Abstract:

To provide a theoretical basis for scientific application of fertilizer and yield improvement, four adlay lines were used as materials in the field experiment in 2018—2019. The absorption, distribution and utilization of nitrogen (N), phosphorus (P) and potassium (K) were analyzed at different growth stages. The results showed that the total biomass dry weights of the four adlay lines ranged from 20.5 t/hm² to 24.7 t/hm². The biomass dry weights of the above-ground parts were 18.4-22.6 t/hm², but the grain outputs were relatively low, which was 1969.2-3109.1 kg/hm². N, P, K absorption and accumulation increased during heading to maturing period; nitrogen element was accumulated mainly in leaf and stem tissues in heading and flowering period, while grains had more N accumulation than other plant parts, and P, K were mainly accumulated in stems. The total absorption amounts of N, P, K were 183.93 kg/hm², 62.57 kg/hm²and 320.56 kg/hm² in average, respectively, with a ratio of N: P: K=2.94: 1: 5.12. In addition, the N, P, K use efficiency for grain output and harvest indices were relatively low, and the N, P, K requirement per 100 kg grain was 5.6-7.3 kg, 1.7-2.4 kg and 8.0-15.0 kg, respectively. It is concluded that the biomass is large in the four adlay lines with robust dry matter accumulation, but the N, P, K using and distribution efficiency for grain output are relatively low, indicating that there is still potential for improving the adlay yield.

Key words: N P K elements, absorption and utilization, yield, adlay