WATER BEHAVIOR FOR SOME WHEAT VARIETIES UNDER WATER DEFICIT CONDITIONS IN THE NORTH MIDDLE NILE DELTA REGION

Lysimeters dimensions (80 cm in width and 80 cm in length) investigation was conducted at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, during the two successive winter growing seasons 2019/2020 and 2020/2021 to investigate, the effect of water deficit conditions on yield, some yield attributes, and some water relations. A split plot design was used in this present study, where, the main plots were randomly assigned by irrigation treatments which were I1: irrigation by traditional practice as performed by farmers in the studied area, I2: irrigation by 90% from water requirements, I3: irrigation by 80% from water requirements and I4: irrigation by 70% from water requirements. While sub main plots were randomly assigned by wheat varieties which were V1: Sids -14, V2: Giza-171, V3: Gemaza-12 and V4: Misr-2.

The Main Results can be Summarized as Follows: The highest amount of seasonal applied water was recorded under irrigation treatment I1 and the value is 2100 m3/fed, the lowest value was recorded under irrigation treatment I4 and the value is 1470 m3/fed. I4 recorded the highest values for productivity of irrigation water which is (1.96 kg/m3) and as an overall average of the two seasons. The results indicated that the highest values for grain yield was recorded by irrigation treatment I3 with values of 3.96 and 3.00 ton/fed the same trend was observed for other yield attributes.