Nitrogen fertilization on palisadegrass: phytomass decomposition and nutrients release

Author(s)

Claudio Hideo Martins da Costa ^[1] ; Carlos Alexandre Costa Crusciol ^[2] ; Rogério Peres Soratto ^[3] ; Jayme Ferrari Neto ^[4] ; Edemar Moro ^[5]

Affiliation

^[1] Universidade Federal de Goiás. Unidade Acadêmica Especial de Ciências Agrárias - Brasil

^[2] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas. Departamento de Produção e Melhoramento Vegetal - Brasil

^[3] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas. Departamento de Produção e Melhoramento Vegetal - Brasil

^[4] Universidade Estadual Paulista. Faculdade de Ciências Agronômicas. Departamento de Produção e Melhoramento Vegetal - Brasil

^[5] Universidade do Oeste Paulista - Brasil

• Document type: Journal article
• Source: Pesqui. Agropecu. Trop.; v. 46, n. 2, p. 159-168, 2016-06-00.

Abstract

ABSTRACT Topdressing or pre-seeding nitrogen (N) application increases phytomass production, providing a higher nutrients accumulation and indirectly favoring the subsequent crop. However, N fertilization can alter the dry matter decomposition and nutrients release dynamics. This study aimed at evaluating the decomposition rate, cellulose, lignin and nutrients release speed from palisadegrass as a function of N fertilization. The experimental design was randomized blocks with four replications, in a factorial scheme constituted by two N fertilization levels and six sampling times after desiccation [0, 14, 34, 41, 51 and 68 days after management (DAM)]. The topdressing N fertilization on palisadegrass increases the dry matter production and N accumulation, but does not alter the decomposition and release speed. N fertilization reduces the C/N ratio, but it does not change the contents of cellulose and lignin and the decomposition and release of N, K, Ca, Mg, C and Si. The amounts of P and S accumulated in the plant and released into the soil increase with N fertilization. The maximum release rates occur within 0-14 DAM, being more intensive for P and S when N is applied. These results demonstrate the high potential of this species for crop-livestock integration systems, with some advantages that can be potentialized with higher N doses. (AU)