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To investigate the effect of nitrogen fertilization forms (ammonium sulphate and calcium nitrate) and some bio-stimulants (humic acid, fulvic acid, EM and yeast extract) under high temperature on flowering characters, yield and its components of cucumber (Cucumis sativus L.) cv. Prince, two field experiments were carried out in a private farm at El-Mahalla El-Kubra-Gharbia governorate during the two successive summer seasons of 2011 and 2012 Results showed that the (50%NH4 + 50%NO3) treatment of N-forms increase No. of female flowers, fruit setting, early and total yield significantly, while No. of male flowers and sex ratio decreased significantly. Foliar spraying of cucumber plants with bio-stimulants significantly increased the mean values of the No. of female flowers, fruit setting early and total yield as compared with the control treatment. The best foliar application were yeast extract at 10 g/l or effective Microorganisms (EM) at 20 ml/l. Therefore we recommend using nitrogen fertilization as (50% NH4 +50% NO3) combined with spraying yeast extract at 10 g/l or effective Microorganisms (EM) at 20 ml/l under high temperature conditions.

This study was conducted during the two summer seasons of 2007 and 2008 at Abou Awad Village, Aga, Dakahila Governorate, Egypt, on summer squash Arlika F1 hybrid, to investigate the utilization of some different sources and rates of organic manures (mineral N fertilizer, rice straw compost, chicken and farmyard manure) at 200 % and 100% of recommended rate/fed. from each source with foliar spraying of seaweed extracts (without and with 1g/ l) compared with mineral nitrogen fertilizer at 100 % and 50 % of recommended rate/ fed. and their interactions on plant growth, yield and quality as well as mineral NPK content. A split-split plot design in complete randomized blocks with three replications in both seasons, seaweed extracts represented in the main plot which were sub divided to four sub plots were occupied with the treatments of organic nitrogen fertilizer sources while rates of organic nitrogen sources were assigned to the subsub plots. The results indicated that most of plant growth parameters were significantly increased by foliar spraying with seaweed extracts of summer squash in both seasons. In addition, the treated squash plants with seaweed extracts produced more early yield, total yield and vitamin C content and lower nitrate content in fruits. Moreover, an increase in NPK content in the leaves and fruits as compared with control were detected in the two growing seasons. Application of compost manure (rice straw) gave the highest values of fresh and dry weight/plant, total yield and dry matter in both seasons. However the best early yield was obtained with chicken manure and FYM in the first and second seasons. While, lower nitrate content in the fruits was obtained with FYM and compost in the first and second season, respectively. With increasing the rate of organic nitrogen fertilizer addition, all vegetative growth parameters, early yield, total yield and fruits quality as well as NPK in the leaves and fruits were significantly increased. The interaction between seaweed extracts and organic nitrogen fertilizer sources and rates gave the highest values of vegetative characters, total yield in both seasons, but vitamin C in fruits was increased in the first season when summer squash plants was fertilized with rice straw compost at 200 % of recommended rate with spraying by seaweed extracts. In general, it can be concluded that: 1-By conducting economical estimation, it appears that the maximum net return (4992 and 4854 L.E./fed.) were obtained with foliar spraying by seaweed extracts in combination with 200 % of FYM, followed by rice straw compost at 200 % of recommended rate/fed. respectively, comparing with control. 2-There are good opportunities to utilize and manipulate rice straw compost to enhance crop productivity and synonym essential to adopt a system of organic farming for obtained safe and clean food of vegetable crops against the chemical farming and also, reduce the risks of the environmental pollution. 3-Moreover, application organic manure affects of the chemical and physical propertie...

In this investigation three inbred lines which were desired from Balady squash population by selection and their 6 F1 hybrids including reciprocal were used as genetic materials. The inbred lines and their F1 hybrids included reciprocal hybrids were evaluated for some economic traits; vegetative growth, flowering and earliness as days to first female flower anthesis, fruit, as well as yield and its component traits in field trial during 2014 summer season. The result of mean values showed that no parental line was superior for all studied traits. Meanwhile, the parent P3 exhibited the best values for most studied traits. As well as, the obtained results showed that the highest values recorded in the F1 hybrids compare with their parents (inbred lines) were; i.e., P3xP2 for earliness and sex ratio, P3xP2 for fruit number per plant, P1xP3 for total yield per plant. As well as, P1xP2 for total soluble solid and dry weight of fruits, P2xP3 and P3xP1 for ascorbic acid content. These crosses could be used as commercial cultivars which may compete with imported hybrids. Moreover, their parents (stable inbred lines) which exhibited best combinations for previous traits could be used in breeding program according to their objectives.

This work was carried out of private farm located in Qalabshu, Gamasa District, Dakahlia Governorate, Egypt, during the early summer plantings of 2017 and 2018 to study the effect of different sources of organic manures and different levels of humic and fulvic acid on growth, flowering, yield and its components and sugar in fruit of watermelon plants (Citrullus lantus L.) c.v. Romero grafted on Shantosa species. Twenty two treatments were designed in complete randomize block system with three replications, The treatments consisted of (FYM, Compost, Chicken manure and mix between them) in presence of 2 and 4 kg for each humic and fulvic acid comparing to the control. The results obtained shows that there were significant differences among treatments in most parameters during the two seasons. All organic sources increased all parameters and found that the highest significant values of leaf area, dry weight, number of male and female flower as well as average weight of fruits, number of fruits, dry matter, total yield, reducing , non reducing and total sugar of fruits were recorded with application of (FYM + compost + chicken manures) in presence of 4 kg humic and 4 kg fulvic acid.