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Palisadegrass effects on N fertilizer dynamic in intercropping systems with corn

2017; Brazilian Academy of Sciences; Volume: 89; Issue: 3 Linguagem: Inglês

10.1590/0001-3765201720160811

1678-2690

Rodrigo Estevam Munhoz de Almeida, Silas Maciel de Oliveira, Bruno Cocco Lago, P. CLOVIS, Paulo César Ocheuze Trivelin, José Laércio Favarin,

Plant nutrient uptake and metabolism

Corn grain yield, nitrogen (N) fertilizer efficiency and distribution to corn alone and three forms of corn and palisadegrass (Urochloa spp.) intercropping implantation was investigated. A field experiment with 15N labeling fertilizer was performed in randomized block design. No form of palisadegrass intercropping implantation affected corn grain yield, total N accumulation and N use efficiency (NUE), which were 8.7 t ha-1, 205 kg ha-1 and 37% respectively. The palisadegrass produced on average 1.9 t of dry mass, absorbing a maximum of 6 kg ha-1 or 5.5% of N fertilizer during corn growing. Furthermore, the palisadegrass did not affect N fertilizer distribution in soil-plant system, in which 28.2% was recovered in the soil and 40.4% in the plants (corn + palisadegrass). The results show that for the three intercropping implantation methods the palisadegrass did not compete with corn for N fertilizer.