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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Periods of weed interference in chickpea grown under different doses of nitrogen fertilizer topdressing

Texto completo
Autor(es):
Amaral, Carita Liberato [1] ; Pavan, Guilherme Bacarin [1] ; Mastrotti Pereira, Fernanda Campos [1] ; da Costa Aguiar Alves, Pedro Luis [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Zona Rural, Rod Acesso Prof Paulo Donato Castellane, Km 05, BR-14884900 Sao Paulo - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Acta Scientiarum. Agronomy; v. 40, 2018.
Citações Web of Science: 0
Resumo

Weed interference can reduce chickpea growth and, therefore, productivity depending on the period of coexistence and the nutritional status of the crop, among other factors. A study was performed over two crop years to estimate the critical period of weed interference (CPWI) during chickpea production under three doses of nitrogen (N) fertilizer topdressing (0, 50, and 75 kg N ha(-1)). The experiments were conducted at 0, 7, 14, 21, 28, 35, 42, 56, 63, and 140 days after emergence (DAE) of chickpea/weed coexistence under two conditions: initially weed-free and initially weed-infested. The presence of weeds negatively affected chickpea production and reduced yields by 70% on average regardless of N rate, rendering the crop economically unfeasible. The CPWI ranged from 5 to 76 DAE and was not affected by N topdressing up to 75 kg N ha-1 in both crop years, assuming an acceptable production loss of 5%. Although the CPWI without fertilization (0 kg N ha(-1)) was similar to that when fertilized with 50 and 75 kg N ha(-1), the two topdressing doses increased chickpea productivity by 37% and 51%, on average, respectively. (AU)

Processo FAPESP: 10/14018-0 - Efeito de períodos de interferência das plantas daninhas na produtividade de grão-de-bico em resposta à adubação nitrogenada em cobertura
Beneficiário:Carita Liberato Do Amaral
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 10/07809-1 - Abordagens multivariadas e moleculares no estudo fenológico de grupos funcionais do cerrado
Beneficiário:Marcelo Claro de Souza
Linha de fomento: Bolsas no Brasil - Doutorado