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Abstract The effects of N, P and K fertilizer application on the growth and nutrient absorption of Pennisetum hydridum were discussed when using dredged soil as the planting substrate, and the most suitable fertilizer ratio was screened out, the fertilizer demand law of Pennisetum hydridum was revealed, and the theoretical basis was provided for the efficient cultivation of Pennisetum hydridum on dredged soil, scientific and reasonable disposal and reclamation of Dredging soil.The dredged soil was used as the test soil and Pennisetum hydridum was used as the planting material to carry out the potting test. Three factors of N, P and K were set up at three levels for each factor. Growth indicators such as plant height, leaf number, dry weight and nutrient absorption of the whole plant were measured under different fertilization treatments. The results showed that formula fertilization could significantly increase the plant height, biomass and N, P and K nutrient uptake(P<0.05). The plant height, leaf number, total biomass, N, P and K uptake of the whole plant increased by 59.87%, 68.39%, 378.46%, 455.54%, 433.79% and 454.37% respectively compared with CK under S4 treatment(1.41 g N, 0.83 g P2O5 and 0.5 g K2O per plant). The comprehensive evaluation results of different fertilization treatment effects showed that S4(N2P1K2) was the most ideal fertilization formula, which could significantly promote the growth and nutrient absorption of Pennisetum hydridum, and promote the growth of Pennisetum hydridum in the dredged soil. Reasonable combined application of N, P and K can increase the biomass and nutrient absorption of Pennisetum hydridum, and promote the growth of Pennisetum hydridum in dredged soil.
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2024, Vol. 37 
