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1.
A laboratory experiment was conducted to investigate the relative mobility of dicyandiamide (DCD) and jointly applied ammoniacal salts or urea in three different soils of lower Egypt, and to determine the extent to which DCD separates from N-fertilizer in unsaturated soil undergoing leaching. The experimental results suggest that, under conditions of water flow, DCD is readily separated from NH4+ but parts from urea to a far lesser extent. The large difference in mobility between DCD and NH4+ should severely limit the effectiveness of DCD as a nitrification inhibitor in the three soils considered when applied in conjunction with ammoniacal salts. In two out of three cases, the situation is similarly unfavorable in the case of joint DCD and urea application. However, the observation that DCD, in a low CEC sandy loam, moves within the soil solution at a slightly lower rate than urea suggests that joint application with urea would keep at least part of the DCD in contact with the NH4+ ions and, therefore, would preserve some of the effectiveness of DCD under leaching conditions in this soil. 相似文献
2.
Kinzel S Koch J Stopinski T Afify M Krombach G Buecker A Küpper W 《Berliner und Münchener tier?rztliche Wochenschrift》2004,117(7-8):334-340
We report our results of partial lumbosacral laminectomy for treatment of canine Cauda equina Compression Syndrome due to a lumbosacral stenosis. Opposite to conventional techniques of dorsal laminectomy, only widening of the Spatium interarcuale is performed. This is achieved by exstirpation of the Lig. flavum and partial dorsal laminectomy of the first sacral segment. The Proc. spinosi and integrity of facet joints are fully maintained by this technique. In 96.5% of 86 dogs treated with this method relief of dorsal pressure and permanent rapid regression of clinical symptoms was achieved. In two cases recurrence of clinical symptoms was observed during follow up and one case showed no improvement at all. In conclusion partial dorsal laminectomy is a minimal invasive technique for treatment of Cauda equina compression syndrome expressed by pain reaction accompanied by minor neurological deficits caused by lumbosacral stenosis. Maintained spinal stability allows short reconvalescence and the unrestricted use of dogs immediately post operation. 相似文献
3.
Mamdouh A. Eissa Saudi A. Rekaby Sabry A. Hegab Hussein M. Ragheb 《Journal of plant nutrition》2018,41(12):1576-1586
Shortage of water in arid and semi-arid regions increases the need of applying efficient drip irrigation system. A two-year field study in the semi-arid region of Upper Egypt was carried in randomized complete block design with four replicates. Wheat plants were irrigated by 100 or 75% of water requirements (I100 = 5,370 and I75 = 4,027 m3 ha?1). Irrigation of wheat by I100 increased growth and uptake of nitrogen, phosphorus, and potassium compared to low irrigation level. I100 caused 14 and 5% increase in straw and biological yield, respectively, compared to I75. Grain yield and water use efficiency (WUE) were higher by 20 and 59% in the case of I75 compared to I100. The use of deficit irrigation in drip-irrigated wheat under arid conditions is an effective tool to maximize efficiency of water use; moreover, 4,027 m3 ha?1 is the optimum irrigation rate for maximum WUE and grain yield. 相似文献
4.
Attia Marwa M. Elgendy Mamdouh Y. Abdelsalam Mohamed Hassan Azza Prince Abdelbary Salaeh Nagla M. K. Younis Nehal A. 《Aquaculture International》2021,29(3):1393-1407
Aquaculture International - Molecular and immunological aspects of heterophyid infections in mullets are scanty. This study was initiated to identify heterophyid encysted metacercariae infecting... 相似文献
5.
Broom Mohammed Gabr Mohamed Hosny Al-Harbi Mamdouh Satheesh Sathianeson 《Aquaculture International》2021,29(6):2403-2414
Aquaculture International - In recent years, the demand for commercial sea cucumber diet increased due to the expansion of sea cucumber farming. In this study, we investigated alternative sources... 相似文献
6.
Elgendy Mamdouh Y. Abdelsalam Mohamed Mohamed Samaa Ahmed Ali Shimaa E. 《Aquaculture International》2022,30(2):845-862
Aquaculture International - Columnaris is a common flavobacterial disease affecting tilapia aquaculture. Flavobacterium columnare has been identified as being responsible for the heavy mortalities... 相似文献
7.
Mamdouh A. Eissa 《Journal of plant nutrition》2016,39(11):1620-1626
Phosphorus (P) is an essential nutrient for the higher plants and has low mobility and availability in soils. Good fertilization management for this nutrient may be lead to increasing its availability. A field experiment in a split plot design was conducted out during the 2003 and 2004 summer growing seasons to study the effect of frequency of P fertigation and different forms of P fertilizers on uptake of P by corn plant as well as yield production. The high frequency of P fertigation increased P uptake significantly (p < 0.05) by 12 and 19% in the first and second season respectively. Phosphoric acids (PA) followed by urea phosphate (UP) gave the highest significant biological yield (25.67 and 24.5 ton/ ha). From the results of this study, it may be recommended that in sandy calcareous soils P must be added every three days using acid forms. 相似文献
8.
Mamdouh A. Eissa Saudi A. Rekaby Sabry A. Hegab Hussein M. Ragheb 《Journal of plant nutrition》2018,41(11):1414-1424
Limited water availability in arid and semi-arid wheat production systems increases the need of applying efficient drip irrigation systems. However, there is little information available about the optimum level of nitrogen (N) fertilization for drip-irrigated wheat. A two-years field study in the semi-arid region of Upper Egypt was carried out in a randomized complete block design to investigate the response of drip-irrigated wheat to three levels of N fertilization (N120 = 120, N180 = 180, and N240 = 240 kg ha?1). N240 increased the uptake of N, P, and K by 66.3, 48.6, and 43.5%, respectively, as compared to N120. The application of N240 increased the grain yield by 28.4 and 40.4% and water use efficiency by 27.6 and 41.8% the first and second season, respectively, as compared to N120. Based on the obtained results, it is recommended to fertilize drip-irrigated wheat by 240 kg ha?1. 相似文献
9.
Mamdouh Allawzi Mohammad Al-harahsheh Hussein Allaboun 《Water, air, and soil pollution》2018,229(5):153
The leachability of bottom medical waste ash from a Jordanian incinerator was studied in this work. The ash was characterized in terms of particle size distribution, chemical and mineralogical composition followed by leaching of several size fractions at different conditions (leaching time, temperature, initial pH, particle size, and solid liquid ratio). The major elements found in the ash were Ca, Si, Al, Cl, Na, Fe, Ti, S, Mg, Ba, and K, while the main mineral phases found in the ash were calcite, halite, sylvite, anhydrite, hematite, hydrochlorborite, cristobalite, melanterite, and chlormayenite. Leaching data indicates that as leaching time and S/L increased, the concentration of metals increased in the leachate. The highest leaching level was at a S/L ratio of 60 mg/ml. As the particles sizes decreased, the concentration of the majority of metals studied increased. Meanwhile, the effect of particle size on other metals was not regular due to the fact that sieving resulted in more concentrated metals in certain particle size fractions. Leachability results also indicate that variation in the initial pH has a slight effect on the degree of leaching. The concentration of some metal ions increased with temperature, while others increased initially but subsequently decreased. The extracted quantities of all the heavy metals were less than the limits set by EPA. 相似文献
10.
Nitrogen fertilization management under water limited conditions needs to be refined to save environmental ecosystems and increase economic returns. Two-year field studies in a split-plot design were conducted to investigate the response of maize to different nitrogen rates (N100 = 100, N130 = 130, and N160 = 160?kg N ha?1) under two irrigation levels (100 or 75% of water requirements). Under deficit irrigation, water and N were used more efficiently than normal water supply. N-fertilization of drip irrigated maize grown under deficit irrigation with N160 increased the uptake of N, P and K by 35, 29 and 70% compared with N100. Fertilization of maize grown under deficit irrigation with N160 increased the grain, straw and biological yield and water use efficiency by 50, 14, 22 and 33% compared with N100. Based on the obtained results, 160?kg of N ha?1 is the optimum rate of N for maize irrigated by 75% of water requirements. 相似文献