الفهرس 
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Abstract
Two field experiments were carried out at the Vegetable Crops Farm in Baramoon Research Station, Mansoura, Dakahlia governorate, Egypt, during the winter season of 2017-2018 and 2018-2019, to investigate the effect of irrigation intervals under different sources of potassium (mineral + natural + bio) combined with foliar application nano-K fertilizer (K nano particles) on plant growth and productivity of garlic Chinese cv (Allium sativum L.). The experiment includes 42 treatments which arranged in strip-split block design with 3 replicates, as the interactions between three irrigation intervals (14, 21 and 28 days) as vertical plots, seven sources of potassium fertilization (100 % K-mineral (150 kg potassium sulphate /fed.), 100% K-biofertilizer (1 L Potassium Silicate dissolving bacteria/fed., Bacillus circulans), 100 % K-natural (700 kg feldspar/fed.), 50 % K- mineral +50 % K-biofertilizer, 50 % K- mineral +50 % K-natural, 50 % K-natural + 50 % K-biofertilizer and 33 % K- mineral +33 % K-natural + 33 % K-biofertilizer) as horizontal plots and two foliar applications (with nano-K, 3000 ppm) and without) as split plots. Obtained results indicated that, the fertilization of garlic plants with different sources of potassium as 33 % K- mineral +33 % K-natural +33% K-biofertilizer showed the best vegetative growth parameters and the highset yield productivity followed by the treatment of 50 % K-natural + 50 % K-biofertilizer with foliar application by 3000 ppm nano-K particles under irrigation every 21 days under the same conditions of the experiment.