EL-Aila, H., EI-Ashry, S., Abou Seeda, M. (2002). STUDIES ON A COMPLEX SLOW RELEASE FERTILIZERS: 1I.10NIC COMPOUND ESTABLISHED THROUGH INTERA- CTION BETWEEN ESSENTIAL MICRONUTRIENTS AND UREA AND THEIR EFFECTS ON LETTUCE PLANT. Journal of Soil Sciences and Agricultural Engineering, 27(6), 4311-4324. doi: 10.21608/jssae.2002.255161
H.I. EL-Aila; S. EI-Ashry; M. Abou Seeda. "STUDIES ON A COMPLEX SLOW RELEASE FERTILIZERS: 1I.10NIC COMPOUND ESTABLISHED THROUGH INTERA- CTION BETWEEN ESSENTIAL MICRONUTRIENTS AND UREA AND THEIR EFFECTS ON LETTUCE PLANT". Journal of Soil Sciences and Agricultural Engineering, 27, 6, 2002, 4311-4324. doi: 10.21608/jssae.2002.255161
EL-Aila, H., EI-Ashry, S., Abou Seeda, M. (2002). 'STUDIES ON A COMPLEX SLOW RELEASE FERTILIZERS: 1I.10NIC COMPOUND ESTABLISHED THROUGH INTERA- CTION BETWEEN ESSENTIAL MICRONUTRIENTS AND UREA AND THEIR EFFECTS ON LETTUCE PLANT', Journal of Soil Sciences and Agricultural Engineering, 27(6), pp. 4311-4324. doi: 10.21608/jssae.2002.255161
EL-Aila, H., EI-Ashry, S., Abou Seeda, M. STUDIES ON A COMPLEX SLOW RELEASE FERTILIZERS: 1I.10NIC COMPOUND ESTABLISHED THROUGH INTERA- CTION BETWEEN ESSENTIAL MICRONUTRIENTS AND UREA AND THEIR EFFECTS ON LETTUCE PLANT. Journal of Soil Sciences and Agricultural Engineering, 2002; 27(6): 4311-4324. doi: 10.21608/jssae.2002.255161
STUDIES ON A COMPLEX SLOW RELEASE FERTILIZERS: 1I.10NIC COMPOUND ESTABLISHED THROUGH INTERA- CTION BETWEEN ESSENTIAL MICRONUTRIENTS AND UREA AND THEIR EFFECTS ON LETTUCE PLANT
Soils and ~ater Uses Dept.; National Res. Centre, Dokki, Giza
Abstract
A. series of laboratory and greenhouse experiments were conducted to evaluate ionic compound. formed between urea and essential micronutrient through complexation reaction: Results revealed that lhe addition of metal salt urea without organic matter, slightly increased the pH of the soil. At the beginning of the incubation, citric acid enhanced the E.C. of the soil arid gradually increased up to 28 days of the incubation. Results also showed that the adoltlon of metal salt urea complexed improved the characterization of modified slow release fertilizers through allowing a steady hydrolysis of urea to the soil over a period of six weeks. The addition of Fe or Mn to complexes urea increaseid the availability of iron and manganese in the soil. Citric acid addition gave the highest value of Fe and Mn as compared without citric acid. If was observed that the addition of complexes metal salt urea with citric acid had significantly increased fresh and dry weight of the lettuce plant with gradually increased in .the presence of organic matter at different stages of the growth. Higher
. value of fresh and dry matter production were recorded in the presence of citric acid .due to improving of the fertilizer complexing salt urea mechanisms.
. . . The application of complexing metal salt urea had a positive effect for maintaining Fe in· an active form as Fe?+ in leaves of the lettuce plants reflecting on the increasing 'of chlorophyll content to an extent of healthy plants and thus the ability to overcome the adverse effects of high pH and other ions in soil and then correcting iron chlorosis particularly in newly reclaimed soil.
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