Role of Irrigation Scheduling and Potassium Levels on the Growth and Yield of Rice (Oryza sativa L.) Anbar 33 cultivar

Abstract

A field experiment was carried out in the Agricultural Research Office fields / Al Diwaniyah Research Station in 2019 to study the role of irrigation scheduling and potassium levels in the Growth and yield of rice (Oryza sativa L.) Anbar 33 cultivar. A Factorial experiment Design in order of split plot with three replicates was used, the main plots occupied with irrigation factor (I) with four levels I1, I2, I3 and I4 representing irrigation every (1,2,3 and 4 days respectively), while the subplots occupied with potassium fertilizer factor (K) with four levels K1, K2, K3 and K4 representing (0, 60, 120 and 180 Kg k ha-1 respectively). The Results indicated that the Irrigation scheduling affected Growth and yield traits where I2 treatment was significantly superior in plant height, panicle length, panicle number, the weight of 1000 grains, grain yield and biological yield, which gave 97.3cm, 23.42cm, 100.8m2, 17.77gm, 2.86Meg ha-1 and 10.00 Meg ha-1 respectively, which did not different significantly of I1 treatment on plant height, panicle length, panicles number, grain yield and biological yield. The addition of potassium fertilizer significantly affected the studied traits, as K2 was significantly superior on panicle number, grain number/panicle, grain yield and biological yield, which gave 101.9m2, 60.58, 2.94 Mgh-1 and 9.69 Mgh-1, respectively, which did not different significantly than K4 treatment on panicles number, grain number/panicle and grain yield. The interaction indicated that there were significant differences among treatments, as I2K2 was significantly superior on panicle number, grain number/panicle, grain yield and biological yield, which gave 160.0m2, 55.00, 4.20Meg ha-1 and 13.63Meg ha-1, respectively. Keywords. Potassium fertilizer; Irrigation role; Drought tolerance Rice.