INTEGRATED EFFECTS OF MICROBIAL GIBBERELLIC ACID AND VITAMINS ON NUTRIENT UPTAKE, ONION AND WATER PRODUCTIVITY, AND CALCAREOUS SOIL FERTILITY | ||
| Menoufia Journal of Soil Science | ||
| Volume 10, Issue 11, November 2025, Pages 223-255 PDF (1.57 M) | ||
| Document Type: original papers | ||
| DOI: 10.21608/mjss.2025.430484.1039 | ||
| Authors | ||
| M. M. A. A. Zahran* 1; M. Hefzy2 | ||
| 1Researcher at Soils, Water and Environment Research Institute (SWERI), Agricultural Research Center (ARC), Giza, Egypt | ||
| 2Director of Assiut Agricultural Research Station, ARC.Associate Professor at Soil, Water and Environment Research Institute (SWERI) Asyūţ, Egypt | ||
| Abstract | ||
| Global food security is at risk because of increased environmental stress, reduced acreage, and decreased crop yields. Thus, microbial technologies are becoming vital for sustainable agriculture. There is little information about the effect of microbial gibberellic acid (GA3) and vitamins on water and onion productivity and nutrient status in soil and plants. Two field trials were carried out on a calcareous sandy soil farm during two consecutive winter seasons. Two treatments were in the main plot (without and with microbial GA3), and six were in the sub-plot (control, chemical thiamine, microbial ascorbic acid, chemical ascorbic acid microbial riboflavin, and chemical riboflavin). The data clarified that the foliar applications of microbial GA3 or vitamin treatments significantly improved onion productivity (total yield of fresh and dried bulbs, dry matter percentage, protein yield, NPK uptake) water productivity (irrigation water use efficiency and water use efficiency for total dry and fresh bulb yield) and improved or maintains soil fertility (available NPK, pH, EC and OM content) in both seasons. The biological ascorbic acid treatment performed better than the other vitamin treatments in most of the tested parameters. Foliar application of microbial GA3 plus vitamins, particularly biological ascorbic acid and biological riboflavin, resulted in a greater improvement in the parameters that were evaluated. Microbial GA₃ combined with microbial vitamins as a foliar spray is an effective, eco-friendly, and low-cost plant biostimulator that can be safely used in low-fertility soils to enhance onion yield, water productivity, and enhance or maintain soil fertility. | ||
| Keywords | ||
| Vitamin C; Vitamin B; Onion dry yield. Available nutrient. Sandy soil | ||
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