Desempenho de variedades forrageiras da espécie Panicum maximum Jacq. sob diferentes doses de adubação fosfatada em solo amazônico

Abstract

The knowledge of the Phosphorus levels in the soil fertility is important to improve the return and the quality in the fodder plantation. Thus, the main aim of this paper was to evaluate the growth of three cultivars Panicum maximum genus in different phosphatized dosages of fertilization. The experiment was carried out at the Mangabeiras Experimental Farm belonged to IEAA/UFAM, located in the Humaitá city, Amazonas. The entire experimental area had 128m2 and was divided in 3 stands with 32 m2 each one. The stands have been subdivided in four plots with 2 x 4m2 totalizing 12 plots. Afterward, different dosages of phosphatized fertilization (0, 50, 100 e 150 kg P2O5 há-1) was applied. The seeds were distributed, in the twelve plots, in thirteen straight lines distant 25 cm to each other and, later sown into 1 cm deep. The measures were tabulated and processed by using the R software and the platform RStudio. The growth and the development of the 3 cultivars have presented difference when compared the different dosages of fertilization. The cvs MG-12 Paredão, Mombasa and Atlas have shown average height of 64,69 cm, 61,06 cm, 59,47 cm, respectively. The 3 have presented significant difference and the better response to the P2O5 dosages was observed to the cv MG-12 Paredão. The cv Atlas tiller, had better response to the dosages, with average of 102 kg ha⁻¹.