Abstract
In order to investigate the effect of irrigation and nitrogen fertilizer on agronomical and physiological traits of two winter rapeseed varieties, an experiment was established in a randomized complete block design as split-plot factorial arrangement with four replications in 2005-2006 at Agricultural Research Station of Khorramabad, Iran. Irrigation as main-plot factor consisted of four levels (I60, I90, I120 and I150). Sub-plot factors included nitrogen in four levels (N0, N70, N140, and N210 kg N ha(-1)) and two varieties (Zarfam and SLM046). Thousand-seed weight (TSW) in all irrigation and nitrogen levels was lower in the 2006 than that of the 2005. Seed oil percentage (SOP) was decreased with increasing water use only in second year. As nitrogen rate increased, SOP decreased and seed oil yield (SOY) increased in the 2006 significantly (p < 0.05). With increasing water supply, SOY increased in first year. Zarfam variety had a higher TSW and SOP in both years. According to combined analysis results, seed and oil yield were not significantly affected by irrigation treatments and rapeseed varieties. Seed yield had not significant difference between 70 to 210 kg N ha(-1) treatments. Both Water Use Efficiency (WUE) and dry matter remobilization efficiency (DMRE) were increased by decreasing water supply in I90 to I150 treatments. But N0 and N210 resulted in the lowest WUE and DMRE, respectively. Considering all traits, the first year of experiment was better than second year. The irrigation x variety interaction had a significant (p < 0.01) effect on seed yield and WUE. Generally, I150N70V1 combination is recommended in the region of the study due to high performance in production of seed and oil yield.
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Claims 18
Claim · model-written summary
Thousand seed weight was lower in 2006 than 2005 at every irrigation and nitrogen level.
Verbatim
e0“Thousand-seed weight (TSW) in all irrigation and nitrogen levels was lower in the 2006 than that of the 2005.”
t0“Rapeseed”
Claim · model-written summary
Seed oil percentage decreased with greater water use in the second year.
Verbatim
e0“Seed oil percentage (SOP) was decreased with increasing water use only in second year.”
t0“Rapeseed”
Claim · model-written summary
Increasing nitrogen rate decreased seed oil percentage in 2006.
Verbatim
e0“As nitrogen rate increased, SOP decreased and seed oil yield (SOY) increased in the 2006 significantly (p < 0.05).”
t0“Rapeseed”
Claim · model-written summary
Increasing nitrogen rate increased seed oil yield in 2006.
Verbatim
e0“As nitrogen rate increased, SOP decreased and seed oil yield (SOY) increased in the 2006 significantly (p < 0.05).”
t0“Rapeseed”
Claim · model-written summary
Greater water supply increased seed oil yield in the first year.
Verbatim
e0“With increasing water supply, SOY increased in first year.”
t0“Rapeseed”
Claim · model-written summary
Zarfam had higher thousand seed weight in both years.
Verbatim
e0“Zarfam variety had a higher TSW and SOP in both years.”
t0“Rapeseed”
Claim · model-written summary
Zarfam had higher seed oil percentage in both years.
Verbatim
e0“Zarfam variety had a higher TSW and SOP in both years.”
t0“Rapeseed”
Claim · model-written summary
Irrigation treatments and varieties did not significantly affect seed yield.
Not reportedComparatorDirection
Verbatim
e0“According to combined analysis results, seed and oil yield were not significantly affected by irrigation treatments and rapeseed varieties.”
Claim · model-written summary
Irrigation treatments and varieties did not significantly affect oil yield.
Not reportedComparatorDirection
Verbatim
e0“According to combined analysis results, seed and oil yield were not significantly affected by irrigation treatments and rapeseed varieties.”
Claim · model-written summary
Seed yield did not differ significantly among 70 to 210 kg N ha(-1) treatments.
Verbatim
e0“Seed yield had not significant difference between 70 to 210 kg N ha(-1) treatments.”
t0“Rapeseed”
Claim · model-written summary
Reduced water supply from I90 to I150 increased water use efficiency.
Verbatim
e0“Both Water Use Efficiency (WUE) and dry matter remobilization efficiency (DMRE) were increased by decreasing water supply in I90 to I150 treatments.”
t0“Rapeseed”
Claim · model-written summary
Reduced water supply from I90 to I150 increased dry matter remobilization efficiency.
Verbatim
e0“Both Water Use Efficiency (WUE) and dry matter remobilization efficiency (DMRE) were increased by decreasing water supply in I90 to I150 treatments.”
t0“Rapeseed”
Claim · model-written summary
N0 gave the lowest water use efficiency.
Verbatim
e0“But N0 and N210 resulted in the lowest WUE and DMRE, respectively.”
t0“Rapeseed”
Claim · model-written summary
N210 gave the lowest dry matter remobilization efficiency.
Verbatim
e0“But N0 and N210 resulted in the lowest WUE and DMRE, respectively.”
t0“Rapeseed”
Claim · model-written summary
The first year performed better overall across measured traits.
Verbatim
e0“Considering all traits, the first year of experiment was better than second year.”
t0“Rapeseed”
Claim · model-written summary
Irrigation by variety interaction significantly affected seed yield.
Not reportedDirection
Verbatim
e0“The irrigation x variety interaction had a significant (p < 0.01) effect on seed yield and WUE.”
t0“Rapeseed”
Claim · model-written summary
Irrigation by variety interaction significantly affected water use efficiency.
Not reportedDirection
Verbatim
e0“The irrigation x variety interaction had a significant (p < 0.01) effect on seed yield and WUE.”
t0“Rapeseed”
Claim · model-written summary
The authors recommend I150N70V1 for regional seed and oil production.
Verbatim
e0“Generally, I150N70V1 combination is recommended in the region of the study due to high performance in production of seed and oil yield.”
t0“Rapeseed”
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