The effect of plant density and nitrogen fertilizer on leaf area, chlorophyll, and grain protein of Zea mays in competition with Amaranthus retroflexus

Subject Areas : Plant Physiology

Mojtaba  Fateh ¹ (Department of agriculture, Islamic Azad University, Tabriz Branch, Tabriz, Iran.)
Hamdollah  Kazemi Arbat ² (Department of agriculture, Islamic Azad University, Tabriz Branch, Tabriz, Iran.)
Soleyman  Mohammadi ³ (Agricultural Research Center, , Miandoab, Iran)
Farhad  Farahvash ⁴ (Department of agriculture, Islamic Azad University, Tabriz Branch, Tabriz, Iran.)
Eskandar  Zand ⁵ (Agronomy Pest and Disease Research Institute, Tehran, Iran)

Received: 2021-06-29 Accepted : 2021-07-03 Published : 2021-04-01

Keywords: Protein, Maize, Fertilizer, weed, leaf,

Abstract :

In order to investigate the effect of plant density and different amounts of nitrogen fertilizer on yield components, leaf area, chlorophyll and grain protein content of Zea mays cultivars and Amaranthus retroflexus biomass. The experiment was conducted in two crop years (2012-2013) in the form of a split plot based on a randomized complete block design with four replications. The main factors included maize cultivars (single cross hybrids of 370 and 704) and sub factors included different levels of maize densities (60000, 70000, 80000 and 90000 plant ha-1) and different levels of nitrogen fertilizer including 200, 300, 400 and 500 kg ha-1. The effect of density on all traits was significant, but the effect of cultivar on chlorophyll and leaf area index and nitrogen effect on number of ear per square meter were not significant. Maize cultivar of 704 had significantly higher number of grain per ear, weight of one thousand grains and grain protein compared to cultivar 370 but the number of ear was significantly lower than that of cultivar 370 and there was no significant difference in chlorophyll content and leaf area index between the two cultivars. The highest grain protein was obtained at densities of 80000 plant ha-1 and application of 400 kg ha-1 N. Also, cultivar 704 significantly decreased redroot biomass compared to cultivar 370. According to the results, recommended to farmers in Miandoab region to use cultivar 704 with a density of 80,000 plant ha-1 along with 400 kg N ha-1.

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