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Copyright of Egyptian Journal of Agronematology is the property of Egyptian Society for Agronematology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Assiut Journal of Agricultural Sciences is the property of Egyptian National Agricultural Library (ENAL) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study was carried out during 2018 and 2019 seasons at the Experimental Farm of the Water Studies and Research Complex (WSRC) Station, National Water Research Center, Toshka Region, Egypt (22°32′16″N, 31°30′40″E), to study the effect of two amino cat fertilizer concentrations (AA1: 100 cm³ fed-1 and AA2: 200 cm³ fed-1), six different combinations of mineral NPK and nano-fertilizers (F1= 0.0 fertilizers-control treatment, F2= 100% mineral NPK (120:30:24 kg fed-1), F3= 100% Nano NPK )10 kg fed-1), F4=75% mineral NPK +25% Nano NPK, F5=75% Nano NPK +25% mineral and F6= 50% mineral NPK +50% Nano NPK( on grain production and its attributes as well as net economic return on two yellow maize hybrids (M1: T.W.C. 353 and M2: T.W.C. 360). The experiment was laid out in a strip split-plot design with three replications, where amino cat fertilizer allocated in vertical-plots, fertilization treatments were arranged in horizontal-plots and maize hybrids were occupied the subplots. Studied traits were number of days to 50% tasseling, number of green leaves plant-1, ear leaf area, plant height, ear length, number of ears plant-1 and grain yield fed-1. Obtained results showed that maize hybrids, amino cat fertilizer, fertilization treatments, and their interactions significantly influenced most studied traits in both seasons. TWC 353 hybrid gave the maximum mean values of all studied traits in both seasons. Foliar spraying with 200 cm³ amino cat fertilizer was significantly associated with corresponding increases in all studied traits especially grain yield (3.02 and 3.06 ton fed-1) in the 1st and 2nd seasons, respectively. Maximum average values of studied traits were obtained using 50% mineral fertilization + 50% nano- NPK fertilization in both growing seasons. Foliar appliction of TWC 353 hybrid with 200 cm³ aminofertilizer, beside fertilization by 50% mineral NPK+50% NPK nano-fertilizers (M1AA2F6), recorded the highest values for net farm incom (12926 L.E fed-1), net farm return (6360 L.E fed-1), BCR (1.97) and economic efficiency (net return/total costs=0.97). This result is due to the highest grain yield prodictivity under this treatment (3.77 ton fed-1) as an average of the two seasons compared with other treatments. Generally, it could be concluded that foliar spraying of maize hybrid TWC 353 with 200 cm³ fed-1 amino cat fertilizer plus 50% mineral fertilization + 50% nano-NPK fertilization resulted in highest growth, production and net farm return under the environmental conditions of Toshka region. [ABSTRACT FROM AUTHOR]

Two field experiments were carried out in the Agricultural Research Station, Faculty of Agriculture, Zagazig University, El-Khattara Region, Sharkia Governorate, Egypt, during the two winter seasons of 2015/2016 and 2016/2017 to find out the response of faba bean (improved Giza 3 cv.) to three planting densities (80000, 100000 and 120000 plants/fad.), three humic acid rates (zero, 2 and 4 kg humic acid/fad.) and four phosphorus levels (zero, 15.5, 31 and 46.5 kg P2O5/fad.). The results of the combined analysis revealed that increasing planting density significantly decreased number of pods and branches/plant, and seed weight/plant as well as protein yield/fad., while, plant height and biological yield/fad., were significantly increased by increasing plant densities up to 120000 plants/fad. The highest value of seed yield/fad., was obtained by planting faba bean on density 100000 plants/fad. Results of the combined analysis also showed that, increasing humic acid rates up to 4 kg/fad., significantly increased number of pods/plant, weight of seeds/plant and protein yield/fad., but, hundred seed weight, plant height and number of branches/plant were not affected by the application of humic acid. Meanwhile, biological and seed yields/fad., were responded to the application of humic acid rate up to 2 kg/fad. In general, application of phosphorus fertilizer up to 46.5 kg P2O5/fad., significantly increased all traits under study such as number of branches and pods/plant, weight of seeds/plant, seed and biological yields/fad., and protein yield/fad as compared to other rates (combined data), while, hundred seed weight significantly increased by increasing P levels up to 31 kg P2O5/fad. Interaction results showed that, faba bean plants received 31 kg P2O5/fad., and 2 kg humic acid/fad., or received 2 kg humic acid under medium density (100000 plants/fad.) produced the highest value of seed yield/fad. [ABSTRACT FROM AUTHOR]

Two field experiments were conducted at the Agricultural Research Station, Faculty of Agriculture, Zagazig University at El-Khattara Region, Sharkia Governorate, Egypt, during two summer successive seasons (2012 and 2013) to study the effect of three plant densities (24000, 28000 and 32000 plants/ fad.), four nitrogen fertilizer levels (50, 75, 100 and 125 kg N/fad.) and three organic manure rates (check, 2.5 and 5 tons/fad.) on yield and its attributes of yellow maize (single cross 173). The results of the combined analysis revealed that low and moderate densities significantly increased ear and kernel yields/plant as well as kernel and biological yields/fad. In addition, increasing plant density more than 24000 plants/fad., significantly increased shelling %, while plant densities had no significant effect on number of ears/plant, ear diameter, ear length, number of rows/ear, number of kernels/row and hundred kernel weight. Data of the combined analysis also showed that increasing nitrogen fertilizer level from 50 to 75 and 100 kg N/fad., significantly increased number of ears/plant, ear diameter, ear length, number of kernels/row, 100 kernel weight, ear yield/plant, kernel yield/plant, ear, kernel and biological yields (ton/fad.) with the exception of number of rows/ear and shelling % (combined data). Application of organic manure up to 5 tons /fad., significantly increased ear length, number of rows/ear, number of kernels/row, hundred kernel weight, ear and kernel yields/plant, ear, kernel and biological yields/fad., as compared to other rates (combined data). The obtained data showed that maize plants received 100 kg N/fad., and 5 tons organic manure /fad., under light density (24000 plants/fad.) and medium density (28000 plants/fad.) produced the highest value of kernel yield/fad. While, under the high density (32000 plants/fad.) kernel yield/fad., was higher when 75 kg N/fad., and 2.5 tons organic manure/fad was used. [ABSTRACT FROM AUTHOR]

The article presents comparative studies on the effects of herbicide atrazine on freshwater fish Oreochromis niloticus and Chrysichthyes auratus at Assiut, Egypt. The present study dealt with the alterations in the physiological effects of atrazine herbicide on two of the most important Nile fish, Oreochromis niloticus and Chrysichthyes auratus. The researchers investigated the hematological changes on some selected serum components and AChE. Fish exposed to atrazine in concentrations of 3 and 6 milligrams per liter showed some clinical signs such as rapid respiration and increased rate of gill cover movements, Slow down of reflexes and swimming movements and reduction in the feeding activities were also observable signs in exposed fish.

Tetrodotoxin (TTX) is a potent marine neurotoxin named after the order of fish from which it is most commonly associated, the Tetraodontiforms, or the tetraodon pufferfish. In the present study the crude TTX was extracted from pufferfish Lagocephalus sceleratus collected from the Red Sea in Egypt. The LD100 and LD50 of crude TTX were found to be 8.33 and 6.26 mg/kg for the gonad extract and 41.8 and 27.9 mg/kg for the skin extract, respectively. This indicates that the gonad TTX is more lethal than the skin. The effects of both gonad and skin TTX extracts on the levels of brain serotonine, acetylcholine, histamine, norepinephrine, and epinephrine were studied in rats. Brain serotonine level was significantly increased and reached its peak level after 4 hours (P<0.001) of TTX administration. Brain acetylcholine, histamine, and norepinephrine levels were also significantly increased but reached peak level after 6 hours (P<0.001). The effect of the gonad extract was more significantly profound and of longer duration than the skin extract. On the other hand, brain epinephrine did not show any significant change during the experimental period.