Plant Abiotic Stress Tolerance: Agronomic, Molecular and Biotechnological Approaches., Hasanuzzaman,M.,Hakeem,K.R.,Nahar,K.,Alharby,H., Editör, Springer, London/Berlin , Singapore, ss.357-379, 2019
This study was carried out in order to determine the effects of different salinity levels and leaching ratios on plant growth, yield and quality, water consumption of gerbera grown by soilless culture. The research was conducted to include two separate production periods (1st and 2nd production periods). The experimental design was a randomised split plot with three replicates. Four nutrient solution salinity levels (S0: Control, S1: S0+1dS/m, S2: S0+2dS/m, S3: S0+3 dS/m) and two leaching ratios (drainage volume / applied nutrient solution volume; 25%: LR25 and 50%: LR50) in soilless culture open system were tested during the research. Except for the control treatment (S0), the electrical conductivities of the solutions in the other three treatments were above the control by adding NaCl. Gerbera (Gerbera jamesonii cv. Skylina) was used as plant material and agricultural perlite was used as growing media. The results showed that there was no significiant difference between leaching ratios in respect to yield and flowers quality parameters in both growing seasons, whereas yield decreased dramatically with the increase of salinity. It has been found that the highest yield received from the control treatment (S0) in which no additional salts were applied, while the lowest yield was obtained from the highest salt concentration treatment (S3) in both growing seasons. According to the results, both the number and the weigth of flowers decreased as the salinity of nutrient solution increased. In particular, higher ratio of leaching in saline conditions provided more yield, i.e. flower number, in both seasons. This result showed that the leaching ratio was an application to reduce the salt effect. It was determined that in 1st and 2nd season, the calculated salinity threshold values were between 1.4-2.1 dS m-1 for the EC of nutrient solution and 1.7-2.8 dS m-1 for the EC of drainage solution. It has been found that Gerbera plant is moderate sensitive to salinity.
Keywords: Gerbera, salinity, leaching ratio, threshold value, yield, quality.