scholarly journals Effect of slow release fertilizers on container-grown woody plants

2008 ◽  
Vol 34 (No. 1) ◽  
pp. 35-41 ◽  
Author(s):  
F. Šrámek ◽  
M. Dubský
Keyword(s):  
Nitrogen Fertilizer ◽  
Woody Plants ◽  
Slow Release ◽  
First Year ◽  
Nutrient Source ◽  
Thuja Occidentalis ◽  
Slow Release Fertilizers ◽  
Second Year ◽  
Soluble Fertilizer ◽  
Pyracantha Coccinea

Slow-Release Fertilizers (SRF) Silvamix Forte and Silvagen were tested in two-year experiments with container-grown woody plants (<i>Pyracantha coccinea</i>, <i>Thuja occidentalis</i>). Several fertilizing systems were compared: preplant application of SRF into substrate as the sole nutrient source for a two-year period, preplant application of SRF and soluble fertilizer (PG Mix), and preplant application of SRF and soluble fertilizer together with additional fertilizing by solution of nitrogen fertilizer during both growing periods. A system with controlled-release fertilizer (CRF) Osmocote 5&minus;6 was chosen as a control variant; it was incorporated into substrate before planting in the first year and top-dressed in the second year. CRF Plantacote 6M (mixed into substrate before planting and top-dressed in the second year) and Osmocote 16&minus;18 applied only before planting were tested, too. The experiments showed that SRF Silvamix Forte and Silvagen give results comparable with CFR provided that they were incorporated together with soluble ferti-lizer dose and plants were fertilized by solution of nitrogen fertilizer during both growing periods.

Effect of tillage on nitrogen response in corn (Zea mays L.) after established alfalfa (Medicago sativa L.)

1993 ◽  
Vol 73 (1) ◽  
pp. 73-81 ◽  
Author(s):  
G. K. S. Aflakpui ◽  
T. J. Vyn ◽  
M. R. Hall ◽  
G. W. Anderson ◽  
C. J. Swanton
Keyword(s):  
Nitrogen Fertilizer ◽  
Nitrogen Availability ◽  
Conventional Tillage ◽  
Growth And Yield ◽  
First Year ◽  
Tillage Systems ◽  
Nitrogen Rate ◽  
Nitrogen Response ◽  
No Till ◽  
Second Year

The effect of tillage and added nitrogen fertilizer on first- and second-year corn after an established alfalfa stand was investigated in field studies near Woodstock, Ontario, Five rates of nitrogen fertilizer, ranging from 0 to 160 kg ha−1, were evaluated to determine their influence on corn growth and yield in both no-till and conventional tillage systems in the first and second years of corn following alfalfa. In the first year of corn after alfalfa, grain yield and harvest index were significantly lower with no-till than with conventional tillage only in 1988. First-year grain yields were independent of nitrogen fertilizer rates in both 1988 and 1989. There was no tillage by nitrogen rate interaction in either year indicating that additional nitrogen fertilizer was not required to achieve optimum corn yields with no-till relative to conventional tillage. Yields of second-year corn increased with nitrogen rate in both 1989 and 1990. Tillage systems had no apparent influence on nitrogen availability to corn grown after an established alfalfa stand. Key words: Tillage, alfalfa, nitrogen

scholarly journals Comparison of phosphate fertilisers in a grazed hill country pasture

1990 ◽  
pp. 97-100 ◽  
Author(s):  
A.D. Mackay
Keyword(s):  
Phosphate Rock ◽  
Slow Release ◽  
First Year ◽  
Pasture Production ◽  
Hill Country ◽  
Grazed Pasture ◽  
Reactive Phosphate Rock ◽  
Small Plot ◽  
Second Year

A grazing trial evaluated the agronomic effectiveness of 3 different types of phosphate (P) fertilisers. The same fertilisers were also evaluated in a small-plot mowing trial located within the grazing trial. In the grazing trial, which covered 35 ha of summer moist hill country, the partially acidulated phosphate rock (PAPR) and reactive phosphate rock (RPR) were as effective as superphosphate in stimulating legume and pasture production in the first year. In the second year the two slow-release materials continued to perform as well as SSP. In contrast in the mowing trial, superphosphate was more effective than RPR in the first year. This trial technique clearly underestimates the initial effectiveness of PAPR and RPR in grazed hill country. The traditional small-plot mowing trial technique, and the role of PAPR and RPR fertilisers in hill country, both need re-evaluation. Keywords hill country, superphosphate, slow release fertilisers, mowing trials, grazed pasture

scholarly journals Effect of different fertilization on the growth and nutrition of azalea (Rhododendron L.)

2012 ◽  
Vol 65 (4) ◽  
pp. 123-132 ◽  
Author(s):  
Zenia Michałojć ◽  
Michał Koter
Keyword(s):  
Slow Release ◽  
Nutrient Content ◽  
Magnesium Content ◽  
Shoot Length ◽  
First Year ◽  
Fertilizer Rate ◽  
Slow Release Fertilizer ◽  
Growth And Nutrition ◽  
Growing Medium ◽  
Second Year

A study on azalea (<em>Rhododendron </em>L.), 'Kilian' and 'Persil', was conducted in 2009–2010. Plants were grown in pots in the open air, in a peat substrate with a pH of 4.8. The effect of the following fertilization methods was studied: I – traditional fertilization (single fertilizers were applied in 2 rates); II – a slow-release fertilizer (Hortiform pH); III – combined fertilization (¼ of the rate of nutrients was applied in the form of single fertilizers and ¾ in the form of Hortiform pH). The slow-release fertilizer Hortiform pH and combined fertilization were applied once in each study year when filling the pots with growing medium. Fertilizers were applied at the basic rate (D1) and at a twice higher rate (D2). In the first year of cultivation, the study showed no significant effect of fertilization method on shoot length in both azalea cultivars, whereas in the second year the longest shoots were found after application of the slow-release fertilizer Hortiform pH. In both years of the study, significantly longer shoots were found in the cultivar 'Persil' after application of the lower fertilizer rate (D1) than after application of the higher fertilizer rate (D2). On the other hand, the study showed that the fertilizer rate had no effect on shoot length in 'Kilian'. After application of the higher fertilizer rate, a higher content of nitrogen and potassium as well as a lower content of phosphorus, calcium, and magnesium were determined in the leaves of both cultivars. The study found the following percentages to be the optimal nutrient content in azalea leaves: 1.88 – 2.20% N; 1.0 – 1.7% K; and 0.60% – 1.20% Ca, while the phosphorus content of 0.09 – 0.25% and the magnesium content of 0.14 – 0.25% were shown to be the lower limit for optimal plant nutrition. After the end of the growing season, a low content of all nutrients in the medium was found in both study years, irrespective of the applied fertilizer rate and fertilization method.

scholarly journals Influence of fertilization application and growing substrate on container-grown woody ornamentals

2011 ◽  
Vol 48 (No. 10) ◽  
pp. 448-457
Author(s):  
F. Šrámek ◽  
M. Dubský
Keyword(s):  
Controlled Release ◽  
Woody Plant ◽  
Slow Release ◽  
Thuja Occidentalis ◽  
Woody Ornamentals ◽  
Slow Release Fertilizer ◽  
Liquid Feeding ◽  
Wood Fibres ◽  
Pyracantha Coccinea ◽  
Additional Nitrogen

Five fertilization systems and seven types of growing substrates were tested with two woody plant species with different nutritional demands (Thuja occidentalis, Pyracantha coccinea) grown in two-litre containers. The experiment was repeated in two vegetative seasons. Application of controlled release fertilizer (CRF) was proved the most reliable; it gave good or at least average results in dependence on used growing substrates. Significant differences between application of CRF and other fertilization systems were with Pyracantha plants. System using slow release fertilizer with additional nitrogen fertilizing also showed good results. Systems based only on liquid feeding were less reliable, with some substrates they showed very good results; with others (peat substrate, peat bark substrates with wood components) they were bad. Similar results were achieved with top dressing of granulated fertilizer. Evaluating the substrates good results were obtained by using mixtures of peat with components with higher content of nutrients &ndash; peat bark substrates, peat bark substrates with compost and non-peat mixtures of composted bark, wood fibres and compost. Significant differences between these types of substrates and peat one or peat bark substrate with wood components were both with Thuja plants and especially with Pyracantha plants, which have higher demand for nutrients. The experiments showed that peat based substrates amended with alternative components or non-peat substrates can bring better results than the peat ones.

scholarly journals Influence of Water-soluble and Slow-release Fertilizers on Growth of Pot Carnation in C-Channel Mat Irrigation System

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 770A-770
Author(s):  
Chun Ho Pak* ◽  
Seung Won Kang ◽  
Chiwon W. Lee
Keyword(s):  
Growth Rate ◽  
Slow Release ◽  
Irrigation System ◽  
Dianthus Caryophyllus ◽  
Water Soluble ◽  
Influence Of Water ◽  
Slow Release Fertilizers ◽  
Soluble Fertilizer ◽  
Number Of Branches

The influence of water-soluble fertilizer (WSF, 3 different formulations) and slow-release fertilizer (SRF, Osmocote, 14N-6.2P-11.6K) on the growth and quality of potted carnation (Dianthus caryophyllus cv. Invitation) in a C-channel mat irrigation system was investigated. When fertilized with 0.4, 0.8, or 2.0 g·L-1 of WSF (20N-7.9P-16.6K for weeks 1-4, 13K-0.1P-18.8K for weeks 5-11, and 15N-0P-12.5K for weeks 12-15), the 0.8 g·L-1 solution produced the highest quality plants as determined by total shoot fresh and dry weights, leaf area and number, plant height, and number of branches per pot. The quality of plants grown with 0.4 g·L-1 or 2.0 g·L-1 WSF solution was also commercially acceptable. The growth rate of all plants began to accelerate at around 60 days after treatment started, with some variation with the fertilizer treatments. Plants began to show a reduced growth rate at around 90 days from the treatment when they underwent a phase change from vegetative growth to reproductive growth. Plants grown with SRF alone were less vigorous than those grown with WSF, especially when temperature was lower. Results of this study indicate that high quality pot carnations can be produced, using a reduced amount of fertilizer applied to the C-channel mat irrigation system.

Preparation and Properties of Urea Slow-Release Fertilizer Hydrogel by Sodium Alginate-Gelatin Biopolymer

2021 ◽  
Vol 889 ◽  
pp. 98-103
Author(s):  
Wilawan Hnoosong ◽  
Pornpairin Rungcharoenthong ◽  
Suntree Sangjan
Keyword(s):  
Nitrogen Fertilizer ◽  
Slow Release ◽  
Release Kinetics ◽  
Release Kinetic ◽  
Order Kinetic ◽  
High Solubility ◽  
Kinetic Rate ◽  
Kinetic Rates ◽  
Slow Release Fertilizers ◽  
The Way

Urea is high solubility nitrogen fertilizer. There is major nitrogen pollution in ecosystem. Slow-release nitrogen fertilizer the way to decrease nitrogen form agriculture. Slow-release nitrogen fertilizer the way to decrease nitrogen in agriculture. Slow-release formulations of nitrogen fertilizer were developed based on alginate-gelatin by using calcium chloride as the cross-linker in the egg-box model as hydrogels. Water-retaining ratio, loading behavior, and the release kinetics were examined. The release kinetic rates were investigated by Zero-order kinetic, First-order kinetic, Higuchi, Korsmeyer-Peppas, Weibull, and Hixson-Crowell models. The results showed that the S1G0.5 sample (alginate 1 g and gelatin 0.5 g) was the optimum condition for application as urea slow-release fertilizers because it was a minimal release kinetic rate for 12 hrs. These results indicate that the alginate-gelatin hydrogel can be a slow-release nutrient to plant an environmentally friendly fertilizer.

Slow-release nitrogen fertilizer in carrot production on Prince Edward Island

2012 ◽  
Vol 92 (6) ◽  
pp. 1223-1228 ◽  
Author(s):  
K. R. Sanderson ◽  
S. A. E. Fillmore
Keyword(s):  
Nitrogen Fertilizer ◽  
Prince Edward Island ◽  
Assessment Tool ◽  
Slow Release ◽  
Urea Formaldehyde ◽  
Marketable Yield ◽  
Slow Release Fertilizer ◽  
Industry Standard ◽  
Slow Release Fertilizers ◽  
The Impact

Sanderson, K. R. and Fillmore, S. A. E. 2012. Slow-release nitrogen fertilizer in carrot production on Prince Edward Island. Can. J. Plant Sci. 92: 1223–1228. The impact of nitrogen management using slow-release fertilizers has not been examined for carrot (Daucus carota L.) production in Atlantic Canada. To assess the effects of such products, we evaluated five slow-release fertilizers over a 3-yr period. Treatments consisted of sulphur coated urea (SCU) (42–0–0), isobutylidene diurea (IBDU) (31–0–0), Nutralene® (methylene urea) (40–0–0), Sirflor® (urea formaldehyde) (38–0–0), UFLEXX™ (urea, dicyandiamide, N-(n-butyl) thiophosphoric triamide) (46–0–0) compared with industry standard (ammonium nitrate) (34–0–0). All slow-release fertilizer treatments supplied N at 50 kg N ha–1 pre-plant. Slow-release fertilizer treatments were compared with the industry standard of 50 kg N ha−1 pre-plant plus 50 kg N ha–1 as a top dress. UFLEXX™ increased biological and marketable yield by 7.5 and 18.7%, respectively, compared with the industry standard. Sirflor® produced the lowest yield. GreenSeeker® NDVI reading and LECO N were correlated at the mid-season sample. GreenSeeker® technology has potential as an in-field crop health assessment tool, however, further research is required to develop GreenSeeker® algorithms appropriate for carrot production in Prince Edward Island.

scholarly journals EVALUATION OF SLOW RELEASE FERTILIZER ON THE INITIAL DEVELOPMENT AND COFFEE PRODUCTION

2019 ◽  
Vol 14 (4) ◽  
pp. 538
Author(s):  
Kleso Silva Franco Junior ◽  
Julian Silva Carvalho ◽  
Bernardino Cangussu Guimarães ◽  
Camila Karen Reis Barbosa ◽  
Giselle Prado Brigante ◽  
...  
Keyword(s):  
Shoot Growth ◽  
Slow Release ◽  
Block Design ◽  
First Year ◽  
Coffee Production ◽  
Fresh Matter ◽  
Initial Development ◽  
Slow Release Fertilizer ◽  
Randomized Block Design ◽  
Second Year

The objective in this work was to evaluate the efficiency of slow release fertilizer in seedling production, initial development and first coffee production. The research was carried out at Sitio Santa Felicidade, Campestre - MG, Brazil, in a randomized block design with two treatments and ten replicates, totaling 20 experimental plots. Coffee seedlings were produced using Ciclus Substrate (20% N, 22% P2O5 and 5% K2O) and conventional fertilizers 4 kg simple super phosphate (18% P2O5) and 0.25 kg Potassium Chloride (58% K2O). The variables evaluated were size, dry and fresh matter of the shoot and root system, and the seedlings were transplanted to the field and those from Ciclus Substrate received in the first year Ciclus NS (30% N) and in the second year. NK (19-00-19) and conventionally produced with conventional fertilizers (20-00-20 and 25-00-25 respectively), the variables evaluated were: shoot growth, length and number of plagiotropic branch internodes Slow release fertilizer ciclus Substrate has been found to be a viable technology for the production of arabica coffee seedlings, coffee planting NS provides good plant development and coffee producing NK provides good plant growth and higher productivity.

Can advance of first lambing induced by melatonin implants influence the next lambing time in Sarda breed sheep?

2012 ◽  
Vol 92 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Vincenzo Carcangiu ◽  
Maria Consuelo Mura ◽  
Pier Paolo Bini ◽  
Giuseppe Massimo Vacca ◽  
Cinzia Daga ◽  
...  
Keyword(s):  
Breeding Season ◽  
Slow Release ◽  
Reproductive Activity ◽  
First Year ◽  
Melatonin Treatment ◽  
Ewe Lambs ◽  
Second Year ◽  
Single Implant ◽  
Breed Sheep ◽  
Short Days

Carcangiu, V., Mura, M. C., Bini, P. P., Vacca, G. M., Daga, C. and Luridiana, S. 2012. Can advance of first lambing induced by melatonin implants influence the next lambing time in Sarda breed sheep? Can. J. Anim. Sci. 92: 67–71. In adult sheep, exogenously administered melatonin from continuous slow-release implants has been shown to advance the onset of the breeding season by mimicking the stimulatory effect of short days. The aim of this study was to verify if treatment with one or two melatonin implants was effective in advancing the first conception in Sarda ewe lambs, and if this advance would also be seen in the second lambing too. In the first year, 600 ewe lambs were randomly assigned to groups M, M+M and C, each with 200 animals. On Jun. 30, group M received a single implant while group M+M received two implants. Group C was untreated. On Aug. 04, 25 rams were introduced in the groups and removed after 70 d. From these 600 animals the 420 head that lambed prior to Mar. 12 were chosen for the second year. These ewes were subdivided into two groups T1 (ewes who lambed between 2007 Jan. 01 and Feb. 10) and T2 (ewes which lambed between 2007 Feb. 11 and Mar. 12). Both in T1 and T2 the distribution of the animals in M, M+M and C group was maintained. In the first year, the treated animals lambed earlier (P<0.05) and showed higher numbers of lambed ewes at Feb. 10 (P<0.01) and at March 12 (P<0.05) compared with untreated control animals. The animals that showed an advance in the period of their first conception, also showed, in the second breeding year, an advance in the lambing time (P<0.001). This study provides evidence that the advance of first conception, obtained with melatonin treatment also influenced the reproductive activity in the following breeding season.

scholarly journals Effects of 2 Slow-Release Fertilizers on the Propagation and Subsequent Growth of 3 Woody Plants

1983 ◽  
Vol 1 (3) ◽  
pp. 55-58 ◽  
Author(s):  
Michael Carney ◽  
Carl E. Whitcomb
Keyword(s):  
Woody Plants ◽  
Slow Release ◽  
Growth Parameters ◽  
Growing Season ◽  
Subsequent Growth ◽  
Slow Release Fertilizer ◽  
Factorial Combination ◽  
Slow Release Fertilizers ◽  
Rooting Of Cuttings ◽  
Four Levels

Three woody plants were propagated from cuttings with four levels each of slow-release 27 N-5.2P-0.OK (27-12-0) and 0N-0P-38.2K (0-0-46) fertilizer in factorial combination. Slow-release fertilizer added during propagation had little effect on rooting of cuttings, however, after rooting and before transplanting into larger containers in the spring, the 27-12-0 stimulated both root and top growth of all species. All growth parameters measured for all species grown in 3.8 1 (#1) containers were significantly increased after one growing season when treated with a combination of slow-release N and P during propagation or following transplanting.

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