Effects of plant density and nitrogen level on nitrogen uptake and utilization of winter wheat

A two-year (2011-2012 and 2012-2013) field experiment was conducted on one winter wheat cultivar supplied with two levels, of nitrogen (180 and 240 kg N · hm(-2)) under three plant densities (135 x 10(4), 270 x 10(4), and 405 x 10(4) plants · hm(-2)) . The 15N-labeled urea was injected into 20, 60 a...

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Published inYing yong sheng tai xue bao Vol. 26; no. 6; p. 1727
Main Authors Zhang, Juan, Wu, Tong-hua, Dai, Xing-long, Wang, Xi-zhi, Li, Hong-mei, Jiang, Ming-yang, He, Ming-rong
Format Journal Article
LanguageChinese
Published China 01.06.2015
Subjects
Fertilizers
Nitrates - metabolism
Nitrogen - metabolism
Soil - chemistry
Triticum - physiology
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Summary:A two-year (2011-2012 and 2012-2013) field experiment was conducted on one winter wheat cultivar supplied with two levels, of nitrogen (180 and 240 kg N · hm(-2)) under three plant densities (135 x 10(4), 270 x 10(4), and 405 x 10(4) plants · hm(-2)) . The 15N-labeled urea was injected into 20, 60 and 100 cm soil depths, respectively, aiming to investigate the effect of nitrogen and plant density and their interaction on the N uptake, utilization and nitrate nitrogen contents at different soil depths. The results showed that increasing the plant density from 135 x 10(4) to 405 x 10(4) plants · hm(-2) significantly increased the 15N uptake at depths of 20, 60 and 100 cm averagely by 1.86, 2.28 and 2.51 kg · hm(-2), respectively, and increased the above ground N uptake (AGN) , N uptake efficiency (UPE) averagely by 12.6% and 12.6%, respectively, but decreased the N utilization efficiency (UTE) by 5.4%. Compared to the N input of 240 kg N · hm(-2) the 180 kg N · hm(-2) significantly reduced the 15N uptake at dep
ISSN:1001-9332