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| Effects of N fertilizer on seed yield，quality and fertilizer-Nuse efficiency of three rape cultivars with normaland high oil contents |
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| DOI：10.16768/j.issn.1004-874X.2016.06.019 |
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| Abstract: |
| In this study，seed yield，quality and fertilizer-N use efficiency in rape（ Brassica napus L.） were
researched in normal oil content cultivar（ Yangyou 6） and two high oil content cultivars（ Zhongshuang 11 and Zheyou
50）. Results showed that the average oil contents of all treatments in Yangyou 6，Zhongshuang 11 and Zheyou
50 were 42.87%，47.37% and 48.28%，respectively. The average protein contents of all treatments in Yangyou 6，
Zhongshuang 11 and Zheyou 50 were 24.15%，22.71% and 21.84%，respectively. The increased ratio of total nitrogen accumulation amount in Yangyou 6 was higher than
that in Zhongshuang 11 and Zheyou 50. Among level
three cultivars，the total protein accumulation amount in
Yangyou 6 was highest，and the total oil accumulation
amount was highest in Zheyou 50. With nitrogen
fertilization level increasing，different parameters of
fertilizer-N use efficiency decreased. The average
apparent N-use（ ANU） in Yangyou 6 was 68.70%，
which was higher than that in Zhongshuang 11 and Zheyou 50（ 65.06% and 60.30%，respectively）. The average agronomic N-efficiency（ ANE） in Yangyou 6 was
also the highest among the three cultivars，which was 8.97 ㎏ seed / ㎏ N. On the contrary，the average values of
physiologic N-efficiency（ PNE） in Zhongshuang 11 and Zheyou 50 were13.03 ㎏ seed/ ㎏ N and 13.84 ㎏ seed/ ㎏ N，
respectively，which were higher than that in Yangyou 6（ 12.91 ㎏ seed/㎏ N）. Differences of partial factor productivity
of applied N（ PFP） were slight in three cultivars. |
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