The limitation of water resources and remarkable increase in population should force research workers to find ways for saving water without significant reduction in yield. So, two field experiments were carried out at Water Management Research Station, El-Karda and Irrigation Development Area at El-Wazaria, Kafrelsheikh, Egypt, during the two growing seasons of 2013/14 and 2014/15 to study the mutual effect of withholding irrigation and potassium fertilizer on yield and water productivity of wheat. Split plot design with four replicates was used. The main plots were devoted to irrigation treatments while the subplots were assigned to potassium fertilizer. Irrigation treatments were full irrigation (W 1) including tillering (T), Jointing (J) , booting (B), heading (H) and milking (M) stage, and it has been added to a 60 cm of the root zone depth; full irrigation (W 2) including T,J,B, H and M stages, and it has been added to a 40 cm of the root zone depth; withholding irrigation (W 3) at M stage; withholding irrigation (W 4) at B stage; withholding (W 5) at J stage; withholding (W 6) at J and B stages and withholding (W 7) at J,B and M stages. All withholding irrigation treatments were irrigated to a 40 cm of the root zone depth. Potassium application treatments were 24 kg K 2 O feddan as basil along with foliar spraying twice using 2 % of potassium sulphate at 35 and 55 days after sowing and control treatment without application. Results showed that insignificant increases between full irrigation treatments of W 1 and W 2 in spike No. m-2 , spike length, kernel No. spike-1 , 1000-kernel weight, grain weight spike-1 , straw and grain yields in both seasons .No significant differences in the most of these traits were noticed among withholding irrigation treatments of W 3 , W 4 and W 5 that received four irrigation and W 1 especially in the first season that receive irrigation twice because of high rainfall.

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HE MAIZE (Zea mays L.) was grown on a clay soil at Irrigation ……Development Area of Alwezaria, Kafr El-Shiekh, Egypt, during 2012 and 2013 seasons, to study the effect of irrigation regimes during different growth stages on growth, grain yield and water relations. Irrigation was applied at 50% (high level, H) and 65% (low level, L) depletion of available soil moisture (DAM) during different growth stages [vegetative stage (S 1) from the third leaf (V3) to onset tasseling (VT) stages, reproductive stage I (S 2) from VT to mid-milk (R3) stages, reproductive stage II (S 3) from mid R3 to physiological maturity (R6)]. H.S. GHARIB et al.

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