| Grant number: | 12/04775-4 |
| Support Opportunities: | Scholarships in Brazil - Master |
| Start date: | October 01, 2013 |
| End date: | July 31, 2014 |
| Field of knowledge: | Agronomical Sciences - Agronomy - Crop Science |
| Principal Investigator: | Pedro Luis da Costa Aguiar Alves |
| Grantee: | Fernanda Nunes Bressanin |
| Host Institution: | Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil |
Abstract The sugar cane is a major crop in Brazil. This culture extracts large amounts of soil nutrients and to partially restore fertility, producers have the option of using green manure during the reform of the sugar plantation. The velvetbean (Stizolobium aterrimum), one of the most suitable species as green manure, if not handled properly can become a weed and thus interfere directly and indirectly in the culture. One of the factors that will determine the level of interference is the period of coexistence between the crop and weeds. Three stand out: the total period of interference (PTPI), the period before interference (PAI) and critical period of interference (PCPI). Thus, the goal will be to determine interference periods of velvetbean in cane sugar and, knowing the periods, study which herbicides and methods of application are effective for its control. In periods of interference experiment will be applied 18 treatments separated into two groups In the first, from the 1st to the 9th treatment, the culture will remain free of weed interference from emergence up to seven times of its life cycle: 0-15 days 0-30 days 0-45 days 0-60 days 0-90 days, 0-120 and 0-150 days days, 0-180 days 0 harvest. In the second group, the 10th-18th treatment will proceed unlike the previous group in relation to weed control, ie, the culture will remain in coexistence with weeds from emergence up to the same periods described above. Does the experimental design used a randomized block design with four replicates per treatment. The results will be submitted to regression analysis, and interference periods determined considering 5% loss in production. To study the chemical control and mode of application will be mounted two experiments, one in the field and other vessels, repeating chemical treatments. For control mode pre-emergence herbicides are used amicarbazone (1175 g ha-1); tebuthiuron (900 g ha-1) and sulfentrazone (600 g ha-1) and post-emergence herbicides beyond the three previous will be used 2,4-D amine (670 g ha-1), atrazine (3250 g ha-1); carfentrazone-ethyl (35 g ha-1) and mesotrione (133 g ha-1) in three plant stage, 10, 30 and 60 days after emergence. For the experiment in pots, the experimental design is completely randomized, as the field will be randomized blocks, each with four replicates per treatment. The variables assessed (efficacy and phytotoxicity) will be submitted to analysis of variance by F test, and the means were compared by Tukey test at 5% probability. (AU) | |
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