Saeed Alah Tavakoli; Abdolhossein Abootalebi Jahromi; Abdolrasoul Zakerin; Abdolkarim Ejraei; Hamed Hassanzadeh Khankahdani
Abstract
Plant growth in hydroponic systems is affected by the nutrient solution concentration. The present study evaluated the effects of nitrogen (N) and potassium (K) on the concentration of some nutrients, chemical fruit qualities, and yield in tomatoes (Solanum lycopersicum, cv. Hirad). The experiment was ...
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Plant growth in hydroponic systems is affected by the nutrient solution concentration. The present study evaluated the effects of nitrogen (N) and potassium (K) on the concentration of some nutrients, chemical fruit qualities, and yield in tomatoes (Solanum lycopersicum, cv. Hirad). The experiment was arranged as a completely randomized design with four treatments (T1: N160 + K350 ppm at the vegetative stage and N130 + K250 ppm at the reproductive stage, T2: N170 + K360 ppm at the vegetative stage and N140 + K260 ppm at the reproductive stage, T3: N180 + K370 ppm at the vegetative stage and N150 + K270 ppm at the reproductive stage and T4: N190 + K380 ppm at the vegetative stage and N160 + K280 ppm at the reproductive stage). Results indicated that higher N and K supplies in the nutrient solutiondecreased Ca, Na, Mn, and Zn concentrations in leaf samples. In contrast, the concentration of various elements in fruits was unaffected by the increase in N and K (except for Cu). The second treatment (T2) had the most beneficial effect on the Cu concentration in tomato leaves and fruits. The increase in total soluble solids, chlorophyll, lycopene, and total acids could improve fruit quality in tomato fruits. The best treatment in the present study was N170 + K360 ppm at the vegetative stage and N140 + K260 ppm at the reproductive stage.
Asghar Sadeghi Chah-Nasir; Abdolhossein Abootalebi Jahromi; Behnam Behrooznam; Hamed Hassanzadeh Khankahdani; Abdolkarim Ejraei
Abstract
The foliar application of organic compounds and biofertilizers is a suitable method for optimal nutrition of plants. This study aimed to investigate the effect of the foliar application of humic acid and amino acids on the quantitative and qualitative characteristics of tomato fruits under field conditions ...
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The foliar application of organic compounds and biofertilizers is a suitable method for optimal nutrition of plants. This study aimed to investigate the effect of the foliar application of humic acid and amino acids on the quantitative and qualitative characteristics of tomato fruits under field conditions in 2019-2020. The treatments included the control, three concentrations of humic acid (1, 2, and 3 g L-1), three concentrations of amino acids (2, 4, and 6 g L-1), and combined treatment of humic acid (3 g L-1) + amino acid (3 g L-1). The results showed that the effect of the treatments on plant fresh and dry weight, leaf chlorophyll content, fruit number, total yield and marketability, and fruit quality except the fruit length was significant. The highest leaf pigment content, fruit number (30.3 per plant), yield (50.3 tons ha-1), and marketable yield (43.1 tons ha-1) were related to the combined treatment of humic acid + amino acids. Furthermore, the highest fruit quality characteristics such as firmness, TSS, vitamin C, anthocyanin, and potassium were observed for the humic acid at 3 g L-1, which showed no significant difference with the combined treatment of humic acid + amino acid. In general, it was found that the foliar application of organic compounds improved the yield, yield components, and fruit quality of tomato plants, so that the combined application of humic acid (3 g L-1) + amino acids (3 g L-1) had the highest effect on improving the quantitative and qualitative characteristics of tomato plants.
Ali Hatami; Abdolhossein Abootalebi Jahromi; Abdolkarim Ejraei; Abdol Hossein Mohammadi Jahromi; Hamed Hassanzadeh Khankahdani
Abstract
Due to the calcareous nature of most soils in areas under date cultivation, this study was conducted to improve the quality and quantity of date fruits in Zahidi cultivar using the foliar applications of organic matters and micronutrients at two stages of date growth. For this purpose, an experiment ...
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Due to the calcareous nature of most soils in areas under date cultivation, this study was conducted to improve the quality and quantity of date fruits in Zahidi cultivar using the foliar applications of organic matters and micronutrients at two stages of date growth. For this purpose, an experiment was conducted to evaluate the effects of foliar applications of organic matters and micronutrients on contents and properties of biochemical compounds and minerals in Zahidi date fruit. The study was performed as a randomized complete block design with 11 treatments in three replications on 33 date palms for two consecutive years. The treatments were applied in two stages (at the beginning and end of the Kimri stage) on fruits and upper leaves. Treatments included amino acids, Aminabon 50 (0.5 and 0.1 g L-1), seaweed (0.25 and 0.5 g L-1), micronutrients (0.1 and 1.5 g L-1), and four combined treatments obtained from different concentrations of amino acids, seaweed, and micronutrients. Spraying with distilled water served as the control treatment. The results showed that the treatments had a significant effect on all studied traits. The highest content of copper was observed in response to amino acid + micronutrients (1.63 mg kg-1). The effects of amino acid + seaweed + micronutrients on the other traits were observed in the highest statistical class. In general, the latter combined treatment was the most efficient with the lowest content of soluble tannin (26.46 mg g-1) compared to the control (32.12 mg g-1) and to the other treatments.
Abdolkarim Ejraei; Ahmad Mohammadi Ghehsareh; Mehran Hodaji; Ali Asghar Besalatpor
Abstract
Several methods have been proposed for recommendation of phosphorus fertilizers. Each of them only examines the concentration of phosphorus in the soil or plant, while none of them investigates the correlation between phosphorus concentrations in the soil and plant. In this study, a method called "integrated ...
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Several methods have been proposed for recommendation of phosphorus fertilizers. Each of them only examines the concentration of phosphorus in the soil or plant, while none of them investigates the correlation between phosphorus concentrations in the soil and plant. In this study, a method called "integrated plant and soil system" (IPSS) is proposed to describe phosphorus fertilizer. In this system, for recommendation of phosphorus, the correlation between this element in soil and plant was used. For this purpose, 39 Washington Navel Orange orchards were selected in Jahrom region and from each orchard three trees were chosen. Samples were taken from soil and plants during two consecutive years and their phosphorus was measured. Orchards were divided into two categories, first group high-yield orchards and another includes all orchards. The correlation was run between soil properties and phosphorus of plant organs with the phosphorus of soil saturation extract samples. Factors were selected that shown significant correlation with the phosphorus of soil saturated extract, and multivariate regression was established between them. The results showed a significant correlation between phosphorus of plant organs and soil samples, and the highest correlation was observed between fruit phosphorus and phosphorus of soil saturation extract. Moreover, there was a significant correlation between phosphorus of plant organs, and the highest correlation was observed between fruit phosphorus with other plant organs. A equation was also obtained for each of the two orchard groups, these two equations can calculate the amount of phosphorus required for orange orchards.
