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Performance of tomato hybrids for fresh market in relation to training systems and planting densities Two experiments were conducted under field conditions with the objectives of (a) determining the effect of training and staking systems of plants on yield potential and yield components of fresh market tomato hybrids of indeterminate growth habit of varietal segments Salad Extended Shelf Life (SLV) and Santa Cruz (SC) (Experiment 1), and (b) evaluating the effect of spacing between plants in the single-stem training system with polypropylene wire on yield and yield components for hybrids of segment SLV (Experiment 2). In experiment 1 it was adopted the randomized block design with the treatments in a 5 x 2 factorial scheme, and four replications, being evaluated three SLV hybrids and two SC hybrids in two systems of plant training. In experiment 2, the experimental design used was also randomized blocks with the treatments in a 2 x 4 factorial scheme, and four replications, being evaluated two SLV hybrids. The experiments were conducted in Itatiba, SP, from July 2007 to January 2008, and from January to July 2009. All plants of each plot were considered and the total number of fruits (NTF), the total production per plot (PTP), the mass of discarded fruits (MFD), the number of commercial fruits (NFC), the commercial production (PCO), the production per plant (PPP), the average mass of fruits (MMF) and the marketable fruit mass of classes AAA, AA and A, for both segments were evaluated, as well as the number of fruits with radial cracking (RAD), concentric cracking (CON), open locules with exposed seed (LAB), blotchy appearance (MAN), puffiness (OCO), and deformed (DEF). It was found that, the training system with one plant per hole, conducted with two stems staked with bamboo, provided increment of NTF, NFC and PPP, for both segments in comparison to the system of a single plant per hole with one stem trained with a propylene wire. The staking system with bamboo, for both segments, provided a smaller MMF and the mass of fruits of classes AAA and A was also lower in relation to the system with a propylene wire. The hybrid ‘Forty’ showed lower MFD due to lower MAN in the staking system with bamboo. It was not found any difference between the two handling systems for PTP, PCO, LAB and for the mass of the fruits of class AA, for the two market segments. In experiment 2, there was no difference between the hybrids studied in different planting densities for production and for the majority of its components, except for PPP, in which ‘Forty’ was shown to be superior than ‘Valenty’, and for MFD, in which ‘Valenty’ exceeded ‘Forty’ due to the greater frequency of LAB. The smaller spacing between plants provided larger NTF, PTP, NFC, PCO, and a mass of the fruits of classes AA and A for both hybrids, as well as a smaller MFD, PPP, MMF, a mass of fruits class AAA, and also a lower number of fruits with RAD and MAN for both hybrids. It was also found that, for both hybrids, under wider spacing between plants the occurrence of fruits with LAB significantly decreased.

Desempenho de híbridos de tomate de mesa em função de sistemas de condução e da densidade populacional