Impact of Split Application of Different N-Fertilizer Sources on Weed Growth, Safflower Yield, and Nitrogen Use Efficiency
Publish Year: 1397
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JASTMO-20-7_011
تاریخ نمایه سازی: 23 آبان 1402
Abstract:
A ۲-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 ((۱/۴,۳/۴,۰), (۱/۳,۱/۳,۱/۳), (۱/۲,۱/۲,۰), and (۱/۳,۲/۳,۰)) 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 ۲۰۱۵ and ۲۰۱۶. In weedy plots, applying AN-fertilizer in a split pattern of ۱/۲,۱/۲,۰ (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 ۵% compared to U-fertilizer and similar split pattern. In weed free plots, the highest seed and oil yields (۳۳۰۳.۵۲ and ۷۵۳.۰۹ kg ha-۱, respectively) were achieved by AN- and U-fertilizers in a split pattern of ۱/۲,۱/۲,۰. Applying AN fertilizer and split patterns of ۱/۳,۲/۳,۰ (one third of N at sowing and two thirds at stem elongation) and ۱/۴,۳/۴,۰ (one quarter of N at sowing and three quarters at stem elongation) maximized safflower NUpE (۰.۷۸ kg kg-۱). Applying U fertilizer and split pattern of ۱/۲,۱/۲,۰ increased safflower ability to compete vs. weeds up to ۲۰% compared to AN-fertilizer. Overall, in order to improve safflower yield and NUE and control weed, applying U-fertilizer and split application of ۱/۳,۲/۳,۰ or ۱/۴,۳/۴,۰ can be suggested as a component of integrated weed management programs.
Keywords:
Ability to compete index , Fertilizer management , Nitrogen efficiency , Redroot pigweed. , شاخص توانایی رقابت , مدیریت کود , کارآیی نیتروژن , تاج خروس
Authors
R. Moradi Talebbeigi
Department of Crop Production and Plant Breeding, School of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
S. A. Kazemeini
Department of Crop Production and Plant Breeding, School of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
H. Ghadiri
Department of Crop Production and Plant Breeding, School of Agriculture, Shiraz University, Shiraz, Islamic Republic of Iran.
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