Resposta da forrageira Tifton a doses de fertilizantes com e sem uso da calagem

Abstract

Bermuda grass or Tifton grass is a hybrid of the genus Cynodon that has high productivity, nutritional value, and digestibility, being used for grazing and haymaking. For the production of dry matter in quantity and quality, the crop is demanding in nutrition and correction of soil acidity. However, Brazilian soils are of low natural fertility and, in forage crops, it is common to neglect acidity correction and replacement of extracted nutrients. These management practices have resulted in low performance of cultivated forages. The objective of this work was to evaluate the dry matter production of Tifton submitted to fertilization doses and the use or not of liming. The experimental design was randomized blocks in a 5 x 2 scheme, with five doses of fertilizers, corresponding to 0, 50, 100, 150 and 200% of the recommended dose for the crop based on soil analysis, with and without the use of liming and five repetitions. The response variable was the sum of the dry matter of the aerial part of the crop (MS) after four cuts, corresponding to the first year of development of the crop, after its implantation. The results were subjected to analysis of variance, and when significant (p = 0.05), the data were compared using a regression study. The general averages with and without the use of liming did not differ for the Tifton DM yield. There was a response to the doses of fertilizers, with a dose of 100% and above those that promoted greater accumulations of DM. The liming x doses iteration was significant where the 150% dose promoted an increase of 33.10% in DM compared to the same dose without liming.