Most of the soil in southwest of our country is red soil, the leanness and the phosphorite deficiency act as the key non-biotic stress to confine the maize yield improvement.

• 在我国西南玉米生态区多数红壤，土壤贫瘠，有效磷严重缺乏，更是限制玉米产量的重要非生物胁迫因素。