Abstract:

Studying on corn quantitative characters such as corn yield, corn yield of single plant, area of ear leaf, and corn straw yield and so on for finding out the effect of different phosphorus fertilizer rates with balanced fertilization of nitrogen, potash, magnesium and zinc on red soil of upland. A field experiment on phosphorus rates was conducted in Yunnan Plateau. Results showed that there was more sensitivity between different phosphorus fertilizer rates and corn yield, corn yield of single plant, area of ear leaf, seed weight of ear and corn straw yield, and its variation range was more than 46%; but it was less sensitivity to the chlorophyll content and plant height, the variation range was less than 20%. Rank of corn biological yield of different treatments from high to low was 2OPT+P > 2OPT > 2OPT-P > OPT > 2OPT-2P > CK.