Responses of Pennisetum giganteum Growth and Yield to Different Planting Density and Gradients of Urea in Opencast Coal Mine Dump
In order to clarify the effects of different planting densities and urea application levels on the growth and yield formation of Pennisetum giganteum,and to provide a scientific basis for the promotion and planting of Pennisetum giganteum in the mining area,Pennisetum giganteum was planted in the reclaimed land of Manlailiang Coal Mine in Ordos City as the experimental material,and the effects of different planting densities(60 cm×80 cm,60 cm×120 cm,80 cm×100 cm,100 cm×120 cm)and different urea appli-cation rates,namely,F1(375 kg/hm2),F2(450 kg/hm2),F3(525 kg/hm2),F4(600 kg/hm2),F5(675 kg/hm2),and F6(750 kg/hm2)on the indexes of Pennisetum giganteum were studied.The results showed that,when the planting density was 100 cm×120 cm,the single plant growth of Pennisetum giganteum at tillering stage and jointing stage was better,and the plant height at the end of tillering stage and jointing stage was 63.0 cm and 244.8 cm,respectively.When the density was 60 cm×120 cm,the yield of Pennisetum gi-ganteum was the highest with the value of 33.17 t/hm2.The fertilizer application of 600 kg/hm2 resulted in the best growth and yield,and the average plant height and yield at the end of the growing season were 188.5 cm and 35.56 t/hm2,respectively.In summary,under the conditions of this experiment,the optimum planting density for high yield of Pennisetum giganteum was 60 cm×120 cm,and the optimum fertilization rate was 600 kg/hm2.
万方数据
维普
