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A meta-analysis survey of the effects of nitrogen fertilizer on the yield and some morphological traits of oil sunflower in Iran and the world
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| Author:
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MOHSEN REZAEE, MOHAMMAD NABI ILKAEE, SAEED SOUPHIZADEH, FAYAZ AGHAYARI, ABDOLMAJEED MAHDAVI DAMGHANI
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| Abstract:
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The large amount of researches regarding the effect of different levels of nitrogen on economic characteristics
of sunflower in Iran and the world have needed a sum up, which is made possible by meta-analysis. Therefore,
in this research the meta-analysis of the effects of nitrogen fertilizer on some of important economic
characteristics was performed, which were found in 36 chosen scientific and research papers published from
1995 to 2018 in Iran and the world. Using meta-regressions, we find that in the range of nitrogen used (80-161
kg. ha-1), the highest seed yield (SY) (5600.58 kg.ha-1), head diameter (HD) (24cm), plant height (PH) (200.11cm),
1000 -seed weight (TSW) (115.72), number of seeds per head (NSH) (1855.11), seed oil percentage (SOP) (%58)
were gained in the highest level of nitrogen. We also show that an increase in the linear trend of the total yield
(TY), TSW, HD, PH, and NSH. Though the trend of linear changes of the SOP was reduced. Our results showed
with the increase of nitrogen fertilizer (161-240kg.ha-1) did not have any effects on yield component, SOP
therefore the best of rang nitrogen consumption considered 81-160kg.ha -1 range.
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| Keyword:
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meta-analysis; sunflower; nitrogen; seed yield; yield components; oil percent
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| EOI:
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-
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| DOI:
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https://doi.org/10.31838/ijpr/2021.13.01.769
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| Download:
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