Yield and Nitrogen Use Efficiency of Sweet Potato in Response to Cover Crop and Nitrogen Management

Autor(es)

Fernandes, Adalton M. ^[1] ; Campos, Lucas G. ^[2] ; Senna, Marcal S. ^[2] ; da Silva, Carolina L. ^[2] ; Assuncao, Natalia S. ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Ctr Trop Roots & Starches CERAT, Lageado Expt Farm, POB 237, BR-18610307 Botucatu, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Coll Agr Sci, Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AGRONOMY JOURNAL; v. 110, n. 5, p. 2004-2015, SEP-OCT 2018.
• Citações Web of Science: 1

Resumo

Selected cover crops can provide N to sweet potato (Ipomoea batatas {[}L.] Lam) crops cultivated in succession and reduce the need for mineral N application. This study was conducted to determine the growth, leaf N concentration, N uptake, N removal, storage root yield, and N-use efficiency of sweet potato crop in response to different cover crop sources and mineral N fertilizer rates. A field experiment was performed over 2 agricultural yr using a randomized complete block design with split-plots and four replications. Whole plots consisted of four cover crops: One control (spontaneous weeds), two legumes (Crotalaria spectabilis and Mucuna aterrima), and one cereal (Pennisetum glaucum). Subplots consisted of four N rates (0, 50, 100, and 200 kg ha(-1)) applied to the sweet potato. When no N was applied, M. aterrima supplied more N to sweet potato grown in succession but had the same effect as C. spectabilis on root yield. P. glaucum and spontaneous weeds had the same effect on the N supply and performance of sweet potato. The N rates for the optimum root yield of sweet potato were 49.6 and 76.6 kg N ha(-1) when grown after legume and non-legume species. In tropical conditions, the use of legumes as cover crops reduced the need for mineral N fertilizers by up to 35.2% for sweet potato. The cultivation history of a field should be an important consideration when determining the N fertilization for sweet potato because a high N supply favored the growth of vegetative plant parts. (AU)

• Processo FAPESP: 17/11166-8 - Produtividade e qualidade da batata em resposta ao manejo da adubação nitrogenada
• Beneficiário: Natália Silva Assunção
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/22362-4 - Adubação verde e nitrogenada na cultura da batata-doce
• Beneficiário: Adalton Mazetti Fernandes
• Modalidade de apoio: Auxílio à Pesquisa - Regular