldwide. Light extinction coefficient K is a coefficient that represents the amount of light reduced by the plant. Light or radiation extinction coefficient is a concept that expresses the light penetration decrease into the canopy in the way the upper leaves of the canopy with less angles have lower amount of K in comparison with the horizontal leaves. Green et al., (2003) stated that nitrogen fertilizer increased light absorption by plant leaves; and affects the yield. The distribution patterns of nitrogen allocation in leaves are more exposed therefore photosynthesis rate per unit leaf area and canopy were optimized. Differences in canopy structure by the light extinction coefficient (k) of the Act Lambert - Beer is described, along LAI differing due to different species and genotypes which are important factors in absorption and light use efficiency. This experiment was performed to evaluate the maximum light absorption and light extinction coefficient in different levels of nitrogen usage and wheat cultivars.
Materials and Methods
An experiment was conducted during 2011-2012 on a research farm of Islamic Azad University, Isfahan Branch, located in Khatoon Abad Village (northern latitude of 320 and 40´ and eastern longitude of 510 and 48´ with altitude of 1555 m above sea level). A split plot layout within randomized complete block design was used with three replications. Main plots were consisted in four levels of N fertilizer (0, 50, 100 and 150 kg ha-1) from an urea source in main plots and different cultivars of wheat included Pishtaz, Sepahan and SW-486 in sub plots. Planting was performed on 14 November 2011 and at a density of 400 plants per square meter. In order to strengthen the land and required elements for plant regarding soil test and treatments based on the test plan, the amount of a third off chemical fertilizer of urea, 46 % Nitrogen was given to the plant and two third by the end of clawing the plot. In the period of growing in order to control brushes 2, 4, D herbicide and Fenitrothion insecticidal was used for countering the louse pest and other insects. In the laboratory, leaf area was measured using scanner and 4.Image 0.2 software program. To determine changes of growth indices, regression relations were used. Total dry matter, leaf area index, net assimilation rate, crop growth rate, light interception extinction were measured.
Results and Discussion
The results showed that the effects of N fertilizilation were significant on the maximum leaf area index, total dry matter and light interception percent were related to Pishtaz cultivar and 150 kg N ha-1 fertilizer treatment significantly resulted Maximum light interception percent, net assimilation rate, with other treatments. Effects of cultivar were significant on maximum light absorption. The Maximum absorption of light, crop growth rate, total dry matter was related to Pishtaz. The interaction between nitrogen and the harvest index was significant at the five percent level. The evidence showed that higher light interception in plants, is associated with the higher performance of plant. The increase of light interception promote the biological and economic performance.
Conclusions
The results showed that application of 150 kg nitrogen per hectare, with the highest level of leaf area index and higher light absorption caused higher extinction coefficient of light in the canopy. Nitrogen fertilizer consumption increased light absorption by leaves, therefore the light extinction coefficient consuming more nitrogen in the plant community. The Maximum absorption of light, crop growth rate, total dry matter was related to pishtaz. Scale of light extinction coefficient for fertilizer treatment control, 50, 100, 150 kg ha-1, was 0.4675, 0.4794, 0.4858 and 0.495, respectively and for Pishtaz, Sepahan and SW-486 cultivars 0.488, -0.4618 and -0.4504, respectively. The results indicated that the application of 150 kg nitrogen per hectare, provides the highest level of morphological characteristics of the plant for producing the highest level of dry matter. Nitrogen fertilizer increased with increasing total plant dry matter. Treatment of 150 kg N per hectare, with the highest plant height, leaf area index and light absorption led to the highest growth rate and resulted in the highest biological and grain yield. The results indicated that 150 kg nitrogen fertilizer treatment for Pishtaz under similar climatic conditions with the present study produces maximum amount of growth indicators.

Keywords

• Crop Growth Rate
• Leaf Area Index
• Net assimilation rate

20.1001.1.20081472.1395.14.1.5.2

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References

1. Akmal, M., and Janssens, M. 2004. Productivity and light use efficiency of perennial ryegrass with contrasting water and nitrogen supplies. Field Crops Research 88: 143-155.

2. Austin, R. B., Bingham, J., Blackwell, R. D., Evans, L. T., Ford, M. A., Morgan, C. L., and Taylor, M. 1992. Genetic improvements in winter wheat yields and associated physiological changes. Journal of Agriculture Science Cambridge 94: 673-689.

3. Board, J. 2000. Light interception efficiency and light quality affect yield compensation of soybean at low plant population. Crop Science 40: 1285-1294.

4. Bonhomme, R. 2000. Beware of comparing RUE values calculated from PAR vs. solar radiation or absorbed vs. intercepted radiation. Field Crops Research 68: 247-252.

5. Dreccer, M. F., Schapendonc, A. H. C. M., Salfer, G. A., and Rabbinge, R. 2000. Comparative response of wheat and oilseed rape to nitrogen supply: absorption and utilization efficiency of radiation and nitrogen during the reproductive stages determining yield. Plant and Soil 220: 189-205.

6. Flent, F., Kiniry, J. R., Board, J. E., Westgate, M. E., and Reicosky, D. C. 1996. Row spacing Effects on Light Extinction coefficients of corn, sorghum, soybean and sunflower. Agronomy Journal 88: 185-190.

7. Garofalo, P., and Rinaldi, M. 2015. Leaf gas exchange and radiation use efficiency of sunflower (Helianthus annuus L.) in response to different deficit irrigation strategies: From solar radiation to plant growth analysis. European Journal of Agronomy 64: 88-97.

8. Gheybi, M. 1999. The need to optimize the fertilizer for increasing yield and improving the quality of maize. Technical Bulletin No. 44. Promotion of agricultural research institute of soil and water. Tehran, Iran. (In Persian).

9. Green, D. S., Erickson, J. E., and Kruger, E. L. 2003. Foliar morphology and canopy nitrogen as predictors of light-use efficiency in terrestrial vegetation. Agricultural Forest Meterology 115: 163-171.

10. Imam, Y. 2004. Cereal crops. Shiraz University Press. (in Persian).

11. Imam, Y., and Niknezhad, V. 2004 .Introduction on and plant and crop physiology (Translation). Danshah Shiraz Press. (in Persian),

12. Kazemi, A. 1999. Private agriculture. 1st Edition. Tehran: Center of Tehran University Press. (in Persian).

13. Khodabande, N. 2005. Cultivation of crops. Tehran: Tehran University Press. (in Persian).

14. Khoshgoftar Manesh, H. 2007. Evaluation of plant nutrition and fertilizer management. Jihad Daneshagahi, Industrial University of Isfahan. (in Persian).

15. Kiniry, J. R., Landivar, J. A., Witt, M., Gerik, T. J., Cavero, J., and Wade, L. J. 1998. Radiation use efficiency response to vapor pressure deficit for maize and sorghum. Field Crops Research 56: 265-270.

16. Koutroubas, S. D., Papkosta, D. K., and Doitsinis, A. 2008. Nitrogen utilization efficiency of safflower hybrids and open-pollinated varieties under Mediterranean conditions, Field Crops Research 107: 56-61.

17. Major, D. J., and Otegu, B. W. 1996. Leaf erea light interception and development in maize radiation use efficiency. Agronomy Journal 83: 895-903.

18. Malakouti, M. J., and Homaee, M. 2004. Arid and semi-arid soil fertility. 2nd edition, Tehran Tarbiat Modarres University Press. (in Persian).

19. McCullough, D. E., Girandin, O., Mihajlovic, M., Aguifra, A., and Tollenaar, M. 1994. Influence of N supply on development and dry matter accumulation of an old and new maize hybrid. Canadian Journal Plant Science 74: 471-477.

20. O’Connell, M. G., O’Leary, G. J., Whitfield, D. M., and Connor, D. J. 2004. Interception of photosynthetic ally active radiation and radiation-use efficiency of wheat, field pea and mustard in a semi-arid environment. Field Crops Research 85: 111-124.

21. Siddique, K. H. M., Tennant, D., Perry, M. W., and Belford, R. K. 1990. Water use and water use efficiency of old and modern wheat cultivars in a Mediterranean-type environment. Australian Journal of Agricultural Research 41: 431-447.

22. Soleymani, A., Khajepour, M. R., Noormohamadi, G. H., and Sadeghyian, Y. 2003. Effect of planting date and pattern on some physiological growth indices of sugar beet. Journal of Agricultural Science 9 (1): 105-123. (in Persian with English abstract).

23. Thomas, S. M., and Thorne, J. N., 1975. Effect of nitrogen fertilizer on photosynthesis and ribulose 1, 5-diphosphate carboxylase activity in spring wheat in the field. Journal of Exp. Botany 26: 43-51.

24. Tunusa, I. A. M., Siddique, K. H. M., Belford R. K., and Karimi, M. 1993. Effect of canopy structure on efficiency of radiation interception and use in spring wheat cultivars during the pre-anthesis period in a Mediterranean-type environment. Field Crops Research 35: 113-122.

25. Werker, A. R., and Jaggard, K. W. 1998. Dependence of sugar beet yield on light interception and evapotranspiration. Agricultural and Forest Meteorology 89: 229-240.