Growth effects of the application of new controlled-release fertilizers on Phalaenopsis spp.

Abstract

To develop a controlled-release fertilizer (CRF) suitable for nutrient absorption characteristics of Phalaenopsis, four kinds of new controlled-release fertilizer (NCRF 1-4) with different dissolution rates were developed and studied to determine the concentration and amount suitable for growth of Phalaenopsis. To make NCRF, new acryl-based polymers were developed and used as fertilizer coating solutions. In addition, a fluidized bed coater for coating fertilizer was developed and used in this study. To test the growth of Phalaenopsis, 10-monthold Phalaenopsis seedlings were planted in plastic pots (diameter 10 cm) filled with 100% Sphagnum moss and cultivated for approximately 100 days from May 29, 2015, to September 11, 2015. NCRF 1, NCRF 2, and Osmocote, an imported fertilizer, consistently exhibited release patterns of fertilizer nutrients in a directly proportional form; however, NCRF 3 and NCRF 4 displayed a sigmoid-like tendency of fertilizer nutrient release with a slower initial dissolution rate. Furthermore, leaf length, leaf width, fresh weigh, and root weight of Phalaenopsis were the highest when growing in 1.5 g/pot of NCRF 3 fertilizer, and the pH and electrical conductivity (EC) of the soil were stable at this concentration of NCRF 3. Based on our results, we suggest that 1.5 g/pot of NCRF 3 fertilizer is the ideal concentration and fertilizer for growing Phalaenopsis.

Effects of Controlled - Release Potash Fertilizer on Growth and Yield of Cucumber in Thai Nguyen

“…Number of branches, number of male flowers in all fertilization formula was not significantly different. CT4 with a low dose of potassium resulted in poor plant growth and development, this figure is suitable with the previous studies [2], [6].…”

“…Utilizing controlled-release fertilizers is an effective solution to reduce nutrient loss and improve crop yield and quality [5]. The potential of using controlled-release fertilizers in agricultural production is huge [6] - [9], however, the application of controlled-release fertilizers in Vietnam is not popular, especially polymer-coated controlled-release fertilizers, which have capacity of controlling speed of nutrient release through polymer shells [10] - [12].…”

Biodegradable Enhanced Efficiency Fertilizer Based on Biopolymers/Zeolites Films’ Assembly

“…According to the literature, the release curves can be classified as linear and sigmoidal . The linear type indicates that the rate of nutrient release is continuous over time . In the sigmoidal curve, nutrients are released slowly at first and, after a certain period, are released more quickly .…”

“…37 The linear type indicates that the rate of nutrient release is continuous over time. 38 In the sigmoidal curve, nutrients are released slowly at first and, after a certain period, are released more quickly. 38 The literature establishes that EEFs that present sigmoidal release curves are ideal, since the absorption of nutrients by plants also occurs in the sigmoid form, with no waste of fertilizers.…”

Strategies of fertilizer application for ornamental pineapple plants grown in pots under anti-aphid screen

“…This practice combined with excessive sprinkler irrigations has increased leaching and decreased the quality of these plants for marketing. Techniques that consider reductions in nutrient losses by leaching, such as drip irrigation (Carr, 2012;Wolff et al, 2017;Lv et al, 2019), split application of soil fertilizers (Kumar et al, 2016;Brezolin et al, 2017), and use of slow-release fertilizers (Ha et al, 2018;Li et al, 2019) can be alternatives to improve the nutritional management of ornamental pineapple plants.…”