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This experiment was carried out during the two successive summer seasons of 2008 and 2009 at Private Farm in El-Mahala El-Kobra region Ghrabia Governorate, on potato plant cv. Diamant to study the effect of potassium rates ( 0,50 and 100 kg K2O/fed) and humic acid as soil application ( 0, 2 and 4 kg/fed. as humate potassium) as well as their interactions on growth, nutrition status and productivity of potato under clay soil. Application of 100 kg K2O/fed. was the superior treatment for enhancing dry weight of straw and tubers, percentage of N,P and k and total uptake by plant as well as total yield/fed. Treated of potato plants with humic acid at 4 kg/fed. gave the maximum values of plant growth and plant nutritional statues as well as yield and its components with significant differences with 2 kg / fed. with respect to N,P and K (%) and yield and its components. The best interaction treatment for increasing yield and its components was obtained by fertilization of potato plants with 100 kg K2O / fed. and treated of plants with 2 kg /fed. humic acid.

EFFECT OF POTASSIUM FERTILIZATION AND HUMIC ACID APPLICATION ON PLANT GROWTH AND PRODUCTIVITY OF POTATO PLANTS UNDER CLAY SOIL