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| Author(s): |
Natália Silva Assunção
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Botucatu. 2020-04-27. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agronômicas. Botucatu |
| Defense date: | 2020-03-06 |
| Advisor: | Adalton Mazetti Fernandes; Rogerio Peres Soratto |
| Abstract | |
Optimizing the management of nitrogen (N) fertilization with supply of N in the period of greatest demand for plants can be a strategy to maximize the yield and quality of tubers in the potato crop (Solanum tuberosum L.). Thus, the objective of this work was to evaluate the yield and the physico-chemical and nutritional quality of the tubers of potato cultivars Agata and Markies submitted to different forms of management of traditional N fertilization combined with N application rates at the tuber bulking stage. Four experiments were conducted with the cultivars Agata and Markies during the winter growing season of the 2017 and 2018 years. The 2018 area was not the same as the previous year, and both experiments were located in potato producer areas in Botucatu-SP. The experimental design adopted in all experiments was in randomized blocks with a 4 x 4 factorial scheme, with four replications. The forms of management of traditional N fertilization were: M1 = 160 kg N ha-1 at planting; M2 = 80 kg N ha-1 at planting; M3 = 40 kg N ha-1 at planting plus 120 kg N ha-1 at hilling; M4 = 80 kg N ha-1 at planting plus 80 kg N ha-1 at hilling, combined with rates of 0, 20, 40, and 80 kg N ha-1 applied at tuber bulking stage. The forms of traditional N fertilization management combined with the N rates at tuber bulking stage did not cause N deficiency in potato plants in both cultivars, when leaf sampling was performed at the time indicated for the crop. In the cultivar Markies, application of N at tuber bulking stage increased the leaf N concentration. The forms of application of traditional N fertilization and the supply of N at tuber bulking stage, for the cultivars Agata and Markies, had little influence on the yield and the physico-chemical and nutritional characteristics of the tubers. The cultivar Markies was more responsive to the application of N fertilizer for the yield parameters, so that the application of 160 kg N ha-1 only at planting or evenly splited between the planting and the hilling showed better tuber yield. The cultivar Agata showed relatively lower yields when 80 kg N ha-1 was applied only at planting. Under the conditions of cultivation of this work, supply of N at tuber bulking stage did not show to be efficient in increasing the yield and quality of tubers of both evaluated cultivars. (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 |