Nitrogen nutrition of marandu grass grown under nitrogen rates an related to growth ages

Authors

  • João de Deus Gomes Santos Junior Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Solos e Nutrição de Plantas, Piracicaba, SP
  • Francisco Antonio Monteiro Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Solos e Nutrição de Plantas, Piracicaba, SP

Keywords:

Brachiaria brizantha, nitrogen fertilization, SPAD

Abstract

The objective of this research was to examine the forage yield, critical and total nitrogen concentration, related to SPAD values in the most recently expanded leave blade of Marandu grass (Brachiaria brizantha cv. Marandu) under nitrogen rates of 28, 112, 210, 294 and 378 mg L-1 and growth ages of 21, 28, 35, 42, 49 and 56 days after seedling emergence. The experiment was carried out in a greenhouse, with nutrient solution using ground quartz as substrate. The experimental design was a complete randomized block design, with treatments arranged in a factorial, with four replications. Nitrogen rates and growth ages interaction was significant for all studied attributes of Marandu grass. Maximum dry matter yield was estimated to occur at nitrogen rates between 257 and 304 mg L-1, depending on plant age. The critical nitrogen concentration determined in the most recently expanded leaf blade was significantly influenced by plant ages and ranged from 33.8 to 12.8 g kg-1. SPAD values at the critical nitrogen concentration ranged from 45 to 50 when growth periods ranged from 21 to 49 days.

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Published

2013-11-29

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Nitrogen nutrition of marandu grass grown under nitrogen rates an related to growth ages. (2013). Bulletin of Animal Husbandry, 60(2), 139-146. http://bia.iz.sp.gov.br/index.php/bia/article/view/1342

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