Mohamed Ahmed - Academia.edu (original) (raw)

Papers by Mohamed Ahmed

This experiment was carried out during the summer seasons of 2014 and 2015, at a private farm in ... more This experiment was carried out during the summer seasons of 2014 and 2015, at a private farm in Kotur District, El-Gharbiah Governorate, Egypt, to study the effect of magnetic irrigation water under four levels of water regimes (45%, 50%, 55% and 60%) of the field capacity on soil salinity, growth, yield, tubers quality of potato (Solanum tuberosum L.) var. Diamont. The experimental design was a split plot design with three replications. The Irrigation with magnetic water was in the main plots while the water regimes were randomly arranged in the sub plots. The obtained results indicated that, vegetative growth, yield and its components as well as some chemical contents of potato tubers were significantly increased by application of magnetic water as compared with untreated water, especially at 60% or 55% of the field capacity. The application of magnetic water at 60% or 55% of the field capacity decreased soil salinity and available nutrients (N, P, and K) increased. The combinations between the application of magnetic water and water regimes at 60% or 55% enhanced water use efficiency, tubers quality and yield of potato. Thus, the used of magnetic water and irrigated at 55% or 60% of the field capacity can be recommended to enhance vegetative growth, yield, its component of potato plants, reduce soil salinity and improve soil fertility.

Increasing growth and productivity of food crops via safe biostimulants is a very important issue... more Increasing growth and productivity of food crops via safe biostimulants is a very important issue in the current years. This study aimed to investigate the potential of moringa leaf extract (MLE) in improving the performance of snap bean (Phaseolus vulgaris L.) cv. 'Paulista' under field conditions. Hormonal analysis of MLE revealed its richness of various classes of phytohormones particularly salicylates. The results revealed that all MLE concentrations had a positive effect on growth, biochemical, yield, and yield related traits as well as yield quality of snap bean compared to control, and the effect was dose-dependent. Moreover, increasing pods yield of snap bean may be related to gibberellins (GA 7 ) content than other plant hormones. In conclusion, the leaf extract of moringa provides a good source of phytohormones that have a positive role to stimulate growth and productivity of snap bean plants.

Agricultural wastes cause a serious environmental problem in E gypt. Utilization of these wastes... more Agricultural wastes cause a serious environmental problem in E
gypt. Utilization of these
wastes by an environmentally friendly way is a very important
issue. The objective of this study
was to utilize rice straw into high-value products. Antioxidant acti
vity, total soluble phenols, and
flavonoids were evaluated in ethyl acetate extract prepared
from rice straw after alkaline hydrolysis.
Total phenols were found to be 221.6 mg gallic acid equivalents (GAE)
, while total flavonoids were
4.9 mg rutin equivalents (RE). The extract exhibited strong
antioxidant activity
measured by the
1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method and its
IC
50
value was 0.4 mg/ml.
Furthermore, the ethyl acetate extract possessed high antioxi
dant activity assayed by
β
-carotene
bleaching method and its value of lipid peroxidation inhibition (LPI)
was 75.4%. It also exhibited
high reducing power and its IC
50
value was equal to 0.06 mg/ml. HPLC analysis indicated that this
extract contained seven phenolic acids including; protocatechuic, caff
eic, syringic,
p
-coumaric,
ferulic, rosmarinic and cinnamic, in addition to two flavonoids; qurecetin
and kaempferol. Results
indicated that ferulic and
p
-coumaric acids were the major soluble phenolic acids in rice
straw, and
their concentrations were 3.9 and 2.9 mg/g DW. It can be summarized t
hat the strong antioxidant
activity of ethyl acetate extract, prepared from rice st
raw, was highly correlated with its high level
of phenolic compounds.

Dokki) were evaluated in field trial in a randomized complete blocks design with three replicatio... more Dokki) were evaluated in field trial in a randomized complete blocks design with three replication in summer 2012. The study was carried out at the Experimental Farm of the Faculty of Agriculture, Tanta University, Egypt. This work was carried out to study types of gene action, degree of dominance heritability and expected genetic advance for yield and its components and fruit characteristics. Ananas El-Dokki cv. exceeded Ananus d'Amerique a Chair Rouge cv. and Top Mark cv. in all studied traits except number of fruits/plant, flesh firmness, and flesh color. Heterosis relative the better parent was positive and significant or highly significant for fruit yield/plant, fruit weight, flesh thickness, and TSS (Brix) in the two crosses. However, heterosis over the better parent was insignificant or had negative values for the other traits under study. The obtained results encourage producing F1 hybrids for commercial production. In the seconde cross Top Mark×Ananas El-Dokki, heritability estimates, in broad sense were high for all traits under study. Heritability estimates, in narrow sense were high for fruit weight and fruit flesh firmness in the second cross Top Mark×Ananas El-Dokki, and moderate in first one for fruit length, fruit flesh firmness, and flesh color. The genetic advance under selection was high in the first cross, while it was low in the second one for the same traits.

This study was carried out at private farm under clay soil at Shoubra belola, Kotour, Gharbia gov... more This study was carried out at private farm under clay soil at Shoubra belola, Kotour, Gharbia governorate, Egypt during the two successive winter seasons of 2007-2008 and 2008-2009. The aim of this study was to evaluate the effect of humic acid, different application methods of potassium fertilizer and their combinations on the growth, yield, quality and storability of garlic (cv. Balady). Results showed that, vegetative growth, yield, quality, storability and N, P, K contents of bulbs and leaves were increased by applying humic acid (HA) or potassium fertilizer (K) and their combinations. Soil application of HA at 5 kg/fed. plus foliar application of 3% K2O + 48 kg K2O /fed. as soil dressing (K4) resulted in the best results in this respect. By applying this treatment the producers can add the requirements of garlic from potassium fertilizer by an alternative method of application and cheaper potassium forms consequently, saving the quantity of potassium chemical fertilizer.

This study was carried out during 2005, 2006 and 2007 seasons. Crossing were made among five cul... more This study was carried out during 2005, 2006 and 2007 seasons. Crossing were made among five cultivars of watermelon (Citrullus lanatus Thumb.) viz., Giza No.1, Charleston Gray 133, Crimson Sweet, Sugar Baby and Peacock WK 60 to produce 10 F1 crosses. Parents and their crosses were evaluated in field trials in two locations: the first location at Kaha Vegetable Research Farm, Kalubia Governorate, and the second location at Sids Experimental Station, Beni Suef Governorate. The two locations are belonging to the Horticultural Research Institute, Agricultural Research Center, Ministry of Agric. Heterosis based on the mid-parents and high-parent were significant with positive and negative values for all studied traits, except average fruit weight for mid-parents in the two locations and total soluble solids in second location for both mid-parents and high-parent. Effects of general combining ability (GCA) were significant for all yield and fruit traits at both locations, except for P4, which showed insignificant positive values for yield traits. Estimated specific combining ability (SCA) was significant for all yield and fruit traits at both locations, except fruit diameter and fruit shape index at both locations which showed insignificant positive values. These results indicate that both additive and non-additive gene effects are involved in the inheritance of the studied traits. The additive gene action was more important than the non-additive ones in the genetics of most studied traits.

The aim of this research was to study the effect of foliar spraying with different concentrations... more The aim of this research was to study the effect of foliar spraying with different concentrations of
application of molybdenum (Mo) and magnesium (Mg) on the vegetative growth, chemical content and curds
yield of cauliflower cv. Amshiry under field conditions. Plants were sprayed with 15, 30 and 45 μg/l Mo at 20,
40, 60 and 80 days after transplanting, whilst Mg was foliar sprayed at 0.25, 0.50 and 0.75% at 15, 35, 55 and 75
days after transplanting. Results showed that 30 and 45 μg/l Mo significantly improved vegetative growth
parameters, curds yield and its components and chemical composition of leaves and curds. Likewise, using 0.50
and 0.75% Mg significantly enhanced foliar fresh weight, plant height, leaves fresh weight and leaves dry
weight, total and marketable curds yield and chemical composition of leaves and curds. From these results, it
could be recommended that molybdenum and magnesium individually or in combination are important and
essential elements in the chemical fertilization management system for the cauliflower production cultivated
under Egyptian soil conditions.

Two field trials were conducted at the Experimental Farm of the Faculty of Agriculture, Tanta Uni... more Two field trials were conducted at the Experimental Farm of the Faculty of Agriculture, Tanta University,
Egypt, during the summer growing seasons of 2011 and 2012, to evaluate the effect of some bio organic and mineral
fertilizers (compost at 10, 15 and 20 ton/fed., Easternabiofert at 50, 100 and 150 kg/fed. plus recommended dose of
organic manure, the mixture of bio-fertilizers (Phosphorein, Potassiumage and Rhizobacterin) combined with 75%
of the recommended dose of mineral fertilizers and farmyard manure and 100 % of recommended dose of mineral
fertilizers plus farmyard manure) on growth, flowering, yield and fruit quality of sweet pepper plants cv. California
Wonder. The obtained results indicated that, the application of the three treatments; (the first was recommended
dose of NPK plus farmyard manure, the second was 75% recommended dose plus Phosphorein, Potassiumage and
Rhizobacterin the third treatment was Easternabiofert at 150 Kg/fed plus recommended dose of organic manure,)
followed by compost at 20 ton/fed., significantly increased plant height, number of branches per plant, number of
leaves per plant, fresh and dry weight of whole plant, photosynthetic pigments i.e. chlorophyll a, b and carotenoids,
Endogenous phytohormones i.e. auxins, gibberellins and cytokinins, fruit weight, number of fruits per plant, dry
weight of fruit and early and total fruit yield. Also, significant effects were obtained for N% and P% in the leaves as
well as Vitamin C, N % and P % in the fruits in both seasons. There were no significant differences between these
treatments and the complete recommended dose of NPK mineral fertilizers in this concern. Different Bio organic
treatments resulted in the lowest values of nitrate in fruits, in the two growing seasons. The application of 75%
recommended dose of NPK and organic manure plus the mixture of bio-fertilizers (phosphorein, potassiumage and
rhizobacterin) or Easternabiofert at 150 Kg/fed plus recommended dose of organic manure can be used in sweet
pepper production without reducing the productivity and quality. These bio organic fertilizers treatments will reduce
the cost of chemical fertilizers, avoid the risk of nitrate accumulation in the edible portions and decrease the
pollution of the environment. Also, applying the compost at 20 ton/fed. leads to lower productivity compared to the
full dose of mineral fertilizers, but the yield will be higher in price, achieving more profit for producers.