Abstract:

In order to screen sugarcane germplasms of high nutrient efficiencies and breed sugarcane varieties for high nutrient efficiencies, the experiment was conducted to investigate the variations of shoot dry weight, plant absorption efficiency and utilization efficiency of N, P, K in 40 Saccharum relative genus by hierarchical cluster method. The results showed that the plant shoot dry weight of Saccharum relative genus ranged from 1.26 to 39.6 kg per hill, the coefficient of variation was 75.92%. The shoot dry weight of Yunnan 82-85 was only 40.78% of napier grass 82-21, but plant utilization efficiency of N, P, K was 4.9, 1.7 and 3.2 fold of Yunnan 82-85 compared with those of enapier grass 82-21, respectively. The ranges of shoot DW, plant absorption efficiency and utilization efficiency of N, P, K in Saccharum relative genus were so large that they could be classified into some clusters. The differences among clusters were significant, and plant nutrition efficiency among N, P, K were also significant differences in the same clusters. The above results provide useful information for breeding novel sugarcane germplasms for high nutrient efficiencies and elucidating the mechanism of high nutrient efficiency in sugarcane.