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.
Highlights
Maize is an important food crop for both humans and animals throughout the world, with a planting area of almost 186 million hectares in 174 countries [1]
12.7 tt hhaa−−1)1 winasXsuigsnhiufiic,aanntldy ltowhae−r 1thtaon1t4h.a2t tinhXa−us1hiuni Q(10u.z5htohua−(1)FiagnudreQu3z).hoTuhe(11m.4eat nhay−1i)e. ld in LaoliTnhge(Y9.a3tt itnhQau−z1h) owua(s14s.i0gtnhifia−c1a) nwtalys h(pig≤he0r .t0h1a)nlothwateirnthLaaonlitnhga(t1i2n.5Xtuhsah−1u) ian(1d0X.5utshhuai−(11)2.a6ntdhaQ−1u).zhou (11.4 Tthheat−ot1a)l. yTiehlde gYaapttrianngQeduzfrhoomu0(1t 4h.a0−1ttoha6−.31t) hwa−a1sinhLigaholeinr gt,hfaronmth0att hina−1Ltaoo4l.i8ntgh(a1−12.i5n Xt uhsah−u1i,) and XushuSuis(ta1in2a.b6ilittyh2a01−81, 1)0. ,Tx hFOeRtoPEtaERl yRiEeVlIdEWgap ranged from 0 t ha−1 to 6.3 t ha−1 in Laoling, from6 o0f 1t8ha−1 to 4.8 t ha−Su1staiinnabXiliutys2h01u8,i1,0,axnFOdRfPrEoEmR RE0VItEWha−1 to 6.4 t ha−1 in Quzhou
We found that the amount of N applied was the most important limiting management factor for the PFPN gap in 57.4% to 65.8% of all fields (Figure 6b)
Summary
Maize is an important food crop for both humans and animals throughout the world, with a planting area of almost 186 million hectares in 174 countries [1]. Closing the maize yield gap, especially on smallholder farms, is necessary in order to ensure global food security [6,7,8,9]. China is the second largest maize producer in the world, and contributes 20.8% of the global maize output [1]. The North China Plain (NCP) is an important maize production area in China, producing one-third of all of its maize (Ministry of Agriculture of People’s Republic of China, 2009). It is important to improve the crop yield and close the existing yield gap between the attainable yield and farmers’ actual yield
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