THE USE OF AZOTOBACTER AND AZOSPIRILLUM AS A CATALYST FOR COEXISTENCE OF ZUCCHINI SQUASH WITH SALINITY | ||
ANBAR JOURNAL OF AGRICULTURAL SCIENCES | ||
Article 6, Volume 19, Issue 1, June 2021, Pages 69-83 PDF (1.24 M) | ||
Document Type: Research Paper | ||
DOI: 10.32649/ajas.2021.175974 | ||
Authors | ||
R. A. AL-Hadithi; A. A. Al-Rawi* | ||
University of Anbar - College of Agriculture | ||
Abstract | ||
Chroococcum and A. brasilense bacteria were isolated and identified from the root and the surrounding area of Arundo donax andCladium marisas plants growing in different areas in Ramadi city in order to be used in pollinating the seeds of zucchini squash plant. A pot experiment was carried out in the spring season on 16 ⁄ 3 ⁄ 2019 in one of the fields of the College of Agriculture - University of Anbar, by following the design of complete randomized sectors RCBD. It included two factors of salinity of irrigation water and four levels of S0, S1, S2 and S3 (1.3, 3, 5 and 7 dSm-1) and the factor of adding the bacterial isolates of Azotobacter L1 and Azospirillum L2 and their two mixtures L3, and without adding the L0 inoculum in order to study the effect of bacterial pollination on some growth characteristics of squash plants irrigated with different salinity water levels. The results showed a decrease in plant height, number of leaves and dry weight of the shoots from 53.48 cm, 33.00 leaf-1, 25.97 gm-1 at the S0 level, to 26.95 cm, 14.08 g-leaf-1, and 12.41 g-leaf-1 at the S3 level. The treatment of the two isolates mixture L3 achieved a significant increase in plant height, number of leaves and dry weight, and it was 55.53 cm, 44.00 leaf-1 and 28.33 g-leaf-1 compared with the comparison treatment at the S0 level. The salinity of irrigation water caused an increase in the nitrogen concentration in the vegetative parts of the plant from 1.77% to 2.07%, and caused a decrease in the concentration of phosphorus and potassium from 0.63 and 2.37% to 0.21 and 0.56%. The concentration of nitrogen, phosphorus and potassium significantly increased in the vegetative parts of the plant when the bacterial inoculation treatments were obtained, and the treatment L3 recorded the highest values and reached 2.75% N at the level of salinity of S3 and gave the highest value for the concentration of phosphorus and potassium, which were 0.75 and 2.87%, respectively, at the S0 level. | ||
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