Effects of nitrogen application on dry matter yield and nitrogen fertilizer use efficiency in sweet sorghum (Sorghum bicolor)

doi:10.11686/cyxb2019287

Abstract

Abstract: This research studied the effects of nitrogen fertilizer application on the growth and nitrogen fertilizer use efficiency of sweet sorghum (Sorghum bicolor), in order to define the appropriate nitrogen application rate in the lower Yangtze River region. A field experiment was conducted with four nitrogen application rates (0, 100, 200 and 300 kg·ha^-1; designated N₀, N₁, N₂ and N₃, respectively) and data on plant biomass, nitrogen uptake and allocation pattern and the nitrogen fertilizer use efficiency, were collected. It was found that: 1) The biomass and growth rate of sweet sorghum were increased with increase in nitrogen application rate, but no significant difference in biomass was observed between N₂ and N₃ treatments (P>0.05). The minimum nitrogen fertilizer required for harvesting the maximum biomass at the jointing stage in sweet sorghum was found by linear and platform analysis to be 244.50 kg·ha^-1; 2) As plant development progressed, the proportion of nitrogen allocated to leaves decreased while stem allocation increased. The nitrogen concentration, accumulated total N, and the proportion of nitrogen allocated to stems all increased significantly with increasing in nitrogen supply; 3) Both the nitrogen dry matter production efficiency and nitrogen recovery efficiency decreased with increasing nitrogen supply, though no significant differences were observed for nitrogen agronomic efficiency among different treatments, and the highest nitrogen recovery efficiency was found to be in the N₂ treatment. In conclusion, nitrogen fertilizer plays an important role in regulating the growth of sweet sorghum, and the recommended amount of nitrogen fertilizer for sweet sorghum planting in the lower Yangtze River region is estimated from this research to be 244.50 kg N·ha^-1. Excessive application of nitrogen fertilizer led to a decreased nitrogen fertilizer use efficiency instead of a further increase in sweet sorghum biomass.

Key words: sweet sorghum, nitrogen application, nitrogen fertilizer use efficiency, nitrogen content

GAO Li-min, TIAN Qian, SU Jing, SHEN Yi-xin. Effects of nitrogen application on dry matter yield and nitrogen fertilizer use efficiency in sweet sorghum (Sorghum bicolor)[J]. Acta Prataculturae Sinica, 2020, 29(4): 192-198.

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