Efectos de la nutrición y el riego en la producción de pimiento en toba volcánica

In this study aimed at increasing sustainability in soilless cultivation, volcanic tuff was used as substrate and the tested plant material was blocky type pepper (cv. 4-Ever F1). Three experimental factors were evaluated: cultivation system (open or closed), nutrient composition (N1, N2, N3, N4) and irrigation frequency (I1, I2, I3, I4). Macro nutrient concentrations of N2, N3 and N4 were 2-, 3- and 4-fold of N1. Concentrations of micronutrients were the same for all treatments. Irrigation was started when indoor solar radiation reached 6, 4, 2 and 1 MJ m–2 in the treatments I1, I2, I3 and I4, respectively. As a sustainable soilless technique, closed system was found to be recommendable by incorporating the treatment N4 + I2 to provide high yield and quality for blocky type pepper production. In the case of an open system, N2 + I4 proved to be the most efficient strategy.El objetivo de este estudio fue aumentar la sostenibilidad en un cultivo sin suelo, utilizando como sustrato toba volcánica y como material vegetal pimiento tipo rectangular (cv. 4-Ever F1). Se evaluaron tres factores experimentales: sistema de cultivo (abierto o cerrado), composición de nutrientes (N1, N2, N3, N4) y frecuencia de riego (I1, I2, I3, I4). Las concentraciones N2, N3, y N4de macro nutrientes fueron 2, 3 y 4 veces las de N1, siendo las concentraciones de micronutrientes las mismas para todos los tratamientos. El riego se inició cuando la radiación solar bajo cubierta alcanzó 6, 4, 2 y 1 MJ m2 en los tratamientos I1, I2, I3 e I4, respectivamente. Como técnica de cultivo sin suelo sostenible, en el sistema cerrado los tratamientos que proporcionan mayor rendimiento y calidad de pimiento son N4 + I2. En el caso de sistema abierto, la estrategia más eficiente es utilizar los tratamientos N2 + I4

Effect of nitrogen fertilizer timing and source on some yield and quality parameters of durum wheat (Triticum durum)

As the energetic cost of synthesizing nitrogen (N) fertilizers is very high, management of N fertilizer is important for reducing costs and soil pollution, while increasing grain yield and quality. N fertilizing (form, application timing, dosage and source) has important effect on the quality of wheat. In this study, a field experiment was designed to study the effects of application type (timing and source) of N fertilizer on grain yield and quality in durum wheat (Altar-84, Gediz-75, Ege-88, Ki{dotless}zi{dotless}ltan-91, and Kunduru-1149). The experiments were conducted in split plot arrangement with four replications in Bornova and Menemen locations during two growing seasons. In all the plots, single rate of 16 kg/da N fertilizer was applied with different application timing (stem elongation and heading stages) and sources (ammonium nitrate and urea). Results from analyses of variance indicate that there were significant differences among cultivars in all studied characteristics (grain yield, 1000-kernel weight, test weight, grain protein content, SDS-sedimentation) in all environments. Effect of N fertilizer application type on yield, 1000-kernel weight, test weight, grain protein content and SDS-sedimentation, varies depending on year and location. It was found that Ege-88 had the highest grain yield and 1000-kernel weight and Kunduru-1149 had the highest protein content and SDS-sedimentation potential in compare to other cultivars. By considering the mean values for all locations and years, it can be understood that application of N fertilizer as foliar urea led to increase in protein content of all cultivars except for Altar-84, while application of ammonium nitrate only led to increase in protein content of Kunduru-1149 cultivar over all locations and years

Effects of nutrition and irrigation on sweet pepper production in volcanic tuff

In this study aimed at increasing sustainability in soilless cultivation, volcanic tuff was used as substrate and the tested plant material was blocky type pepper (cv. 4-Ever F1). Three experimental factors were evaluated: cultivation system (open or closed), nutrient composition (N1, N2, N3, N4) and irrigation frequency (I1, I2, I3, I4). Macro nutrient concentrations of N2, N3 and N4 were 2-, 3- and 4-fold of N1. Concentrations of micronutrients were the same for all treatments. Irrigation was started when indoor solar radiation reached 6, 4, 2 and 1 MJ m�2 in the treatments I1, I2, I3 and I4, respectively. As a sustainable soilless technique, closed system was found to be recommendable by incorporating the treatment N4 + I2 to provide high yield and quality for blocky type pepper production. In the case of an open system, N2 + I4 proved to be the most efficient strategy.El objetivo de este estudio fue aumentar la sostenibilidad en un cultivo sin suelo, utilizando como sustrato toba volcánica y como material vegetal pimiento tipo rectangular (cv. 4-Ever F1). Se evaluaron tres factores experimentales: sistema de cultivo (abierto o cerrado), composición de nutrientes (N1, N2, N3, N4) y frecuencia de riego (I1, I2, I3, I4). Las concentraciones N2, N3, y N4de macro nutrientes fueron 2, 3 y 4 veces las de N1, siendo las concentraciones de micronutrientes las mismas para todos los tratamientos. El riego se inició cuando la radiación solar bajo cubierta alcanzó 6, 4, 2 y 1 MJ m2 en los tratamientos I1, I2, I3 e I4, respectivamente. Como técnica de cultivo sin suelo sostenible, en el sistema cerrado los tratamientos que proporcionan mayor rendimiento y calidad de pimiento son N4 + I2. En el caso de sistema abierto, la estrategia más eficiente es utilizar los tratamientos N2 + I4