The Role of New Transformants Phosphate Bio-Stimulates (PBS) Bacteria Inoculates on Growth, Yield and Quality of Kohlrabi Plants

Abstract

Producing new transformants phosphate bio-stimulate (PBS) bacterial inoculates in addition to study their potential effect on growth, yield and quality of kohlrabi plants at two successive seasons 2017/2018 and 2018/2019 were studied in this present work. The obtained results revealed that using the three tested phosphate bio-stimulate inoculates (PBS1, PBS2 and PBS3) alone or combined with different doses of phosphate mineral fertilizer PMF (calcium superphosphate) increase considerably growth, yield and quality of kohlrabi plants as compared to control. Among all tested PBS inoculates treatments, plants treated with PBS2 was superior and gave the best results in all studied traits when used alone or in combination with PMF doses at both seasons. Applying PBS (1,2 and 3) inoculates alone or combined with PMF doses improved the quality of kohlrabi knobs by increasing the values of total soluble solid TSS%, carbohydrates% and Lascorbic acid% content in the same time, it decreased significantly the fiber% and nitrate content in knob as compared to the control in both seasons. So it could be recommended that to reduce the actual hazard of mineral fertilizer on soil and human health and to produce safe and healthy vegetable for local market and exportation it should be used PBS inoculates alone or combined with low PMF doses.

Plant Growth Promoting Bacteria for Aquaponics as a New Strategy That Grants Quality and Nutrient Efficiency in Kohlrabi Cultivation

“…However, in the case of inoculation with bacteria, both B1 and B2 combined with the mixed water + S treatment increased the absorption of all macronutrients, equaling, in most cases, the values of control plants (Table 3). These findings are in harmony with those reported by Soltan et al [1], who observed increases in N, P, K, and Mg, as the bacteria increased the availability of nutrients required by the plants. The nutritional effect of Pantoea can be ignored, as it does not affect the absorption of N and P [8].…”

“…Among the species that are part of the Brassicaceae family, we find kohlrabi (Brassica oleracea var. gongylodes), which has a short growing period in early summer and autumn [1]. The most consumed part of kohlrabi is the fleshy, swollen stem (bulb), which can be eaten raw, cooked, or preserved.…”

“…The most consumed part of kohlrabi is the fleshy, swollen stem (bulb), which can be eaten raw, cooked, or preserved. However, the young leaves can also be consumed in salads or cooked as spinach, so they can be another added product for producers and consumers [1,2]. This vegetable has a high nutritional value for humans since it is a source of antioxidants such as vitamin C, phenolic compounds, glucosinolates, and nutrients such as potassium [3], which grant them antioxidant, anti-inflammatory, and anti-cancer properties [1].…”

“…However, the young leaves can also be consumed in salads or cooked as spinach, so they can be another added product for producers and consumers [1,2]. This vegetable has a high nutritional value for humans since it is a source of antioxidants such as vitamin C, phenolic compounds, glucosinolates, and nutrients such as potassium [3], which grant them antioxidant, anti-inflammatory, and anti-cancer properties [1]. Kohlrabi is available in white, green, and purple varieties, and it has been observed that the latter have antioxidant properties due to the pigments responsible for their color [4].…”

Plant Growth-Promoting Rhizobacteria as Tools to Improve the Growth of Kohlrabi (Brassica oleracea var. gongylodes) Plants in an Aquaponics System

“…To do this, this study will be carried out on kohlrabi plants, which belong to the Brassicaceae family. It is a vegetable with great nutritional value due to its high content of antioxidants such as vitamin C, glucosinolates, phenolic compounds and nutrients such as potassium, which have anti-inflammatory, antioxidant and anti-cancer properties [ 13 ].…”