本课题在内蒙古、吉林和陕西三省区八个试验点，经三十年的试验研究，总结出一套退化草原改良技术。试验结果表明，在干旱及半干旱草原地......

Cotton (Gossypium hirsutum L.) is an economically important crop for the Southern United States. The southern US also ha......