Structural characteristics and nutritional value of Tifton 85 grass under nitrogen doses at different ages of regrowth in the semiarid

The objective of this study was to evaluate the structural, productive and nutritional value of Tifton 85 grass fertilized with two nitrogen doses at four regrowth ages. The experimental design was a randomized block in a factorial 4 x 2, with four regrowth ages (28, 35, 42 and 49 days) and two levels of nitrogen (100 and 300 kg ha-1) in six replicates, totaling 48 experimental units, of 25 m2 (5x5m) each. The blocking criterion was the variation in the experimental area. Dry matter production increased linearly, on average 56.4%, as the regrowth age increased from 28 to 49 days (P<0.01). Among the N rates, there was a 17.2% increase in dry matter yield when fertilized with 300 kg / ha of nitrogen. The height of the plants (P <0.01), as well as the number of live leaves (P <0.01), number of expanded leaves (P <0.01) and the final leaf length (P <0.01) increased linearly with the advancement of cut age. Fertilization of Tifton 85 grass with 100 kg ha-1 of N, managed every 35 days improves the dry matter production, structural characteristics and nutritional value of forage for cutting and / or grazing.

[1]  Benjamin Sa,et al.  Effect of Seed Variety and Cutting Age on Dry Matter Yield, NutritiveValues and In Vitro Digestibility of Teff Grass , 2017 .

[2]  V. Mesquita,et al.  Forage accumulation, tillering and bromatological characteristics of Brachiaria grass under nitrogen fertilization , 2017 .

[3]  W. Jokela,et al.  Net effects of nitrogen fertilization on the nutritive value and digestibility of oat forages. , 2017, Journal of dairy science.

[4]  R. Keshavarz-Afshar,et al.  Nitrogen Fertilizer and Seeding Rate Influence on Grain and Forage Yield of Dual-Purpose Barley , 2016 .

[5]  F. P. Monção,et al.  Nutritional Parameters of Leaf Blade from Different Tropical Forages , 2016 .

[6]  R. Reis,et al.  Combining Marandu grass grazing height and supplementation level to optimize growth and productivity of yearling bulls , 2015 .

[7]  P. Huhtanen,et al.  An evaluation of the performance and efficiency of nitrogen utilization in cattle fed tropical grass pastures with supplementation , 2014 .

[8]  Reginaldo Ferreira Santos,et al.  Effect of nitrogen fertilization and cutting age on yield of tropical forage plants , 2013 .

[9]  A. C. Cóser,et al.  Lâminas de irrigação e doses de nitrogênio em pastagem de capim-elefante no período chuvoso no norte de Minas Gerais , 2011 .

[10]  G. Lemaire,et al.  N uptake and distribution in crops: an agronomical and ecophysiological perspective. , 2002, Journal of experimental botany.

[11]  P. V. Soest,et al.  A net carbohydrate and protein system for evaluating cattle diets: I. Ruminal fermentation. , 1992, Journal of animal science.

[12]  M. Neumann,et al.  Chemical fractionation of carbohydrate and protein composition of corn silages fertilized with increasing doses of nitrogen , 2017 .

[13]  L. Sartor,et al.  Productivity and nutritional value of African Star managed with different leaf blade mass , 2016 .

[14]  J. Wilson Organization of Forage Plant Tissues , 1993 .

[15]  H. Goering,et al.  Forage fiber analyses (apparatus, reagents, prcedures, and some applications) , 1970 .

[16]  Wilhelm Koeppen,et al.  Climatología : con un estudio de los climas de la tierra , 1948 .