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Vertical Profile of Leaf Nitrogen Distribution at Different Densities of Plant And Different Levels of N Fertilizer on Corn Hybrids Canopy

Author

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  • Soraya Ghasemi
  • Ali Reza Kochaki
  • Mehdi Nassiri Mahalati
  • Rajab Choukan

Abstract

In this study, the distribution of leaf nitrogen of two corn hybrids during the growing season, in response to the density and N supply were studied. There were two corn hybrids (S.C. 704 and maxima (MV 524)) under three levels of nitrogen- Recommended (300 kg N/ha); RDN plus 25% (375 kg N/ha); RDN plus 50% (450 kg N/ha) and were three levels of population. Recommended (RDN) (7 plants m-2); RDN plus 10% (7.7 plants m-2); RDN plus 20% (8.4 plants m-2).Regular samplings were made from 40 days after sowing until crop maturity. Every 2 weeks, a 1 m2 sample of the canopy was cut in four successive vertical layers of equal thickness. Leaf area and N concentration (%) in each layer were measured. The vertical N gradient became more marked with ongoing vegetative development. The whole canopy photosynthetic benefit that would accrue from maintaining the N gradient is likely to be accentuated. The rate of decline in leaf N concentration in a layer was not related to either the initial concentration in the leaves within the layer.

Suggested Citation

  • Soraya Ghasemi & Ali Reza Kochaki & Mehdi Nassiri Mahalati & Rajab Choukan, 2016. "Vertical Profile of Leaf Nitrogen Distribution at Different Densities of Plant And Different Levels of N Fertilizer on Corn Hybrids Canopy," Modern Applied Science, Canadian Center of Science and Education, vol. 10(12), pages 1-57, December.
    • Handle: RePEc:ibn:masjnl:v:10:y:2016:i:12:p:57
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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