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Interference periods of Pilea microphylla on Eugenia brasiliensis

Grant number: 14/26402-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): July 01, 2015
Effective date (End): June 30, 2016
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal researcher:Pedro Luis da Costa Aguiar Alves
Grantee:Vinicius Marin Diniz
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

The family Myrtaceae stands out between the fruitful plants cultivated due it´s important economic, nutritional and pharmaceutical, and among they figure the yellow grumixama (Eugenia brasiliensis), arboreal plants characteristic from the pluvial Atlantic Forest, very rare. The production of the seedling in nursery favors diverse factors, providing the major control of some essential conditions for the good development of seedlings. However, the management of the weed plants have been one of the major problems of production, among they Pilea microphylla (brilhantina) stands out for it's generalized occur and easy spread. Thus, this work aim: a) determined the previously period to interference (PPI), total period of prevention to interference (TPPI) and , as a consequence, critic period of interference prevention (CPPI) of weed in yellow grumixama seedling; b) study the possibility of brilhantina chemical control and c) evaluate the selective of herbicide for grumixama. The present work is divided in three phases. The first phase will determine PPI, TPPI, CPPI of the weed plant about the culture during eight months of seedling development under nursery, using 16 treatment (0-30, 0-60, 0-90, 0-120, 0-150, 0-180, 0-210 e 0-240 days in coexistence or not) willing completely randomized design with five repetition. They will be monthly evaluated: height, stalk diameter, number of leafs, chlorophyll relative content, fluorescence (Fv/Fm), leaf area, stalk and leaf dry mass. The second will evaluated the efficient of herbicides amônio-glufosinato (800 g.i.a. ha-1); carfentrazone-ethyl (50 g.i.a. ha-1); glyfosate (720 g.i.a. ha-1); isoxaflutole (150 g i.a. ha-1); oxyfluorfen (720 g.i.a. ha-1); setoxydim (184 g i.a. ha-1) e bentazon (900 g.ia. ha-1) in brilhantina control. The treatments will be completely randomized with five repetitions. From seven to thirty five days after application (DAA), in interval week, will be attributed control note and in the end will determined dry mass of remaining plants. The third phase will evaluate the herbicide selective more efficient in brilhantina control for grumixama yellow seedling. The experimental design will be completely randomized with treatment in five repetitions. After five days of treatment application and, after, in interval biweekly will be realized evaluations of toxicity, height, stalk diameter, number of leafs, chlorophyll relative tenor, fluorescence (Fv/Fm). In the end, 60 DAA, will be evaluated leaf area and dry mass of leafs and stalk of remaining plants. The collected data in three phases will be submit to ANOVA for F test, and the medias will be compared to 5% Tukey Test. When relevant, will be submit to regression analyzed, wherein to determine PPI, TPPI and CPPI utilize the sigmoidal model of Boltzmann. (AU)

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