Effect of nitrogen and planting dates on yield and yield components of head lettuce grown in soilless culture

The objective of this study was to determine the effect of different N applications with different planting dates on yield, leaf nutrients and some quality parameters of head lettuce (Lactuva saliva L. var. capitata cv. Bombola) grown in substrate-culture. The experiment was conducted in an unheated plastic polyethylene (PE) covered greenhouses of the Ege University Bayindir Vocational Training School in Turkey during the winter-early spring of 2016-2017. The trial was established in a randomized block design (RBD) with four replications. In this study, the development and yields of iceberg seedlings, grown at four different planting dates (8th and 23th of February; 9th and 23th of March), were determined under three different nitrogen applications (75, 150, and 250 mg N L-1). The results showed that the studied traits were affected by the treatments, so that the highest yield (334g head(-1)), number of leaves (39), DW (436%), and Vit.C (13.45%) was obtained on 23th of Feb. (second planting date). According of Nitrogen applications, highest yield (399g/head), number of leaves (40), DW (5.13%) was found in 150 mg L-1 N application. Overall results indicated that the most suitable cultivation period for iceberg was February, which was the first (8th Feb.) planting date in this current study. Second planting date of experiment (23rd Feb.) was also acceptable for the suitable cultivation. It was also concluded that 75-150 mg N L(-1 )applications could be recommended for the nutrition of iceberg in soilless culture.This study was supported by the Ege University Science and Technology Centre EBILTEM (Project no: BAMYO 2015-002).Ege University Science and Technology Centre EBILTEM [BAMYO 2015-002

The potential for using different substrates in green roofs

This research was carried out in Izmir-Turkiye and investigated the potential of using three different substrates (cocopeat, loofah and perlite) in the design of green roofs with succulents (Crassula ovata) in aim to improve their performance. In this research, four different groups (G1: Soil-Cocopeat, G2: Soil-Loofah, G3: Soil-Perlite and G4: Soil) were created according to the plant growing media used in the planting layer. The researchers conducted measurements of the drained irrigation water’s EC (Electrical Conductivity) value, pH value and drainage amount, the plant growing media’s temperature and moisture, the plant’s height and leaf number, and the amount of subsidence in the planting layer. In line with the results obtained from the evaluations of the analyses, it is possible to say that perlite (G3) offers more advantages than its alternatives in terms of many variables. However, according to the conclusive results, it has been understood that the use of a single type of substrate as plant growing media would not be sufficient to encourage the maximum performance of green roofs. To ensure that, considering the advantages of each substrate group, it is proposed that their combined use would be more beneficial