Douglas Junior Bertoncelli

Chemical characteristics of fruits of two species of Physalis under nitrogen fertilization

Although small fruits, with some exceptions, are not yet as popular in Brazil, some farmers have invested in this market and the genus Physalis can be an important alternative source of income due to its high added value and possibility of cultivation in small areas. To date, there are no specific fertilizer recommendations for even the most cultivated species (Physalis peruviana) and therefore the goal of this study was to evaluate the effects of nitrogen fertilization on quality of fruits of Physalis peruviana and Physalis pubescens. Plants were grown in 5 L pots containing soil and maintained in a controlled environment, in greenhouse. Treatments consisted of five N levels (kg ha -1 ): 0, 200, 250, 300 and 350, with seven replicates per treatment. Variables evaluated were total soluble sugars and reducing sugars, phenolics, pH, titratable acidity and fruit diameter. Nitrogen increased soluble sugars (350 kg ha -1 ) and reducing sugars (300 kg ha -1 ), mainly in P. pubescens. There was a slight increase of juice pH, but concentrations of total phenols and citric acid decreased with increasing levels of N. Fruit diameter of the two species of Physalis was increased by N fertilization, and the best N level was 300 kg ha -1 .

Efeito residual de herbicidas pré-emergentes no desenvolvimento inicial e na composição bioquímica de plântulas de feijão-vagem

Received: March 23, 2017. Accepted: October 19, 2017. 1 Universidade Estadual de Londrina – UEL, Rodovia Celso Garcia Cid, Pr 445, Km 380, CEP 86057-970, Londrina, PR, Brazil. E-mail: ffavorettofurlan@gmail.com; gustavo-freiria@hotmail.com; dj_bertoncelli@hotmail.com; monica_omura@hotmail.com; veronicapellizzaro@hotmail.com 2 Departamento de Agronomia, Universidade Estadual de Londrina – UEL, Londrina, PR, Brazil. E-mail: luciasadayo@gmail.com Abstract The use of herbicides must be made in a rational way, giving priority to reduce possible adverse effects on subsequent crops. The objective was to evaluate the residual effect of pre-emergent herbicides on growth and initial development as well as the biochemical composition of snap bean seedlings. The experimental design used was the completely randomized, with four replications in factorial scheme 3x4, three snap bean cultivars (Macarrão Favorito, Macarrão Preferido e Macarrão Trepador) and three pre-emergent herbicides, plus a control (without herbicide). Was use the residual doses of pre-emergent herbicides sulfentrazone in 0.3 g ha-1, diclosulam in the concentrations of 0.126 g ha-1 and imazethapyr in 0.05 g ha-1. The work was developed in a seeds analyze laboratory with the purpose of minimizing possible adverse effects of the environment. The seeds were sowing on germitest paper moistened with solutions containing the herbicides, with each respective treatment. The following characteristics were evaluated: germination (GER), germination speed index (GSI), seedling length (SL) and seedling dry mass (SDM) and soluble protein content (PROT) in addition to the enzymatic activity of catalase (CAT), peroxidase (PER) and phenylalanine ammonia-lyase (PAL). The phytometric variables SL, SDM, GER and GSI reduced in the presence of herbicides, and for the levels of PROT and enzymatic activity of CAT, PER and PAL there was observed a variation according to the genotype. The sulfentrazone showed up as the product of higher toxicity, as well as the Macarrão Trepador as the genotype with lower tolerance.

Allelopathic Potential of the Aqueous Extract of Raphanus sativus L. on the Germination of Beans and Corn Seeds

The plants synthetize a big quantity of chemically diverse compounds, which discharged into the environment influence in a decisive manner in the species dynamics that form the agroecosystems, phenomenon denominated allelopathy. The study had the aim of ...

Salycilic acid application in postharvest cabbage leaves butter

Considerando a escassez de trabalhos relacionados a pos-colheita de couve manteiga e a inexistencia de avaliacao com indutores de resistencia na especie, objetivou-se com o presente trabalho avaliar o efeito do acido salicilico na pos-colheita de couve manteiga sobre as variaveis fisico-quimicas e bioquimicas. O experimento foi conduzido na Universidade Tecnologica Federal do Parana – Câmpus Dois Vizinhos. Foram utilizados cinco tratamentos em delineamento inteiramente ao acaso. Os tratamentos consistiram no uso de solucao com quatro concentracoes de acido salicilico (0,5; 1,0; 1,5; e 2,0 mM) e a testemunha (agua destilada), em quatro repeticoes de oito folhas. Apos a colheita, selecao e padronizacao das amostras, as bases das folhas de couve manteiga foram imersas nas solucoes com os diferentes tratamentos, durante dez minutos. As folhas foram mantidas em incubadora B.O.D., durante 192 horas, a temperatura de 8oC. As variaveis utilizadas para avaliacao do experimento foram a perda de massa da materia fresca, podridoes, teor de vitamina C, clorofilas, fenois totais, proteinas totais e atividade das enzimas peroxidases e fenilalanina amonia-liase (FAL). A aplicacao de AS manteve os teores de proteinas e fenois totais em niveis mais elevados, bem como interferiu na atividade das peroxidases e FAL. Os tratamentos nao apresentaram efeito sobre a perda de massa da materia fresca, o teor de vitamina C, clorofilas e podridoes.