Moradi Talebbeigi, R., Kazemeini, S. A., Ghadiri, H. (2018). Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency. , 20(7), 1455-1466.
R. Moradi Talebbeigi; S. A. Kazemeini; H. Ghadiri. "Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency". , 20, 7, 2018, 1455-1466.
Moradi Talebbeigi, R., Kazemeini, S. A., Ghadiri, H. (2018). 'Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency', , 20(7), pp. 1455-1466.
Moradi Talebbeigi, R., Kazemeini, S. A., Ghadiri, H. Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency. , 2018; 20(7): 1455-1466.

Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency

Journal of Agricultural Science and Technology
Article 11, Volume 20, Issue 7, 2018, Pages 1455-1466    PDF (619.26 K)
Authors
R. Moradi Talebbeigi; S. A. Kazemeini* ; H. Ghadiri
Department of Crop Production and Plant Breeding, School of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
Abstract
A 2-year field experiment was conducted to evaluate the effect of N sources [Ammonium Nitrate (AN), Ammonium Sulfate (AS), Sulfur Coated Urea (SCU), and Urea (U)] and split application ((1/4,3/4,0), (1/3,1/3,1/3), (1/2,1/2,0), and (1/3,2/3,0)) on weed growth, safflower (Carthamus tinctorius L.) yield, and N Use Efficiency (NUE), using a split split-plot design with three replications, at the Experimental Research Station of Shiraz University, in 2015 and 2016. In weedy plots, applying AN-fertilizer in a split pattern of 1/2,1/2,0 (applying half of the N at sowing time and the rest at stem elongation) increased weed infestation. This treatment enhanced total weed N Uptake Efficiency (NUpE) up to 5% compared to U-fertilizer and similar split pattern. In weed free plots, the highest seed and oil yields (3303.52 and 753.09 kg ha-1, respectively) were achieved by AN- and U-fertilizers in a split pattern of 1/2,1/2,0. Applying AN fertilizer and split patterns of 1/3,2/3,0 (one third of N at sowing and two thirds at stem elongation) and 1/4,3/4,0 (one quarter of N at sowing and three quarters at stem elongation) maximized safflower NUpE (0.78 kg kg-1). Applying U fertilizer and split pattern of 1/2,1/2,0 increased safflower ability to compete vs. weeds up to 20% compared to AN-fertilizer. Overall, in order to improve safflower yield and NUE and control weed, applying U-fertilizer and split application of 1/3,2/3,0 or 1/4,3/4,0 can be suggested as a component of integrated weed management programs.
Keywords
Ability to compete index; Fertilizer management; Nitrogen efficiency; Redroot pigweed
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