Plant Productions

Evaluation of the Interactive Effects of Nitrogen Sources and Sodium Bicarbonate on The Growth and Some Morpho-Physiological Characteristics of Garlic in Hydroponic System

Mahdiyeh Shojaei Khanisi; Hamid Reza Roosta; Mahmoudreza Roozban; Hamidreza Soufi

Volume 44, Issue 2 , August 2021, , Pages 221-234

https://doi.org/10.22055/ppd.2020.31011.1821

Abstract

AbstractIntroductionSoil salinity and alkalinity seriously affect about 932 million hectares of land globally, reducing productivity in about 100 million hectares in Asia. Plants in ... Read More AbstractIntroductionSoil salinity and alkalinity seriously affect about 932 million hectares of land globally, reducing productivity in about 100 million hectares in Asia. Plants in alkaline soil must cope with physiological drought and ion toxicity, and also maintain intracellular ion balance and regulate pH outside the roots. Alkaline stress result into decrease in chlorophyll concentration, stomatal conductance and transpiration rate and inhibite the growth of plant. Nitrogen sources affect the pH of nutrition solution, which can affect plant growth, so nitrate increases the pH of nutrient solution while ammonium decreases pH of nutrition solution. Materials and MethodsIn order to evaluate the effect of nitrogen sources on vegetative growth, physiological and chlorophyll fluorescence of white and purple garlic genotypes under sodium bicarbonate stress, an experiment was carried out as factorial base on completely randomize desigen with three factors; sodium bicarbonate at three levels (0, 10 and 20 mM), nitrogen sources (5 mM ammonium sulfate, ammonium nitrate and calcium nitrate in nutrient soulotion) and genotypes (white and purple) with three replications in 2017 in Greenhouse of Faculty of a Agriculture, University of Vali-e-asr Rafsanjan. Results and DiscussionThe results showed that shoot and root fresh and dry weight decreased by increasing sodium bicarbonate from 10 mM to 20 mM in nutrient solution and application of ammonium nitrate and ammonium sulfate sources decreased the negative effect of sodium bicarbonate on shoot and root fresh and dry weights. Among nitrogen sources, ammonium sulfate produced the highest soluble sugar content in both garlic genotypes. Proline content was enhanced by increasing sodium bicarbonate concentration in nutrient solution. The highest photosynthetic pigments were absorbed in plant that nourished by ammonium nitrate and ammonium sulfate, respectively. The sources of nitrogen, sodium bicarbonate and their interaction had no significant effect on chlorophyll fluorescence parameters, but genotype had significant effect on these traits. ConclusionAccording to the results of this experiment, the use of ammonium sulfate and ammonium nitrate sources has a better performance on growth and yield of garlic under bicarbonate stress conditions.

Effect of Nano-Silicon and Imidacloprid Foliar Application on Morpho-Physiological Characteristics of Gerbera Cut Flower and Its Reaction to Whitefly under Greenhouse Conditions

Parisa Ranjbar; Mohammad Javad Nazarideljou; Abbas Hoseinzadeh

Volume 43, Issue 2 , September 2020, , Pages 295-308

https://doi.org/10.22055/ppd.2019.27344.1662

Abstract

Abstract Background and ObjectivesGerbera (Gerbera jamesonii Bolus ex. Hook f.) is known as the world's fourth cut flower and silicon (Si) is considered the second most abundant ... Read More Abstract Background and ObjectivesGerbera (Gerbera jamesonii Bolus ex. Hook f.) is known as the world's fourth cut flower and silicon (Si) is considered the second most abundant element (28%) of the Earth's crust.Silicon deposition in most tissues and organs, such as plant cell wall, the space between the cells of the epidermis, roots, leaves, and reproductive organs causes resistance to environmental stresses, insects, and pathogens into the plant. Greenhouse whiteflies (Trialeurodes vaporariorum) are the most important pests in several crops such as gerbera, which have herbivorous insects with piercing-sucking mouthparts and have 4 to 15 in their generation. Materials and MethodsConsidering the numerous environmental risks posed by using pesticides in pest control especially under greenhouse conditions,this study was conducted to compare whiteflies control with imidacloprid pesticide and nano-silicon fertilizer (NSF) as a quasi-essential element in plant nutrition and their impacts on improving resistance to pest. This research was designed as a pot experiment in a soilless greenhouse with polyethylene (PE) coated and controlled environmental conditions. Flower quality components, including flower diameter, flowering stem height and vase life, relative water content (RWC), vase solution uptake, the total phenol content,leaf Ca++ and Si+ content and whiteflies contamination (egg, nymph, pupa, and adult) were evaluated using a factorial experiment based on completely randomized design with three replications in a hydroponic greenhouse. ResultsThe results showed that NSF caused a significant increase of flower diameter, stem length and vase life of flower compared to imidacloprid. Also, NSF increased total phenol content. Leaf calcium and Si concentration in treatment with NSF showed a significant increase compared to other treatments.In addition, the percentage of whitefly population significantly decreased under applying NSF and imidacloprid compared to the control plants. Spraying imidacloprid despite whitefly control led to the reduction of flower diameter and total phenol content. Also, imidacloprid significantly increased flowering stalk height and the contamination of whitefly nymph with respect to NSF. DiscussionAccording to the results of the present research, foliar application of NSF not only reduced the environmental impact caused by using chemical pesticides but also led to the control of whiteflies population and improved the quality of gerbera cut flower. Therefore, we recommend the use of NSF as a fertilizer-medicine in greenhouse cultivation of gerbera 'Stanza'.

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Keywords = Soilless culture

Evaluation of the Interactive Effects of Nitrogen Sources and Sodium Bicarbonate on The Growth and Some Morpho-Physiological Characteristics of Garlic in Hydroponic System

Abstract

Effect of Nano-Silicon and Imidacloprid Foliar Application on Morpho-Physiological Characteristics of Gerbera Cut Flower and Its Reaction to Whitefly under Greenhouse Conditions

Abstract