Journal
AGRONOMY-BASEL
Volume 11, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/agronomy11091853
Keywords
zinc-deficient soil; Daucus carota; growth and productivity; zinc oxide nanoparticles; bulk zinc oxide; nutrient uptake
Categories
Funding
- Deanship of Scientific Research at Taif University [TURSP-2020/199]
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Foliar nourishing with zinc oxide nanoparticles (ZnO-NPs(2)) was found to be the best treatment for enhancing growth, physiology, and nutritional content of carrot plants in zinc-deficient soils, leading to increased yield.
Among the essential micronutrients, zinc (Zn) affects vital functions in crop plants. The influences of foliar nourishing with certain Zn-containing forms on the growth, productivity, and physiology of carrot plants (cv. Fire wedge F1) and their nutritional contents when grown in Zn-deficient soil were examined in both 2019/2020 and 2020/2021 field trials. Two doses of zinc oxide nanoparticles (ZnO-NPs(1) = 20 and ZnO-NPs(2) = 40 mg L-1), zinc-EDTA (Zn-EDTA(1) = 1 and Zn-EDTA(2) = 2 g L-1), or bulk zinc oxide (ZnO-B(1) = 200 and ZnO-B(2) = 400 mg L-1) were applied three times. The data outputted indicated, in general, that ZnO-NPs(2) were the best treatment that conferred more acceptable plant growth (measured as shoot length and fresh and dry weights), physiology (measured as cell membrane stability index, SPAD readings, and nutrient uptake), and nutritional homeostasis (e.g., P, Ca, Fe, Mn, Zn, and Cu contents). All these positive attributes were reflected in the highest yield, which was measured as fresh weight, dry matter, length, diameter, volume, and total yield of carrot roots. However, there were some exceptions, including the highest membrane stability index in both seasons, the highest Cu uptake and Mn content in the first season, and root fresh weight in both seasons obtained with ZnO-NPs(1). Moreover, the maximum P uptake and root dry matter were obtained with ZnO-B(1) and the highest content of root P was obtained by ZnO-B(2). Based on the above data, foliar nourishing with ZnO-NPs(2) can be recommended for the sustainability of carrot cultivation in Zn-deficient soils.
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