Factors Affecting Nitrogen Use Efficiency and Grain Yield of Summer Maize on Smallholder Farms in the North China Plain

A - Papers appearing in refereed journals

Chen, G., Cao, H., Liang, J., Ma, W., Guo, L., Zhang, S., Jiang, R., Zhang, H., Goulding, K. W. T. and Zhang, F. 2018. Factors Affecting Nitrogen Use Efficiency and Grain Yield of Summer Maize on Smallholder Farms in the North China Plain. Sustainability. 10 (2), p. 363.

AuthorsChen, G., Cao, H., Liang, J., Ma, W., Guo, L., Zhang, S., Jiang, R., Zhang, H., Goulding, K. W. T. and Zhang, F.
Abstract

The summer maize yields and partial factor productivity of nitrogen (N) fertilizer (PFPN, grain yield per unit N fertilizer) on smallholder farms in China are low, and differ between farms due to complex, sub-optimal management practices. We collected data on management practices and yields from smallholder farms in three major summer maize-producing sites—Laoling, Quzhou and Xushui—in the North China Plain (NCP) for two growing seasons, during 2015–2016. Boundary line analysis and a Proc Mixed Model were used to evaluate the contribution of individual factors and their interactions. Summer maize grain yields and PFPN ranged from 6.6 t ha−1 to 14.2 t ha−1 and 15.4 kg kg−1 to 96.1 kg kg−1, respectively, and averaged 10.5 t ha−1 and 49.1 kg kg−1, respectively. The mean total yield gap and PFPN gap were 3.6 t ha−1 and 43.3 kg kg−1 in Laoling, 2.2 t ha−1 and 24.5 kg kg−1 in Xushui, and 2.8 t ha−1 and 41.1 kg kg−1 in Quzhou. A positive correlation was observed between the yield gap and PFPN gap; the PFPN gap could be reduced by 6.0 kg kg−1 (3.6–6.6 kg kg−1) by reducing the yield gap by 1 t ha−1. The high yield and high PFPN (HH) fields had a higher plant density and lower N fertilization rate than the low yield and low PFPN (LL) fields. Our results show that multiple management factors caused the yield gap, but the relative contribution of plant density is slightly higher than that of other management practices, such as N input, the sowing date, and potassium fertilizer input. The low PFPN was mainly attributed to an over-application of N fertilizer. To enhance the sustainable production of summer maize, the production gaps should be tackled through programs that guide smallholder farmers on the adoption of optimal management practices.

Year of Publication2018
JournalSustainability
Journal citation10 (2), p. 363
Digital Object Identifier (DOI)doi:10.3390/su10020363
Open accessPublished as ‘gold’ (paid) open access
FunderNational Basic Research Program of China
National Key R&D Plan of China
Publisher's version
Output statusPublished
Publication dates
Online03 Feb 2018
Publication process dates
Accepted23 Jan 2018
PublisherMDPI
MDPI
Copyright licenseCC BY
Grant ID2015CB150405
2016YFD0200401
ISSN2071-1050

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