Investigation of nitrogen changes in canopy leaves of corn under the influence of planting patterns, plant density and nitrogen split

Document Type : Research Article


Ferdowsi university of Mashhad


In this research, the distribution process of leaf nitrogen in corn canopy during the growing season was investigated under the influence of planting patterns, plant density and nitrogen split. The experiment was split factorial with three replications, including two planting patterns of single-row and double-row as a main plot, three levels of plant density of seven plants per square meter (favorable density), 7.7 plants per square meter (10 percent higher than the optimum density) and 8.4 plants per square meter (20 percent higher than the optimum density) and three levels of nitrogen splitting that were 1.2 at planting time + 1.2 at the time of four to six leaves, 1.3 at planting time + 1.3 at the time of four to six leaves + 1.3 at flowering time and 1.2 at planting time + 1.2 at flowering time as a sub plot (by combined). In growing season, regular sampling of leaf area and dry matter were taken at intervals of every two weeks from 40 days after planting. Corn canopy was divided into four equal layers in terms of and nitrogen concentration per leaf area unit was measured for each layer. The results showed that during the growing season, changes of nitrogen profile in the canopy were strongly influenced by the distribution of nitrogen and plant density. Nitrogen profile has down process in treatment of the same fertilization in two stages of planting and flowering and in a density of 8.4 plants per square meter, during the growing season. With opening of canopy (less density), nitrogen concentration per leaf area unit has a decreasing process in the two lower layers and has an increasing process in the two upper layers. Investigating the triplet interaction of planting pattern, plant density and nitrogen fertilizer splitting on nitrogen use efficiency and dry matter yield of corn showed that the highest nitrogen use efficiency and dry matter yield were observed in single-row planting pattern - plant density 7 and 7.7 plants per square meter. In treatments of single-row planting pattern - plant density of 8.4 plants per square meter and double-row planting pattern - plant density of 7 plants per square meter, splitting of nitrogen fertilizer as1.2 at planting time + 1.2 at flowering time reduced nitrogen use efficiency compared to other two levels of nitrogen splitting.


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Articles in Press, Accepted Manuscript
Available Online from 01 January 2024
  • Receive Date: 23 September 2017
  • Accept Date: 23 September 2017
  • First Publish Date: 27 November 2020