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Methods of pruning and thinning in a flooded camu-camu plot

Jaime Durand-Valencia, Mario Herman Pinedo-Panduro, Elvis Paredes-Davila, Carlos Zumba Lopez, Luis Romero-Villacrez, Ricardo Bardales-Lozano, Dennis Del Castillo-Torres, Carlos Abanto Rodriguez, Edvan Alves Chagas, Valdinar Ferreira Melo.

Abstract
A 20-year-old camu-camu plot was studied to determine pruning-production and stand-thinning techniques with the objective of recovering its productive capacity in a floodable area. The evaluated treatments were: T1 "control" (without pruning and without stand-thinning), T2 (without pruning with stand-thinning per line), T3 (with pruning and stand-thinning per line), T4 (with pruning and selective stand-thinning). The distribution of plants in the field was not balanced and the INFOSTAT Program was applied for the non-parametric analysis of Kruskal and Wallis with 8 replicates. The response variables were: "number of flowers/plant" (NFL), "number of fruits in phase 3" (NFRF3), "number of fruits in phase 5" (NFRF5), "percentage of fallen fruits in phase 3 (% FRCF3), "percentage of fallen fruits in phase 5" (% FRCF5), "average fruit weight" (PPFR) and "fruit yield" (RFR). Significant differences were found between treatments for NFL, NFRF3, NFRF5,% FRCF3 and RFR with values: p = 0.0002, p = 0.0022, p = 0.0009, p = 0.0010 and p = 0.0010 respectively. The percentage of fruits fallen in % FRCF5 and PPFR, were not statistically influenced by the treatments.T2 reached higher values in all these variables. In the ten months of the trial, T2 induced a significantly higher fruit yield, evidencing the disadvantage of pruning and the efficiency of linear thinning in the short term. It is necessary to continue evaluating the next harvests in order to observe the fruit yield trends.

Key words: fruit abscission, plantation design, varzea



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