الفهرس 
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Abstract
Field experiments were conducted using two green-houses at El-Bostan Experimental Station on a sand soil (89 % sand; 2 % clay) There were 2 experiments one for tomato and one for cucumber. Three sources of conditioners were tested namely: polyacrilic acid (PA), composite conditioner ( a mixture of polyacrilic acid and bentonite with a ratio of 1 : 5 by volume), (CC) and chicken manure (CH). The application rates were as follows : Soil Application rate (g/m2)
conditioners Low edium High
Polyacrilic acid - 00 - 200 300
Composite - 500 - 1000 1500
Chicken manure 2000 - 3000 6000.