الفهرس 
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Abstract
The present investigation was carried out at the Agricultural Research Station, Alexandria University, during the two summer seasons of 2018 and 2019. The objectives of this study included: 1- Determination of the effect of sowing date, hill spacing and zinc application levels on vegetative, yield and yield components, milling characters and chemical characteristics of rice cultivar Sakha 106. 2- Study of zinc uptake and distribution in plant parts as affected by the same factors. I Vegetative characters:
1 - Plant height(cm) The data indicated that early sowing on 10 May gave the taller plants (111.3 cm) and that character decreased significantly with delaying sowing to 20 June(95.6 cm). The data also revealed that narrow hill spacing (10 x 15) gave significantly taller plants (106.66 cm) compared to wider hill spacing (30 x 15) (103 cm). similarly, application of highest level of zinc ( 48 kg Zn/ha) resulted in taller plants (107 cm) compared to no zinc application (102.33 cm).
2- Panicle length(cm) Means in table (6) indicated that early sowing on 10 May gave the taller panicle length (20.83cm)and that character decreased significantly with delaying sowing to 20 June(18.26 cm). The data also revealed that wider hill spacing (30 x 15) gave taller panicle length (20.80 cm) compared to narrow hill spacing (10 x 15) (20.46 cm). Also, application of highest level of zinc ( 48 kg Zn/ha) gave significantly the tallest panicle length (21.10 cm) compared to no zinc application (19.0 cm).
3. Heading date(days) .
The data also revealed that early sowing on 10 May showed significantly longer period to heading (92.33 day) compared to late sowing on 20 June (85.33 day). Both increasing of hill spacing and Zn application showed insignificant differences with narrow hill spacing and no zinc application.