Mohammad Bakhshian1*, Hossein Heidari Sharifabad2 1- Agriculture University of Jiroft, Kerman, Iran 2- Department of Agriculture (Crop Physiologist), Science and Research University, Branch of Tehran,Iran *Corresponding author Email: m.bakhshian@yahoo.com Received: 2 June 2015 Accepted: 21 June 2015 Abstract To evaluate the effect of different nitrogen fertilizer on morphological properties of biomass of different corn cultivars, a field experiment was performed in a farm located in Kabutarabad area of Esfahan in 2014. Experiment was conducted in split plot design in complete randomized blocks layout with three replications. Different levels of nitrogen fertilizer in four levels of 100, 150, 200 and 250 Kg ha-1 of pure nitrogen from urea source and different varieties SC500, SC604, SC 700 and SC704 were considered as main and sub plots. The highest dry weights of leaf, stem and plant were obtained in 250 Kg N ha-1 treatment. SC704 due to longer growing period had the highest leaf, shoot, and plant dry weights relative to the other single crosses. With regard to sustainable agriculture and optimizing the use of fertilizer it seems under the same conditions of this study SC704 and 250 Kg ha-1 of nitrogen would give the best performance. Manuscript profile

EBRAHIM PANAHPOUR1*, PARVIZ AHMADI2, MAHMOUD SHOMEILI3 1,2- Department of Soil Science, College of Agriculture, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran 3- Manager Agronomi Department Sugarcane Research and Training Institute Khuzestan, Iran *Corresponding Author Email: e.panahpour@gmail.com Received: 22 July 2015 Accepted:2 November 2015 ABSTRACT Plant nutrition as an affecting factor is a function of the interaction between nutrients and environmental conditions. Therefore, accurate determination of nutrient elements required for plant growth involves a scientific method based on measurements. In order to study the effects of main nutrient elements namely potassium, nitrogen, phosphorus, and sulfur and the nutritional uptake of sugarcane, an experiment was carried out in a complete randomized block design with 15 treatments each with three replications in Imam Khomeini Agro-industry Research Farm, Khuzestan during 2013-2014. The treatments were the applications of basic fertilizers including diammonium phosphate (DAP), nitrogen phosphate sulfate (NPS) and sulfuric nitrogen-potassium phosphate (NPSK), each in two levels of 500 and 700 kg per hectare as well as two varying amounts of topdress types of liquid organic fertilizers commercially named Sanko and APEX. A topdress urea fertilizer (350 kg) was used in all the treatments with three installments (within a 1.5-month interval). Analysis of variance showed significant differences for studied traits among all treatments. Accordingly, the treatments were significantly (p<0.05) different in the contents of potassium, nitrogen and phosphorus but not in the sulfur content of the leaves. The potassium content of leaf was highest in the treatment of 500 kg/ha baseline DAP (with mean = 0.366%). The largest nitrogen content of leaves was obtained in the treatment of 700 kg/ha baseline NPS (with mean = 2.108%), and the greatest phosphorus content was observed in the treatment of 250 kg/ha baseline DAP plus 21 kg/ha of APEX organic fertilizer (with mean = 0.750%). Manuscript profile