NDLI: Fates of 15 N-urea in black soil – maize system and their response to straw incorporation in northeast China : a case study

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Fates of 15 N-urea in black soil – maize system and their response to straw incorporation in northeast China : a case study

Content Provider	Semantic Scholar
Author	Quan, Zhi Li, Shanlong Zhu, Feifei Fang, Yunting Li, Peipei Zhang, Limei Sheng, Rong Wen-Xue He, Jizheng
Copyright Year	2016
Abstract	A better understanding of the fates of fertilizer N is critical to design appropriate N management strategies in intensively cultivated croplands. In this study, we evaluated the fates of N-urea in a field experiment on a black soil-maize system and their responses to straw incorporation in Gongzhuling, Northeast China. In order to get realistic results, we adopted the field management used by local farmers. Results showed that the crop N uptake was the main sink, recovering 52-53 % of the fertilizer N. Total N recoveries in plant organs followed the order: grain (27-29%) > leaf (11-12%) > stem (6%) > tassel, silks, leaf sheath, husks, etc. (5%) > root (2%) > cob (1%). Tracer N remaining in soil was the second largest sink (25-33%), and most (18-29%) was located in the ridge 0-20 cm layer (fertilized area). The total loss of fertilizer N was 13-23%. Straw incorporation increased the retention of applied fertilizer N and decreased its losses, although there was no significant difference in plant N uptake. The contribution of fertilizer N to total N uptake was 3637% at the physiological maturity stage of maize. Fertilizer N was an important N source for maize growth but soil N was still the main N source. Our results indicate that Nitrogen Use Efficiency (NUE) in maize cultivation system in northeast China is not as low as that reported by many previous studies using difference or balance method. Considering the low NUE in China, our next aim is to find out which region, and which kinds of crops lowered the overall NUE in Northeast China.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.ini2016.com/pdf-papers/INI2016_Quan_Zhi.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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