Genetic Differences Of N,P,K Absorption And Utilization Efficiency In Waxy Corn

Many researches have shown that the absorption, translocation and utilization of nitrogen (N), phosphorus (P) and potassium (K) varied markedly in different genotypes of corn. However, there are few reports on waxy corn in this field. In this study, 31 cultivars of waxy corn (Zea mays L. ceratina Kulesh) released recently within China were employed to evaluate their genotype differences in the absorption, translocation and utilization of N, P and K through the field experiment in 2003-2004. The experiments analyzed the dynamic of N, P and K in absorption, translocation and utilization in waxy corns, discussed the relationship of absorption and utilization in N, P and K with yield and screened the varieties with high yield and high NUE (Nitrogen utilization efficiency), high PUE (phosphorus utilization efficiency) or high KUE (potassium utilization efficiency). The main results were as follows:1. Genotype differences on uptake and utilization efficiency of N, P and K in waxy corn 31 waxy corn (Zea mays L. ceratina Kulesh) varieties released in recent years in China were planted to analyze their genotype differences of NUE in the same nitrogen fertilization condition(225 kg N/ha). Results showed that there were significant genotype differences in absorption and utilization of N, P and K among the 31 waxy corn cultivars. The NUE variation of fresh ear, fresh kernel and maturity kernel among varieties were 57.82 kg kg^-1～98.65 kg kg^-1, 39.43 kg kg^-1～61.31 kg kg^-1 and 31.70 kg kg^-1～53.70 kg kg^-1, respectively. The PUE variation of fresh ear, fresh kernel and...