机译:华北平原小农户可持续夏季玉米生产的农艺诊断方法
[1]College of Resources and Environmental Sciences China Agricultural University Beijing 100193 P.R.China;
[3]Key Laboratory of Plant-Soil Interactions Ministry of Education Beijing 100193 P.R.China;
[4]National Agricultural Technology Extension and Service Center Ministry of Agriculture and Rural Affairs Beijing 100125 P.R.C hina;
[2]College of Resources and Environment Science Hebei Agricultural University Baoding 071001 P.R.China;
smallholder farmers; sustainable production; yield gap; agronomic diagnosis; North China Plain;