EFFECT OF DIFFERENT IRRIGATION INTERVALS AND TREATMENTS ON YIELD QUANTITY AND QUALITY OF POTATO (SOLANUM TUBEROSUM L.) UNDER FIELD CONDITIONS IN SULAIMANI, IRAQI KURDISTAN REGION

This study was carried out in two growing spring seasons 2017 and 2018 at Kanipanka Agricultural Research Station (Lat. 35 degrees 13'12 '', Long. 45 degrees 25'48 '', 550 MASL) in Shahrazoor valley 35 km east of Sulaimani The aim was to investigate the effect of two irrigation intervals (5 and 10 days) and thirteen biotic and abiotic treatments on yield quantity and quality of potato under field condition. The results showed that the 5 days irrigation intervals gave the maximum values of total yield, Total Soluble Solute percentage, while 10 days of irrigation intervals obtained the highest values of tuber hardness and all of the amino acids in the tuber seasons 2017 and 2018, while the maximum values of total yield were acquired through mycorrhizal inoculation. Total Soluble Solute and tuber hardness were achieved by potassium chloride treatment. Whereas the maximum values of all amino acid in the tuber were given by the mycorrhizal inoculation treatment with (6 g L-1) of Glycyrrhiza glabra extract in the first season 2017. Concerning the second season 2018, the maximum total yield gave by treatment of potassium chloride and (6 g L-1) of Glycyrrhiza glabra extract, while the potassium chloride treatment gave the maximum values of Total Soluble Solute in the tuber.