haplaquod

For the sake of obtained high-yield and excellent quality of cotton,we had en-gaged in fertilizing experiments on N,P,K,B,Zn calcareous alluvial soil in the eastern regionof Hubei during 1987～1991 and had gotten mathematical models between yield of cottonand N or K.

连续５年在鄂东灰潮土上进行了旨在获得棉花高产优质的氮、磷、钾、硼、锌合理施用技术的试验，建立了单因子的施肥数学模型，总结出了因土质、因品种、因气候、因管理而定性、定量、定时、定法的“四因、四定”的棉花高产施肥技术。