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Blue Ink: A Literary Arts Journal 2025 - 2026
No full texthttps://digitalscholarship.tnstate.edu/blueink/1001/thumbnail.jp
Impact of Nitrogen Fertilizer Application Rates on Plant Growth and Yield of Organic Kale and Swiss Chard in Vertical Farming System
No full textTo support the growing global population, sustainable farming methods like vertical farming must complement traditional agriculture. This study evaluated the effects of various nitrogen fertilizer application rates (N_low (1055.3 ppm), N_rec (1640.9 ppm), N_high (2811.3 ppm), and N_0 (469.9 ppm)) on organic kale (Brassica oleracea L. var. acephala ‘Lacinato’) and Swiss chard (Beta vulgaris subsp. Vulgaris ‘Ruby/Rhubarb Red’), grown in a vertical growing system installed in a high tunnel during the spring and fall season of 2023 at the organic farm of Tennessee State University. Growth parameters studied included fresh weight, Brix, chlorophyll, plant height, and leaf count. Most parameters did not exhibit statistically significant differences (alpha = 0.05). However, consistent numerical trends and deviations were observed. Although not statistically significant, kale achieved the highest mean fresh weight in N_rec (688.08 g), and Swiss chard in N_high by spring (649.62 g). Among the few parameters, significant differences were observed for Swiss chard plant height (48.07 cm) and leaf count (47.25), with N_high during fall. Findings suggest that while definitive conclusions were limited, recommended nitrogen rates (N_rec) may enhance crop performance and contribute sustainable yields in resource constrained vertical farming systems. Further controlled studies are warranted to validate trends and refine nutrient strategies in vertical growing system
Organic Glycinate Trace Minerals Improve Hatchability, Bone and Eggshell Breaking Strength, and Mineral Uptake During Late Laying Cycle in Layer Breeders
Full text linkThis study evaluated the effects of replacing inorganic trace minerals with organic glycinate forms at two inclusion levels in layer breeders during the late laying cycle over 6 weeks (66 to 72 weeks of age). For this, a total of 180 layer breeders (162 hens and 18 males; Lohmann LSL Ultralite) were randomly divided into three treatment groups having six replicates of nine hens each and one male for each replicate following a completely randomized design (CRD). The dietary treatments included: (1) Basal diet + inorganic trace minerals at breed recommended levels (ITM100), (2) Basal diet + organic trace minerals at recommended levels (OTM100), (3) Basal diet + organic trace minerals at half dose of recommended levels (OTM50). The trace mineral contents in the samples (feed, bone, and excreta) were determined through inductively coupled plasma optical emission spectroscopy. The results indicated that glycinate minerals supplementation at half dose enhanced (p ≤ 0.05) tibial breaking strength compared to the inorganic minerals (38.97 vs. 29.55 MPa). Similarly, egg quality (egg geometry, yolk index, eggshell properties), and hatching traits (hatchability and fertility) were enhanced (p ≤ 0.05) following the use of glycinate organic minerals as compared to inorganic minerals. Copper deposition was higher (p ≤ 0.05) in the OTM100 as compared to other groups. Excreta levels of zinc (Zn) and manganese (Mn) were higher (p ≤ 0.05) in the ITM100 group compared to OTM100 and OTM50. In conclusion, supplementation of glycinate trace organic minerals to layer breeder hens during the late laying cycle had enhanced the bone and eggshell breaking strength, hatching traits, and absorption of certain trace minerals
In Vitro Screening of Antibacterial Efficacy of Moringa oleifera and Thymus vulgaris Methanolic Extracts Against Different Escherichia coli Strains and Their In Vivo Effects Against E. coli-Induced Infection in Broiler Chickens
Full text linkThis study evaluated the antibacterial efficacy and growth-promoting potential of Moringa oleifera and Thymus vulgaris methanolic extracts in broiler chickens challenged with Escherichia coli O78. In vitro antibacterial screening using agar well diffusion and disc diffusion assays revealed that ciprofloxacin exhibited the strongest inhibitory effect, followed by tetracycline and enrofloxacin, whereas among plant extracts, T. vulgaris was more effective than M. oleifera. The optimal combination (M100T150; 100 mg M. oleifera + 150 mg T. vulgaris) produced the largest inhibition zones against E. coli strains. For the in vivo trial, 540 Ross-308 broiler chicks were distributed into six treatment groups in a completely randomized design and reared for 42 days. Parameters assessed included growth performance, carcass traits, gut pH, ileal microbial counts, and intestinal histomorphology. Results showed that E. coli challenge significantly reduced feed intake, weight gain, carcass yield, and villus integrity while increasing FCR and E. coli counts (p \u3c 0.05). Addition of plant extracts, particularly M100T150, significantly improved weight gain, FCR, Broiler Performance Efficiency Factor (BPEF), and Broiler Farm Economy Index (BFEI) compared to the positive control (p \u3c 0.05). Extracts reduced duodenal and jejunal pH (p \u3c 0.001), suppressed E. coli counts (p = 0.003), and enhanced Lactobacillus populations (p = 0.0004). Histological analysis revealed that extract-supplemented groups had greater villus height and surface area with shallower crypts than the positive control, indicating restoration of gut integrity. These findings suggest that methanolic extracts of M. oleifera and T. vulgaris, particularly in combination, can serve as natural alternatives to antibiotics in broiler production under pathogenic challenge