No abstract

This study was conducted to investigate the response of date palm (Phoenix dactylifera, L.) cv Zaghloul, to nine different fertilizer treatments i.e. Control (1.5 N), full nitrogen (N) dose (100%) as mineral fertilizer (recommended rate), quarter organic fertilizers + 3/4 mineral, half-N dose as organic fertilizers + half as mineral, full N dose as organic fertilizer, quarter organic fertilizers + 3/4 mineral + bio-fertilizers (EM). half-N dose as organic fertilizers + half as mineral+ bio-fertilizers, full N dose as organic fertilizer+ biofertilizers and bio-fertilizers. The experimental design was complete randomize block design with three replicates under El Adlia, Blbas, Sharkia Governorate, Egypt during two successive years (2017 and 2018).The results showed that full N dose as organic fertilizer+ biofertilizers gave the highest leaf number/palm, leaf length and leaf area index. Applied the full N dose as organic fertilizer+ bio-fertilizers gave the highest number of leaflets/leaf and leaflet length whereas; addition bio-fertilizers only produced the highest value of leaflet width. Also, our results clear that added half N dose as organic fertilizers + half as mineral enhanced the leaf chlorophyll content, but the addition full N dose as organic fertilizer+ bio-fertilizers increased carotenoids content.Conclusively, from previous results, it can concluded that organic and bio-fertilizers enhancement all vegetative growth parameters of Zaghloul date palm cv. To reduce dates pollution, prefer replacement mineral fertilizer by organic and bio-fertilizers.

No abstract

Two factorial experiments (2 X 5) were conducted at greenhouse of the Experimental Farm of Ismailia Agriculture Faculty, Suez Canal Univ. Egypt during 2007 and 2008 seasons to assess the growth performance and nutrients uptake efficiency of 13-mounth-old seedlings of two common mango cvs (Zebda and Succary) grown in a sandy soil under four levels of CaCO 3 (10, 15, 20 and 25%), beside the native content of 0.29% as control.Differential ability of the two tested mango cvs to tolerate lime was detected since, Succary cv exhibited high sensitivity compared to Zebda cv. Presence of lime up to 10% significantly depressed plant height, leaves number/plant, average leaf area and total leaf area/plant, as well as leaves, stems, roots and total dry weights/ plant of the two cultivars. Depression in vegetative growth parameters and dry weights with upraising soil lime content was more pronounced in Succary cv than Zebda cultivar.Zebda cv had the highest uptake efficiency of K and Ca as shown by their concentrations in leaf tissues. While, foliar concentrations of N and Zn appeared an opposite trend. There is an insignificant differences between the two cvs in foliar P and Fe concentrations.Regardless of mango cv, high soil lime content drastically reduced foliar nutrients concentrations except Calcium. It seems that cv Zebda is the most adaptable to overcome severity conditions of highly calcareous soil, thus it can be recommended as a lime-tolerant mango rootstock. More, long-term intensive physiological and genetic studies are needed to confirm this result, and to test wide range of mango cultivars under large scale of field conditions.

The current investigation was carried out during 2015 and 2016 seasons on El-mamoura guava fruits (Psidium guajava L.) to study the effect of calcium nitrate and chitosan coating treatments on the physico-chemical characteristics of the fruits during cold storage period. All treatments prevented fruit decay compared with control which lost 26.14 % (average of the two seasons) of its fruits. Guava fruits didn't lost any weight during the first two weeks of cold storage in both seasons and after 43 days the least weight loss percentages were for the treatments of Calc. Nit. 4% + Chitosan 0.5% in the first season and Calc. Nit. 2% + Chitosan 1% in the second season. The above treatment of Calc. Nit. 2% + Chitosan 1% had the highest significant average of V.C and gave the highest firmness values in both seasons and its fruits had the highest citric acid content in the last interval of the first season. All treatments maintained the TSS content in guava fruits during cold storage period and the treatment of Calc. Nit. 4% + Chitosan 0.5% had the highest significant average value in both seasons. Conclusively, it is recommending treatment with 0.5% chitosan as a coating and calcium nitrate 5 % to guava fruit cv. ELmamoura to improving fruit quality for cold storage a long time.