Tag Archives: regrowth

xxx J.F. Muricy, F.F. Silva, G.C. Dutra, T.M. Neto, I.C. Dutra, C.J. Santos, R.R. Silva, R.S. Hermógenes, F.F. Cerqueira, A.J.V. Pires, N.V. Silva and B.E.F. Santos
Liquid fertilization and conventional fertilization on soil fertility and agronomic and morphophysiological characteristics of Brachiaria brizantha cv. Braúna grass
Abstract |
Full text PDF (321 KB)

Liquid fertilization and conventional fertilization on soil fertility and agronomic and morphophysiological characteristics of Brachiaria brizantha cv. Braúna grass

J.F. Muricy, F.F. Silva, G.C. Dutra, T.M. Neto, I.C. Dutra*, C.J. Santos, R.R. Silva, R.S. Hermógenes, F.F. Cerqueira, A.J.V. Pires, N.V. Silva and B.E.F. Santos

State University of Southwest of Bahia, BR45700-000, Itapetinga, Bahia, Brazil
*Correspondence: ingriidyduutra@gmail.com

Abstract:

The objective of this study was to evaluate the effect of liquid and conventional fertilization on soil fertility, assessed by regrowth, and on the morphophysiological characteristics of Brachiaria brizantha cv. Braúna. The experiment was conducted in a greenhouse at the State University of Southwest Bahia, in Itapetinga-BA, from December 2018 to April 2019. The experimental design adopted was completely randomized, with four replicates, totaling 24 experimental units, in a 2×3 factorial scheme, comprising two types of fertilization (liquid and conventional) and three regrowths, with cutting intervals of 21 days. The results revealed that conventional fertilization promoted an increase in the levels of calcium (Ca) and phosphorus (P) in the soil, which, in turn, positively impacted the sum of bases and base saturation, reaching values of 5.6 cmolc dm-3 and 54%, respectively, in the first regrowth. The dry mass production of the aerial part was influenced by both regrowth and the type of fertilization. A 27% reduction in dry mass production was observed from the first to the second regrowth, and a 16% reduction from the second to the third. On the other hand, conventional fertilization provided a 20% increase in dry mass production. The morphological variables of the plant were influenced by regrowth, with the exception of the leaf appearance rate (LAR), which did not present significant variations. A reduction in the other morphological variables was observed with each regrowth. Fertilization, in turn, influenced only the length of the flagellum leaf (LFL) and the total length of the tiller (TTL). The interaction between regrowth and fertilization was significant for leaf area, specific leaf area, leaf area index and leaf area ratio. The SPAD index, chlorophyll b and total chlorophyll contents were influenced by regrowth, with a progressive increase with each regrowth. Conventional fertilization promoted an increase in the SPAD index, with a value of 35.53, compared to 33.51 for liquid fertilization. The interaction between regrowth and fertilization was significant for the chlorophyll a:b ratio and carotenoids. The chlorophyll a:b ratio decreased with each regrowth. Conventional fertilization resulted in a 1.04% increase in crude protein content compared to liquid fertilization. Dry matter (DM), neutral detergent fiber (NDF), acid detergent fiber (ADF) and ash contents were influenced by regrowth, with a progressive increase with each regrowth, except for ash, which showed a reduction. Regrowth demonstrated greater influence on the productive and morphophysiological characteristics of braúna grass. Conventional fertilization is recommended to promote improvements in soil fertility and increase the crude protein content of signal grass Brachiaria brizantha cv. Braúna.

Key words:

, , ,



1581-1596 A.A. Seixas, D.D. Fries, D.L.S. Dias, I. A.P.S. Santos, N.T. Cruz, F.A. Teixeira, P. Bonomo and F.P. Amaral Júnior
Carbohydrate and protein metabolism of marandu grass affected by nitrogen fertilisation and number of cuts
Abstract |
Full text PDF (702 KB)

Carbohydrate and protein metabolism of marandu grass affected by nitrogen fertilisation and number of cuts

A.A. Seixas¹*, D.D. Fries², D.L.S. Dias³, I. A.P.S. Santos¹, N.T. Cruz¹, F.A. Teixeira², P. Bonomo² and F.P. Amaral Júnior⁴

¹State University of Southwest Bahia, Post-graduate programme in Animal Science, Spring Square, 40, Spring, 45700000, Itapetinga, Bahia, Brazil
²State University of Southwest Bahia, Department of Exact and Natural Science,
Spring Square, 40, Spring, 45700000, Itapetinga, Bahia, Brazil
³State University of Feira of Santana, Department of Biological Sciences, New Horizon, 44036900, Feira of Santana, Bahia, Brazil
⁴4State University Paulista Júlio of Mesquita Filho, Faculty of Agricultural and Veterinary Scienses of Jaboticabal, Vila Industrial, 14884900, Jaboticabal, São Paulo, Brazil
*Correspondence: angelseixas11@hotmail.com

Abstract:

Understanding the metabolism of tropical grasses in response to management practises imposed in pastoral environments allows for improvements in the management and use of mineral fertilisers. This study aimed to quantify metabolite content in different plant parts of Marandu grass (Urochloa brizantha), with a specific focus on the influence of nitrogen fertilisation and its effects following successive cuts. The treatments corresponded to four nitrogen (N) rates (0, 75, 150, and 225 kg N ha-1) and the number of cuts (one, two and three cuts). The plants were fractionated into leaves, stems, and roots to assess the content of water-soluble carbohydrates (WSC), starch, albumin, globulin, prolamin, and glutelin content. N fertilisation influenced the WSC and starch content in different parts of the plant, varying according to the cuts made. In the leaves and roots, fertilisation reduced the content of WSC and starch with one cut, as these were utilised as energy sources for assimilating the excess nitrogen in the soil. There was an increase in the concentration of all protein groups with nitrogen fertilisation in all parts of the plant with one cut. In plants cut two and three times, N fertilisation led to specific increases and decreases in different parts of the plants as an adaptive strategy for allocating resources as the number of cuts increased. Our results broaden our understanding of carbohydrate and protein metabolism in tropical grasses, thereby providing subsidies for the rational use of nitrogen fertilisers.

Key words:

, , , ,