[1] Northwest A&F Univ, Coll Agron, Yangling 712100, Shaanxi, Peoples R China
[2] China Agr Univ, Coll Agron & Biotechnol, Key Lab Farming Syst, Minist Agr & Rural Affairs, Beijing 100193, Peoples R China
[3] Haining Crop Technol Serv Stn, Haining 314400, Zhejiang, Peoples R China
[4] Ningxiang Agr Technol Extens Ctr, Changsha 410600, Hunan, Peoples R China
[5] Hunan Soil & Fertilizer Inst, Changsha 410125, Hunan, Peoples R China