| Full text | |
| Author(s): |
Fernandes, Adalton M.
[1]
;
Campos, Lucas G.
[2]
;
Senna, Marcal S.
[2]
;
da Silva, Carolina L.
[2]
;
Assuncao, Natalia S.
[2]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | AGRONOMY JOURNAL; v. 110, n. 5, p. 2004-2015, SEP-OCT 2018. |
| Web of Science Citations: | 1 |
| Abstract | |
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) | |
| FAPESP's process: | 17/11166-8 - Tuber yield and quality of potato crop in response to nitrogen fertilization management |
| Grantee: | Natália Silva Assunção |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 14/22362-4 - Green manure and nitrogen fertilization in sweet potato crop |
| Grantee: | Adalton Mazetti Fernandes |
| Support Opportunities: | Regular Research Grants |