Yield and nutrition of greenhouse-grown strawberries (Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier. cv. Camarosa) as affected by potassium fertilization

In strawberry, potassium fertilization has been little studied, which difficult management strategies for an increasing yield and understanding the use of this nutrient in strawberry crop. The aim of this study was to evaluate the influence of sources and rates of potassium (K) fertilizers on yield, K level and agronomic traits of strawberry cv. Camarosa fruit, carried out under greenhouse conditions. A randomized in a completely block design with four replicates in a factorial arranged 6x3 (six rates of potassium x three sources of potassium fertilizers), was performed. Fertilizers sources used were as follows: potassium sulphate, potassium nitrate and potassium chloride in 0, 60, 120, 180, 240 and 300 kg ha-1 K2O doses. An increasing potassium rates have allowed a higher potassium content in leaves and fruits. A higher potassium content in leaves was obtained by KNO3 (11.70 g kg-1). Yield, fruit number per plant and potassium extraction per plant, increased linearly with the evaluated doses and fruit average weight at a dose of 183 kg ha-1. There was no significant difference among potassium content in leaves. Strawberry production is maximized through potassium fertilization, independent of the source origin.En fresa, se ha estudiado poco la fertilización potásica, lo que complica las estrategias de manejo para aumentar la productividad, y para la comprensión de la utilización de este nutriente en el cultivo de la fresa. El objetivo de este estudio fue evaluar la influencia de las fuentes y dosis de fertilizantes de potasio (K) en el rendimiento, la concentración de K, y las características agronómicas de la fruta de fresa cv. Camarosa, cultivada en condiciones de invernadero. El diseño experimental fue completamente al azar, con cuatro repeticiones, en un 6x3 factorial (seis tasas de K x tres fuentes de fertilizantes potásicos). Las fuentes utilizadas fueron sulfato de potasio, nitrato de potasio y cloruro de potasio aplicado en las siguientes tasas: 0, 60, 120, 180, 240 y 300 kg ha-1 de K2O. Las tasas crecientes de potasio permitieron un mayor contenido de potasio en hojas y frutos. El contenido de potasio más alto a nivel foliar más alto fue obtenido a través de KNO3 (11,70 g kg-1). El rendimiento, número de frutos por planta y la extracción de potasio por planta, aumentó linealmente con las dosis evaluadas y el peso medio del fruto a una dosis de 183 kg. ha-1. No hubo diferencia significativa entre las fuentes de potasio para el contenido foliar de potasio. La producción de fresa se maximiza mediante la fertilización potásica, independientemente del origen de la fuente

Aplicação complementar de enxofre em diferentes doses na cultura do alho.

O objetivo deste trabalho foi avaliar o efeito da adubação complementar com enxofre elementar sobre a produtividade de bulbos em três cultivares de alho, bem como seu efeito em diversas caracteristicas ligadas à morfologia e crescimento do bulbo e da planta.Made available in DSpace on 2012-02-11T00:02:06Z (GMT). No. of bitstreams: 1 HB29n2p217a221.pdf: 369305 bytes, checksum: 4b6bac77ed28d63480c661537e3fbc14 (MD5) Previous issue date: 2011-08-01201

Yield and nutrition of greenhouse-grown strawberries (Fragaria × ananassa (Duchesne ex Weston) Duchesne ex Rozier. cv. Camarosa) as affected by potassium fertilization

In strawberry, potassium fertilization has been little studied, which difficult management strategies for an increasing yield and understanding the use of this nutrient in strawberry crop. The aim of this study was to evaluate the influence of sources and rates of potassium (K) fertilizers on yield, K level and agronomic traits of strawberry cv. Camarosa fruit, carried out under greenhouse conditions. A randomized in a completely block design with four replicates in a factorial arranged 6x3 (six rates of potassium x three sources of potassium fertilizers), was performed. Fertilizers sources used were as follows: potassium sulphate, potassium nitrate and potassium chloride in 0, 60, 120, 180, 240 and 300 kg ha-1 K2O doses. An increasing potassium rates have allowed a higher potassium content in leaves and fruits. A higher potassium content in leaves was obtained by KNO3 (11.70 g kg-1). Yield, fruit number per plant and potassium extraction per plant, increased linearly with the evaluated doses and fruit average weight at a dose of 183 kg ha-1. There was no significant difference among potassium content in leaves. Strawberry production is maximized through potassium fertilization, independent of the source origin

Postharvest quality of strawberry fruits produced in organic and conventional systems Qualidade pós-colheita de frutos de morangueiro produzidos em sistemas orgânico e convencional

The aim of this study was to determine some physicochemical characteristics of fruits of eight strawberry cultivars (Aromas, Camino Real, Campinas, Dover, Oso Grande, Toyonoka, Tudla-Milsei and Ventana) cultivated in organic and conventional systems. The evaluated characteristics were soluble solids (SS), titratable acidity (TA), SS/AT ratio and anthocyanins. Evaluated sensory characteristics were flavor and appearance. The cultivars had a differential performance between themselves and among the systems for the evaluated characteristics. Generally, the conventional system produced fruit with higher levels of soluble solids and, organic system produced higher concentrations of anthocyanins. The fruits of the cultivar Toyonoka had the best soluble solids content in both systems and the anthocyanins content of 'Tudla-Milsei' and 'Camino Real' were proeminent in comparison to the other cultivars. The fruits from the organic system of production were preferred by judges on the sensorial attributes. The highest notes were given to the appearance of the cultivar Ventana in the conventional system and 'Tudla-Milsei' in the organic system.<br>O presente trabalho teve como objetivo determinar as características químicas e sensoriais de frutos de oito cultivares de morangueiro (Aromas, Camino Real, Campinas, Dover, Oso Grande, Toyonoka, Tudla-Milsei e Ventana) provenientes de sistemas orgânico e convencional de cultivo. As características químicas avaliadas foram sólidos solúveis (SS), acidez titulável (AT), relação SS/AT e teor de antocianinas. As características sensoriais avaliadas foram sabor e aparência. As cultivares apresentaram um comportamento diferenciado entre si e frente aos sistemas de produção para as características avaliadas. De modo geral, o sistema convencional produziu frutos com maiores teores de sólidos solúveis e o sistema orgânico, maiores valores de acidez titulável e maiores concentrações de antocianinas. Os frutos da cultivar Toyonoka apresentaram o maior teor de sólidos solúveis nos dois sistemas de cultivo avaliados. Destaque para o teor de antocianinas das cultivares Tudla-Milsei e Camino Real. Quanto às características sensoriais, os frutos provenientes do sistema orgânico de produção foram preferidos pelos julgadores para os atributos avaliados. As maiores notas foram atribuídas para a aparência dos frutos da cultivar Ventana no sistema convencional e de 'Tudla-Milsei' no orgânico