title: [Study on economic NPK(nitrogen-phosphorus-potassium)-requirements for medicinal safflower].
abstract: A design of second order orthogonal rotative regression was developed and field tested, and a model for obtaining 18kg/mu dry flower yield was simulated and built according to several better combinations based on the model of total safflower dry flower yield. The optimal NPK-requirements for obtaining the above 18kg/mu dry flower yield are N:6-6.5kg/mu, P2O5:10.0-11.0kg/mu, K2O:6.9-10.0kg/mu. These requirements may be adjusted rationally according to soil fertility, manure sources, and so on.
authors.affiliation: Sichuan Institute of Chinese Materia Medica, Chongqing.
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D005308:Fertilizers; D008433:Mathematics; D009584:Nitrogen; D010758:Phosphorus; D010946:Plants, Medicinal / Q000254:growth & development*; D011188:Potassium
chemical_list: D005308:Fertilizers; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium