الفهرس 
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Abstract
Objectives: Study the effect of 3 soaking periods of potato tubers (1, 2 and 3 hours) which were assigned in main plots and 5 nutreint elements (Tap water as control, nitrogen+phosphor+potassium (NPK), zinc (Zn), boron (B), and zinc+boron (Zn+B) which were allocated in sup plots
Methods & Results:
Two field experiments were conducted at Talkha district, Dakahlia Governorate, Egypt during the two seasons of 2018/2019 and 2019/2020 to evaluate the impact of soaking periods with some nutreint elements on potato (Solanum tuberosum) c.v Selani.
The experiment was done in split plot design with three replicates including 15 treatments that were the interaction between 3 soaking periods of potato tubers (1, 2 and 3 hours) which were assigned in main plots and 5 nutreint elements (Tap water as control, nitrogen+phosphor+potassium (NPK), zinc (Zn), boron (B), and zinc+boron (Zn+B) which were allocated in sup plots
The obtained results could be summarized as follows:
1-Vegetative growth characteristics:
Enhancing soaking times of potato tubers from 1hour up to 3hours enhanced plant height, No. of leaves, fresh and dry weights. The highest values of these characters obtained from soaking tubers of potato 3 hours. All nutrients application significantly enhanced plant height, No. of leaves, fresh and dry weights as compared to the control treatment. The maximum values of vegetative growth characters were obtained from soaking tubers with NPK treatment, followed by soaking with Zn+B. Soaking potato tubers before sowing 3 hours with NPK gave the maximum values of plant height, No. of leaves, fresh and dry weights, followed by soaking tubers 2 hours with NPK.
2- Chemical constituents of leaves:
Soaking tubers 3 hours before planting gave the maximum values of N, P and K percentage of leaves and tubers as well as Zn, B and Fe of leaves, followed by soaking tubers 2 hours before planting.
Application tubers with NPK before planting gave the highest contents of N, P and K of leaves and tubers. As for Zn contents of leaves, application of tubers with Zn before planting gave the highest Zn contents of leaves. As well application tubers before sowing with B gave the maximum leaves content of B, followed by application with Zn+B, while application with Zn+B gave the maximum leaves contents of Fe, followed by application with NPK. Soaking tubers 3 hours before sowing with NPK gave the maximum percentage of N, P and K of leaves and tubers, as well soaking tubers 3 hours with Zn gave the highest leaves content of Zn, in addition soaking tubers before sowing with B gave the maximum leaves content of B, while soaking tubers before sowing with Zn+B gave the highest leaves content of Fe.
3- Yield and its components:
The maximum values of average tuber weight, No of tubers/plant and total tuber yield/fed. were when soaking tubers 3 hours before sowing, followed by soaking tubers 2 hours. Application with nutrients significantly increased average tuber weight, No of tubers/plant and total tuber yield/fed. compared to the control, the maximum values were obtained from application tubers with NPK before sowing, followed by application with Zn+B. The interaction between soaking tubers 3 hours with NPK before sowing gave the highest values of average tuber weight, No of tubers/plant and total tuber yield/fed.
Conclusion:
Soaking tubers of potato before sowing 3 hours with some nutrients especially NPK vegetative growth and produced highest yield with suitable quality parameters this can reduce emergence stage and decrease days to harvest and overcome any unsuitable climate change. Hence, these treatments are recorded in order to increased head yield and quality under the conditions of this study.