Azhar Mahdi Abdul-Sahib; Mohammad Golbashy; Jamal Abbass
Abstract
This study evaluated the effects of date palm wastes + soil (1:1 v/v), perlite + soil (1:1 v/v) and soil with no additive, along with the spraying of MgSO4.7H2O at (0, 50 and, 100 mg. L-1) on the growth and flowering of potted Gerbera. The results showed that adding date palm wastes to the soil significantly ...
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This study evaluated the effects of date palm wastes + soil (1:1 v/v), perlite + soil (1:1 v/v) and soil with no additive, along with the spraying of MgSO4.7H2O at (0, 50 and, 100 mg. L-1) on the growth and flowering of potted Gerbera. The results showed that adding date palm wastes to the soil significantly increased plant height to 30.36 cm, number of leaves (6.91), branches (11.35) and suckers (3.39/ plant). Also nitrogen, phosphorus and potassium contents in leaves recorded: 2.18 %, 0.28 %, and 2.34 %, respectively. Leaf dry matter raised to 20.63 % as well. Moreover, adding date palm wastes+ soil increased chlorophyll, carbohydrates, and protein contents in leaf to 1.76 mg/g. fresh wt., 14.14 % and 13.64 % respectively, as well as flower stalk diameter to 0.346 cm and the vase life to 12.26 days. Magnesium improved plant height to 27.75 cm, number of suckers to 3.05/ plant and leaf area to 136.3 cm2. Likewise, there were increases in N (1.96 %), P (0.25 %), and K (2.03 %), chlorophyll (1.45 mg/g. fresh wt.), carbohydrates (13.27 %) and protein (12.28 %). The flower stalk diameter became thicker when increasing the concentration of Mg and scored 0.393 cm. Also, Mg at 100 mg. L-1 raised vase life to 11.08 days. Some interferences between the media and magnesium treatments were significantly effective as the longest vase life (12.79 days) occurred in plants grown on date-palm wastes+ soil and were treated with 100 mg. L-1 of Mg.
Hamid Alipour
Abstract
Understanding mechanisms of salt tolerance, physiological responses to salt stress, and screening genotypes for breeding programs are important scientific issues remained to be investigated in pistachio. Therefore, current study was carried out to investigate response of different pistachio cultivars ...
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Understanding mechanisms of salt tolerance, physiological responses to salt stress, and screening genotypes for breeding programs are important scientific issues remained to be investigated in pistachio. Therefore, current study was carried out to investigate response of different pistachio cultivars (G1, G2, Kaleghochi and UCB1) to salinity treatments (0.6 as control, 10, 20 dS m-1 using saline underground water) as a factorial experiment based on randomized complete block design with three replications in greenhouse of Iranian Pistachio Research Institute (Rafsanjan) in 2014-2015. Some physiological and nutrition properties of the pistachio cultivars measured in this study. Results showed decreased stomatal conductance, photosynthesis rate, chlorophyll content, and Fv/Fm in response to salinity treatments. The main cause of these changes was related to the altered ion contents along with the competition among ions for being absorbed by plant. Despite of sufficient amount of potassium in the soil, high concentrations of sodium and other associated elements such as calcium and magnesium decreased the ability of pistachio plants to absorb adequate amount of vital ions such as potassium. As a result of sodium accumulation and deficiency of potassium, K+/Na+ ratio was decreased in pistachio leaves. Consequently, toxicity of sodium ions in the plant cells reduced stomatal conductance and the rate of photosynthesis. Comparison between cultivars showed that for the most of the traits the difference between control and moderate salinity (10 ds m-1) in all cultivars was not significant. However, G2 cultivar showed higher ability to accumulate potassium and absorbed lower concentration of sodium, calcium, and magnesium under sever salinity treatment (20 ds m-1). These result suggested that G2 could be considered as a potential tolerant cultivar for cultivation in saline area.
