Global Maize Project in China: Liufangzi, Gongzhuling, Jilin Province

Project was initiated in 2009 to test how the performance of ecological intensification (EI) compares to that of current farmer practice (FP)


29 Apr 2016

2015 Annual Interpretive Summary

This long-term Global Maize field trial was established in 2009 at Liufangzi, Gongzhuling city, Jilin Province. This year was the 7th season of monocropped spring maize. Multiple effects of ecological intensification (EI) were investigated to compare yield and N use efficiency against farmers’ practices (FP). In 2015, spring maize was planted on May 1 and harvested on September 30.

The experiment was designed to compare an EI application of 200-75-90 kg N-P2O-K2O/ha against FP of applying 251-145-100 kg/ha. The study also had three subplots that created three different N application regimes: (1) N applied in all three years, (2) N applied in two of every three years, and (3) no N applied in any year.

Results found that EI, with N applied in all years, produced 11 t/ha, which was significantly higher that produced under FP (9.6 t/ha). Additionally, much less fertilizer N was applied in EI versus FP. Agronomic efficiency (kg grain yield increase per kg N applied, AE) within EI was 44.2 kg/kg, which was significantly higher than AE under FP (28.0 kg/kg). Likewise, partial factor productivity of N (kg grain yield per kg N applied, PFP) was higher (55.0 kg/kg) in EI than in FP (38.3 kg/kg). This was mainly due to the lower fertilizer N application in EI compared to FP.