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It is known that poorly performed fertigation directly impacts on tomato production and biometric components. In addition, consumers are also affected by interrelated characteristics that interfere with the acceptability of the fruit, such as the physicochemical parameters and nutrients in the fruit. Thus, eco-friendly technologies, such as irrigation with ultra-low frequency electromagnetic treated-water, which attenuates the inadequate management of fertigation, are essential to improve marketable fruit yields. Thus, the objective of the present work was to investigate the impact of treated water with very low-frequency electromagnetic resonance fields in physical, chemical and nutritional parameters at different nutrient solution strengths in tomato fruits. In this study, experiments were carried out in randomized blocks and five doses of fertigation were used (1.5; 2.5; 4.0; 5.5; and 7.0 dS m−1), employing two types of water: electromagnetically treated and untreated. It can be seen that the fertigation affected some parameters, mainly the number of fruits with blossom-end rot, fruit size, and weight. Variance analysis (ANOVA) was performed with the subsequent use of the Tukey test. In all statistical tests, a confidence level of 95% was considered. The soluble solids content increased by 28% as a function of the fertigation doses. The electromagnetically treated water reduced the number of fruits with blossom-end rot by 35% (p < 0.05). Overall, electromagnetic water improved the physicochemical quality parameters and the nutritional status of tomato fruits. Thus, this study demonstrated that green technology could leverage tomato fruit production and quality.

RESUMOO tomate é uma das principais hortaliças produzidas no Brasil, adaptando-se a praticamente todos os climas, porém está susceptível a diversas doenças que acarretam na redução da produtividade e da qualidade. Um dos segmentos mais importantes no mercado brasileiro é o tomate de mesa, entra nessa categoria o híbrido "BRS Imigrante", que é tolerante a doenças que causam prejuízos na produção. A clorofila está presente em todos os vegetais e é um dos fatores relacionados à eficiência fotossintética de plantas e como consequência ao seu crescimento, desenvolvimento e adaptação a diversos ambientes. O experimento foi conduzido em casa de vegetação na área experimental da empresa Proteto. Adotou-se o sistema de bloco ao acaso, com 10 avaliações ao longo do ciclo da cultura, com 3 repetições. A irrigação adotada foi em pulso, sendo que aproximadamente a cada 20 minutos ocorria o acionamento do sistema. Sendo avaliado. Visto a importância da clorofila, o objetivo desse trabalho foi analisar a clorofila A, B e Total por meio de dos índices SPAD A, B e total e investigar o seu comportamento ao longo do desenvolvimento da cultivar. Os índices SPAD analisados apresentaram correlações positivas e significativas entre eles.Palavras-chave: clorofilas; fotossíntese; tomate. SPAD INDEX IN TOMATOES PLANTS CULTIVATED IN COCONUT FIBER AND SUBMITTED TO FERTIRRIGATION PULSES ABSTRACTTomato is one of the main vegetables produced in Brazil, adapting to practically all climates, but is susceptible to several diseases that lead to reduced productivity and quality. One of the most important segments in the Brazilian market is table tomatoes, the 'BRS Imigrante', which tolerates some diseases that cause losses to the producer, falls into this category. Chlorophyll is present in all plants and is one of the factors related to the photosynthetic efficiency of plants and as a consequence of their growth, development and adaptation to diverse environments. Considering the importance of chlorophyll, the objective of this work was to analyze the SPAD A, B and total indices and to investigate their behavior throughout the development of the cultivar. Chlorophyll A, B and total contents were determined in ten evaluation dates after transplanting. The SPAD indices analyzed showed positive correlations between them.

Calcium and boron are important nutrients in pollen grain formation and seed production. As they are little mobile in plants, it is common to be supplied via foliar application. The objective of this research was to evaluate the production and quality of sweet pepper seeds with calcium and boron application directed to flowers and fruits. The experimental design was in randomized blocks, with seven replications. Four treatments were evaluated: isolated calcium (0.2%) application, isolated boron (0.1%) application, combined application of calcium (0.2%) and boron (0.1%), and the control without calcium and without boron. The characteristics evaluated were number of pollen grains, number of seeds per fruit; 1000 seed weight; physiological quality of seeds (germination, first germination count, and germination speed index) and protein (albumin, globulin, prolamine and glutelin) contents in seeds. Both the application of calcium and boron did not affect the physiological quality of the seeds. Boron application reduced seed production and the 1000 seed weight, while calcium application increased the number of pollen grains, seed production and seed albumin content, and, therefore, the application of calcium in the production of sweet pepper seeds is recommended.