Evaluation of Phosphorus and Zinc Concentration in Oil and Confectionary Sunflower Plant Parts in Modified Fertilization


   Hamid Madani* Associate Professor in Crop Physiology,
Department of Agronomy and Plant Breeding, Arak Branch, Islamic Azad University,
Arak, Iran   * Corresponding authorE-mail: h-madani@iau-arak.ac.ir    Received: 21
April 2013 Accepted:12
November 2013     Abstract    The sunflower oilseed
and confectionaries types (Helianthus annuus L.) are definitely different
in nutritional responses. This study attempted to
evaluate differences in the expression levels
of phosphorus and zinc arising
from different fertilization treatments. The field experiment was conducted out at
Agricultural Research Centre, in Islamic Azad University Arak, Iran, during
2011. Experiment was laid in split plot in randomized complete block design
with 3 replications. Phosphorus treatments were in main plots and zinc in sub
plots. Phosphorus levels were including 350, 175, 175 kg/ha triple super
phosphate plus
100 g/ha phosphorus solublizing bacteria (PSB) and PSB alone and zinc levels were 0, 25 kg/ha
soil application zinc sulphate, 25 kg/ha soil application of zinc
sulphate plus 10% soluble zinc foliar application and soluble zinc foliar application
alone. The results of roots quality in two sunflowers types showed P
concentration in confectionary sunflower roots in all zinc levels was significantly
higher. Use of 175 kg/ha triple super phosphate plus phosphorus solubilising
bacteria (P < /font>3( or utilization of pure PSB (P < /font>4) in test plots was one
of the main cause to increase phosphorus concentration in sunflower roots in
check plots for zinc (Z1). Leaf phosphorus content was sharply
higher in confectionary sunflower when fertilized with phosphorus and zinc
mixture. High P application (P < sub>1) was the main cause for slow
reduction in leaf zinc concentration for oilseed from 40 to 20 mg/kg. However, PSB and chemical phosphate use
(P < sub>3)
and PSB alone (P < sub>4) caused
the leaf zinc content to increase significantly by foliar zinc application (Z4). Furthermore,
the most zinc accumulation
was detected in confectionary sunflower seeds by 55 mg/kg in PSB and chemical
phosphate use treatment plus foliar soluble zinc application (P < sub>3Z4).