Printing ISSN2708-857X
Online ISSN 2708-8588
Online ISSN 2708-8588
https://doi.org/10.36602/jmuas.2021.v02.02.01
Abstract... Abstract
The current study was conducted in laboratories of department of Plant Protection, university of Tripoli to evaluate the ability of four Trichoderma isolates namely: T. viride (T1); T. longibrachiatum (T2); T. koningii (T3); T. viride (T4) to antagonize four isolates of the pathogenic fungi Rhizoctonia solani isolated from soil and potato tubers (Solanum tuberosum L.) infected with black scurf disease collected from four areas of Tripoli: Tajourah (R1); Garabouli (R2); Gaser Benghasheer (R3); Janzour (R4). Experiments were conducted as Complete Randomized Design (CRD). Results of mycoparasitism and non-volatile metabolites showed 100% inhibitions of all tested Rhizoctonia isolates treated with (T1). Moreover, T4 isolate caused 80%, 5% inhibition of R1, R2 growth, respectively, in metabolite volatiles experiment. Microscopic studies of anatagonisim showed direct mycoparasitism including: lysis, granulation and coiling of Rhizoctonia by Trichoderma hyphae.
Abstract... Abstract
This experiment was carried out during the agricultural season 2017-2018 in the Samnu region, which is one of the southern Libyan regions, with the aim of identifying the optimum amount of nitrogen that gives the highest productivity of tricycle compared to wheat, as well as the effect of late cultivation on tricycle and wheat, as well as the impact of agriculture in saline soils and water on the growth indicators for wheat plants and tricycle.
In this study, wheat and tricycle were used and six levels of nitrogen (0, 50, 100, 150, 200, 250 kg nitrogen / ha).
The results gave preference to the treatment of 150 kg nitrogen / ha for most growth indicators for wheat plant (leaf area, grain weight, straw weight, weight of the whole plant, and the treatment gave 200 kg nitrogen / hectare the highest height of the plant, while the treatment 250 kg nitrogen / ha gave the longest spike except There were no significant differences between them and the treatment with 150 kg nitrogen / ha.
As for the tricycle, the treatment gave 200 kg nitrogen / ha best results for all studied growth indicators.
As for the comparison between wheat and triticale plants, the preference of the wheat plant was greater than the wheat in relation to the weight of the grains or the yield and the weight of the straw or hay, and the reason for this is that the triticale plant was affected compared to the wheat in the late cultivation, where the late sowing prevented the triticale mulch at least two fillings. The wheat plant has a higher tolerance or resistance to salinity than the triticale plant.
Abstract... Abstract
The objective of this experiment was to study the effect of NPK (12, 24, 12) fertilization on growth of tomato (Solanum lycopersicum cv., Dahab) irrigated with saline water. Experiment was set up at a greenhouse of Horticulture unit, Center of researches and experiments, Faculty of agriculture, University of Tripoli, in 2020. Plants were grown in pots under an irrigation salinity level (EC= 5.0 dS m-1); a nonsalinized control (EC = 0.07 dS m-1), and three different rates of NPK, 200kg h-1 (recommended amount under non-saline condition), 300kg ha-1, and 400kg ha-1. The measurements recorded were, vegetative fresh weight (g), number of leaves, root fresh weight (g), two metabolites related to salt stress were also measured including; chlorophyll and ascorbic acid levels in leaves. The results showed that increasing salt concentration in irrigation water to ( EC = 5.0 dS m-1) resulted in a significant decrease in each of vegetative fresh weight, root fresh weight and leaves chlorophyll content by 19%, 47%, and 15%, respectively; while, leaves number per plant and leaves ascorbic acid level were not significantly affected. Increasing NPK fertilization more than the recommended amount used in non-saline conditions (200 kg ha-1) did not promote growth and no significant effect was recorded in all parameters tested.
Our results suggested that while salinity promotes salt damage in tomato plants, additional NPK fertilization beyond the recommendation is not beneficial in alleviating salinity stress; however, this should be confirmed by field assessment.
Abstract... The study aimed to estimate the functions of production costs in the long term, to determine the optimal output, the maximum output of profit, and the elasticity of production costs in the meat poultry production farms in the municipality of Bani Walid. To achieve the objectives of the study. The results showed that the optimum output was about 1.68,1.69 tons per thousand chicks, for the first production capacity and the second production capacity respectively. The results of the study also showed that the most profit yield was about 1.76,1.74 tons per thousand chicks, for the two production years, respectively. The results indicated that the elasticity of production costs amounted to about 0.29.0.56 per thousand chicks for the two production years, respectively. Which means that the production of meat chickens is still in the stage of increasing the return of capacity, and the results of the study showed that the net return was estimated at 1088,1662 dinars per thousand chickens, for the two production capacities respectively. The study recommends rationalizing the use of economic resources and working on replacing high-yielding strains with low-productivity strains in order to reach the optimum output, which achieves the lowest average costs of producing a ton of meat poultry.