A MAGNETIC device was designed and manufactured to assess the implications of using magnetized saline water for crop irrigation on plant growth parameters and properties of soils grown thereon. To reach this aim, four soil types differing in their textures and contents of soluble salts, were sampled, uniformly packed in PVC columns and then cultivated with wheat grains (Triticum aestivum L.). Two weeks later, plants received one of the following treatments for water irrigation i.e., tap water (0.4 dS m -1 ), magnetized tap water, saline water (7.5 dS m -1 ) and magnetized saline water at a rate of 100% of field capacity (FC) to collect water draining from each column. Significant improvements in both the growth and yield parameters of wheat as well as in the soil chemical properties (i.e. pH, EC e , Na + , Cl -, SAR, available N, P and K contents) occurred due to irrigation with the magnetized saline water compared to irrigation with the non-magnetized saline ones. This magnetized waters seemed to increase the leachability of salts downwards the soil columns. The corresponding increases attained by magnetized saline water were higher than those attained by magnetized tap water. Also, NPK contents increased significantly within the different plant parts owing to magnetizing the irrigation water. Moreover, phosphorus fertilizer use efficiency increased significantly due to the irrigation with the magnetized waters i.e., the saline or the non-saline one compared with those received the non-magnetized waters. In conclusion, magnetizing irrigation water of low quality might reduce its negative implications on the grown plants and minimize accumulation of salts with the surface top soil.
<p>Salinity is one of the main abiotic stress factors which limit the growth and productivity of plants, however, the nutritional status of plants is the first brick in the resistance wall against stresses. Therefore, a factorial experiment was undertaken to investigate effects of soil applied humic acid (0, 7, 14, 21 l.ha<sup>-1</sup>) and boron foliar spraying (0, 50, 100 ppm) and their interaction on growth and yield of melon plant under saline conditions. The results suggested that the treatments soil application of humic acid and the boron spraying successfully mitigated the deleterious effects of salt stress and influenced growth and yield of melon plant. Humic acid at 21 l.ha<sup>-1</sup> or boron spray at 50 ppm exhibited an improvement in growth and yield of melon, in terms of plant length, plant fresh and dry mass, chlorophyll (SPAD), fruit mass, total yield, and also leaf nutrient content (N and K) and total soluble solids (TSS) of fruits, while reduced the sodium content of leaves. The combined treatment of humic acid at 21 l.ha<sup>-1</sup> and boron spraying at 50 ppm was found to be more effective for the melon plant to improving growth performance and the crop yield by 21 % as compared with the control group under saline conditions.</p>
he implementation of proper agricultural practices is important for reducing the effect of salt stress in plants. Therefore, this experiment was conducted in 2014/2015 and 2015/2016 seasons at Ras Sudr station of Desert Research Center, South Sinai Governorate, Egypt, to determine the most effective selenium (Se) dose and application method on lettuce plants Bruma cultivar under salt stress conditions. Six different Se treatments; Se0 (without application as a control), Se1 (seed soaking in 30 µmol l -1 for 12 h), Se2 (seed soaking in 50 µmol l -1 for 12 h), Se3 (foliar application of 10 µmol l -1 ), Se4 (foliar application of 20 µmol l -1 ) and Se5 (foliar application of 30 µmol l -1 ) were applied. The results showed that Se provision through both of the tested methods improved the plant leaf number, chlorophyll content, as well as N, P, K and Ca concentrations in the leaves, when compared with the control treatment. Moreover, Na content decreased in the leaves, which were treated than those of the control treatment. The plants grown under the Se treatments had larger heads and higher yields than the untreated plants. Foliar spraying was the most effective method of Se application of the lettuce plants, and the best results were obtained with the foliar spraying treatment at 20 µmol l -1 sodium selenate. These results suggest that applying the appropriate dose of Se via foliar spraying has the potential for use as an efficient and practical method of improving plant growth and enhancing salt-stress resistance in lettuce plants.
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