In vitro cyanobacterial isolates growth and their effect on rice crop cultivated in pesticide-treated fields [electronic resource]
Language: English Summary language: Arabic Description: 211 - 218 pOther title:- نمو عزلات السيانوبكتيريا معمليا وتأثيرها على زراعة محصول الأرز فى الحقول المعاملة بالمبيدات [Added title page title]
- Mansoura University journal of agricultural chemistry and biotechnology, 2021 v. 12 (12) [electronic resource].
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Main | ART MUJACB V12 No12 1 (Browse shelf(Opens below)) | Available |
Includes bibliographic reference
An experiment was carried out in Sakha Research Station, Kafrelsheikh governorate, Egypt during the 2018-2019 seasons to isolate the cyanobacteria dominated in the soil samples of rice fields polluted by two pesticides (carbofuran and penoxsulam). These cyanobacterial isolates were identified and the best isolates, regarding growth activities and nitrogen (N2) fixation capacities, were chosen and further applied to the rice field to study their effect on rice yield under different urea concentrations (0, 35 and 69 kg N2/fed). Data revealed that nine cyanobacterial isolates were successfully obtained and purified. A growth curve experiment was conducted on these isolates and revealed that three isolates (Nostoc muscorum, Anabaena cylindrica, and Anabaena variabilis) had the best growth activities and capacities for N2 fixation. Within limit, both pesticides showed stimulation of both cell growth and N2 fixation. With higher concentrations, these values tended to decline due to the possible inhibitory or toxic effect of these pesticides. Generally, cyanobacterial isolates were less tolerant to penoxsulam and were inhibited at lower concentrations compared to carbofuran. With carbofuran application on rice field (Egyptian hybrid rice 1 variety), the interaction between cyanobacteria and urea resulted in the highest grain yield with the recommended dose of urea (69 kg N2/fed), while the highest 1000-grain weight was obtained with half the recommended dose of urea (35 kg N2/fed). Moreover, the use of a mixture of cyanobacterial species rather than a single one resulted in more satisfactory results.
Keywords: Cyanobacteria, Nitrogen fixation, Nostoc, Anabaena,Fertilizers, Rice crop.
Summary in Arabic
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