Drip fertigation of some vegetable crops grown on ahariya oasis soil

pot experiment was carried out to study the suitability of Bahanya Oasis soils for producing vegetable crops under drip fertigation system. Three factors were arranged (crop kinds, lettuce, onion and pea ; Organic fertilization, unfertilized and fertilized with farmyard manure; NPK levels, without NPK, 50%, 100% and 150% of recommended dose) in randomized complete block design with three replicates. Organic matter fertilization increased shoot dry ,under 0.0 organic addition shoot dry weight were increased with increasing mineral fertilization The same trend was also, obtained under organic fertilization condition but with a lower rate of increase. Under 100% of mineral recommended dose, organic fertilization increased lettuce and onion nitrogen content of shoots and the lowest increase was achieved in pea shoot nitrogen content. It is worthy to note that, in general nitrogen concentrations in roots are very low comparing to its content in shoots. Phosphorus concentration of organic fertilized lettuce, onion and pea shoots, respectively. Mineral fertilization increased phosphorus content of the studied crops even with addition of organic fertilizer up to the highest level and its effect was abundant under 0.0 organic fertilizer treatments. Organic matter addition increased potassium concentration in lettuce shoot, onion shoots and pea shoots, respectively compared with 0.0 organic manure additions. So both mineral fertilization with organic manure and without organic manure increased potassium concentration in lettuce shoot, onion shoots and pea shoots to a large extent. Little effect was found on potassium concentration of roots due to organic manure addition, where organic fertilized lettuce, onion and pea treatments mean is much dosed to that of unfertilized one. Utilization rate of applied nitrogen, respectively. Nitrogen utilization was increased with a lower rate in absence of organic matter. Utilization rate of applied phosphorus was increased (mineral fertilization treatments mean), due to organic matter addition to lettuce, onion and pea, respectively.