.Recently, micro irrigation technology has started to be applied
in irrigation of field crops in some of old lands of Egypt. Rice
(Oryza sativa, L.) is the most important crop for Egyptian food
security in spite of its traditional methods of irrigation which
needs large quantities of water to flood paddy field during
different growth stages. Therefore, to optimize crop water
productivity, this work aims to assess the effect of some drip
irrigation parameters on yield and crop water productivity of
drip irrigated paddy rice under clay soil conditions.
Field experiment was conducted to evaluate the effect of drip
irrigation emitters discharge treatments (2, 4 and 8 lh-1
) and
emitters spacing treatments (30 and 50 cm), on soil moisture
and salt distribution, plant growth parameters, yield and its
components and crop water productivity of drought-resistant
rice varieties (Oraby3). The obtained results indicated that, the
highest values of grain yield of paddy (12.54 ton.ha-1
) and crop
water productivity (1.66 kg grain.m-3
of water) were obtained
from same treatment (D4-30) of 4 lh-1 emitters discharge at 30
cm spacing between emitters on lateral lines, while highest rice
straw yield (16.06 and 16.73 ton.ha-1
) was obtained from both
(D8-30) and (D8-50),which is means that this high straw yield
comes from the treatments of higher discharge 8 lh-1 at both 30
and 50 cm spacing. So, introducing appropriate drip irrigation
system to irrigate rice crop in old land can save water and
maximize crop yield and crop water productivity.