Plant Productions

The effect of different culture media and aerial root pruning on the growth of Papaya (Carica papaya)

mohammad kazemi; Elham Danaee

Volume 46, Issue 4 , March 2024, , Pages 611-623

https://doi.org/10.22055/ppd.2024.44549.2118

Abstract

Introduction Papaya (Carica papaya) is a tropical tree that leaves, fruits, seeds and roots has many medicinal and edible uses. Choosing the appropriate planting medium is one of the ... Read More Introduction Papaya (Carica papaya) is a tropical tree that leaves, fruits, seeds and roots has many medicinal and edible uses. Choosing the appropriate planting medium is one of the important ways to improve seedling growth of fruit trees. By improving the physical and chemical properties, it causes better absorption of nutrients and improves plant growth. Also, aerial root pruning to produce seedlings with branched and strong root systems is one of the effective factors in growing plants. Materials and methods To study the effect of different culture media and aerial root pruning on the growth of Papaya (Carica papaya), an experiment was conducted in the form of a completely randomized statistical design with three replications and two factors of planting media (cocopeat 100%, peat mass 100%, and cocopeat 70% + perlite 30%, peat moss 70% + perlite 30%) and performing or not performing aerial root pruning was implemented in the greenhouse. The seeds were sown in the culture trays containing the desired planting beds, and horizontal cuts were made in the walls of the culture tray cavities to perform aerial pruning of the roots in the desired treatments. Sampling was done 50 days after sowing the seeds and some morphologic, physiologic and biochemical traits include fresh and dry weight of seedlings, root length, seedling height, internode length, node number, leaf area, total chlorophyll, peroxidase, catalase and superoxide dismutase activity were analyzed. Results and Discussion The results showed that the treatments had a significant effect on the assessed traits so that the highest fresh and dry weight of seedlings (1.69, 0.66 g, respectively), root length (17.66 cm), seedling height (7.92 cm), internode length (8.61 mm) and node number (4.67) were observed in 70% peat moss + 30% perlite and no aerial root pruning. The maximum leaf area (9.14 cm3) and total chlorophyll (1.69 mg g-1 FW) content were obtained in the 100% peat moss planting bed treatment and no aerial root pruning and the 70% peat moss + 30% perlite treatment and root aerial pruning. The highest activity of peroxidase (37.60 U enzyme-1 FW), catalase (7.60 U enzyme-1 FW) and superoxide dismutase (16.08 U enzyme-1 FW) enzymes was also in 100% peat moss treatment and root aerial pruning. Conclusion In general, the results of this research showed that the combination of two organic and inorganic substrates, peat mass 70% and perlite 30%, showed the best effect on vegetative characteristics and total chlorophyll content in papaya. Also, the highest activity of peroxidase, catalase and superoxide dismutase enzymes was observed in 100% peat moss bed. Root aerial pruning also decreased the evaluated growth characteristics and increased the total chlorophyll content and activity of peroxidase, catalase and superoxide dismutase enzymes. According to the results, different culture media had different physical and chemical characteristics that can affect plant growth. In this research it is recommended to sowing papaya seeds in 70% peat moss and 30% perlite and not to perform aerial root pruning to produce this product.

Effect of different growing media on morpho-physiological, biochemical and nutrient uptake characteristics of Amaryllis (Hippeastrum spp.) under vegetative growth period

Mohammad Ali khalaj; Mohammad Hossein Azimi; anousheh yousefbeigi

Volume 45, Issue 4 , February 2023, , Pages 519-531

Abstract

Introduction Ideal plant cultivation substrates have become the first and most important prerequisite for the successful cultivation of any plant. One of the appropriate methods to ... Read More Introduction Ideal plant cultivation substrates have become the first and most important prerequisite for the successful cultivation of any plant. One of the appropriate methods to achieve optimal performance and produce flowers with marketable quantity and quality is to use mineral and organic substrates as a substrate for growing ornamental plants. Today, in soilless cultivation systems, various inorganic and organic cultivation substrates are used worldwide. Not only good physical, chemical, and biological properties are important for a substrate, but a suitable culture medium must be available, relatively cheap, stable, and economically viable. Ornamental plant production worldwide has changed dramatically in the last 20 years. There are various reasons, including cheap labor and other initial costs, production has moved to new countries in Africa, Asia, and South America. Ornamental bulbous plants are herbaceous species that are morphologically characterized by regeneration structures located in underground storage organs, such as rhizomes, tubers, and bulbs. Amaryllis has a terminal inflorescence. The flowers are large and the colors vary with species, hybrids and varieties, but it varies from dark red to white, green and orange to mixtures. Amaryllis is produced commercially as cut flowers, pot plants, or propagation material (bulb), as well as gardening and landscaping. It produced as pot plant in Iran. Quality and quantity yield improvement of ornamental plants such as amaryllis is affected by genetic and environmental factors. Growing media is an agronomic factor. One of the important requirements in the production of horticultural products to achieve high yield and good quality, especially in the case of ornamental plants, is the plant cultivation media. Materials and Methods The growth of amaryllis (Hippeastrum spp.) was evaluated using different pot mixtures (v: v). This study was conducted as a completely randomized design with three replications in the Ornamental Plants Research Center (OPRC) in 2019-2020 on amaryllis. In this experiment, the applied treatments were included the type of substrate at 13 different levels,1) 80% perlite + 20% coco-peat,2) 60% perlite + 40% coco peat,3) 40% perlite + 60% coco peat,4) 20% perlite + 80% coco peat,5) 80% perlite + 20% peat moss,6) 60% perlite + 40% peat moss,7) 40% perlite + 60% peat moss,8) 20% perlite + 80% peat moss,9) 25% fine-grained perlite + 75% mixed perlite,10) 50% fine-grained perlite + 50% mixed perlite,11) 75% fine-grained perlite + 25% mixed perlite,12) 100% fine-grained perlite and 13) 100% mixed perlite. At the end of the experiment, Plant growth was measured by different parameters such as fresh and dry weight of shoots and root, leaf length and width, number of leaves, bulbs diameter, number of bulbs as well as nutrients uptake in the plant shoot were measured. Results and Discussion The results of variance analysis showed that there is a significant difference among substrates. It seems that the medium of 80% perlite with 20% cocopeat or 20% peat improves plant growth by absorbing more nitrogen, phosphorus and potassium nutrients. Therefore, the morphological characteristics of Amaryllis (Hippeastrum spp.) were also improved. Conclusion Our findings indicate the relationship among media and improving the quantitative and qualitative characteristics of amaryllis (Hippeastrum spp.), which has been reported in other studies as well.

The Effect of Different Concentrations of IBA, NAA and Their Interactions on the Rooting of Semi-Hardwood Cuttings of Kiwifruit (Actinidia deliciosa CV. Hayward)

M R; V R; SH S

Volume 33, Issue 1 , September 2010, , Pages 87-96

Abstract

This research was to evaluate the effect of different concentrations of Indole -3- butyric acid (IBA) “0, 2000, 4000, 6000 mg.l-1”, 1-naphtalene acetic acid (NAA) “0, ... Read More

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Keywords = Perlite

The effect of different culture media and aerial root pruning on the growth of Papaya (Carica papaya)

Abstract

Effect of different growing media on morpho-physiological, biochemical and nutrient uptake characteristics of Amaryllis (Hippeastrum spp.) under vegetative growth period

Abstract

The Effect of Different Concentrations of IBA, NAA and Their Interactions on the Rooting of Semi-Hardwood Cuttings of Kiwifruit (Actinidia deliciosa CV. Hayward)

Abstract