Six separate field trials were conducted at Shandaweel Agric. Res. Station (Sohag governorate), Egypt in 2012 and repeated in 2013 seasons to study the effect of a new irrigation method with NPK rates and frequencies under two planting dates on yield and yield component of Egyptian cotton variety Giza-90. The field trails included seventy two treatments represented the combination between two planting dates (20thMarch and 20thApril), three irrigation patterns; Alternate furrow irrigation (AFI), Fixed two furrow irrigation (FFI) and Conventional furrow irrigation (CFI)), three NPK rates (75, 100 and 125%from the recommended fertilizer levels) and four splitting of NPK (Two, Three, Four and Five equal parts).The obtained results revealed that sowing dates affected significantly all studied characters due to the variation in total amount of heat units in each date. Early planting date in March increased yield and its component (number of sympodia branches/ plant, number of open boll/ plant, boll weight, seed cotton yields/ plant and fed.) in both seasons. In the first season, a new irrigation method, i.e. alternative irrigation system resulted the high mean values for number of sympodia / plant, number of open boll, boll weight, yields per plant and per fed.in the first planting date, but in the second date recorded high mean values for number of open boll and yield per plant. Moreover, in the second season appearance high mean values for number of open boll in the first planting date and number of sympodia/ plant, number of open boll and seed cotton yield per plant in the second planting date. Application of NPK fertilizer up to high rate 125% from the recommended NPK/fed. significantly increased number of sympodia/ plant, boll weight and seed cotton yield per fed. under the two planting dates in both season. On the other hand, 100 % from the recommended NPK/fed. recorded high mean values for number of open boll and seed cotton yield per plant in the both seasons for each planting date. Splitting fertilizers five times led to increase the number of sympodia / plant, boll weight and seed cotton yield per fed. in the first planting date for 2012 and 2013 seasons as well as, number of sympodia/ plant, seed cotton yield per fed. and number of sympodia/ plant, number of open boll in 2012 and 2013 seasons respectively, for the second planting date compared with the other treatments.