الفهرس 
Fertilizer requirements of jatropha curcas l. plant irrigated with sewage effluents
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Abstract
Jatropha curcas L. (J. curcas) plant is a promising crop for biofuel production. In Egypt, more than 90% of the total land area is marginal desert land. Currently, Egypt is suffering from a shortage of available water resources. Seed oils of J. curcas are non-edible. Therefore, a field trial was conducted at the farm attached to Waste Water Treatment Plant located at Abu Rawash, Giza Governorate, Egypt. The trial was for consecutive two years (2013-2014 and 2014-2015) in three years old J. curcas plantations raised at a net area (2m{u00D7}3m)/plant in sandy soil using sewage effluents for irrigation. The experimental design was split split plot design included three factors: the main factor was for potassium (K) and the sub-main factor was for phosphorus (P) while the sub-sub-main factor was for nitrogen (N).The treatments were comprised of three rates of (K) were applied as K₂SO₄ (50 % K₂O): 0.0, 30, and 60 g K₂O/plant, four rates of (P) were added as single super phosphate (15 % P₂O₅): 0.0, 50, 100, and 200 g P₂O₅/plant and four rates of (N) were applied as (NH₄)₂SO₄ (20% N): 0.0, 25, 50 and 100 g N/plant. The effect of N, P, and K rates on seed yield, oil content, oil yield and oil fatty acids composition of J. curcas was evaluated. Under irrigation with sewage effluents, the results in both years showed that; mean seed yield decreased gradually and with significant due to applications of K also, it decreased gradually and significantly with P applications so, the control treatment of both P0 and K0 were superior. In contrast, N application increased seed yield gradually and significantly up to 100 g N/plant. Interestingly, two-way interactions were significant and three-way interactions followed the same trend, the treatment K0P0N100 was the superior treatment in mean seed yield that resulted in (1.08 and 1.70 T/Feddan) or (2.56 and 4.05 T/ha) in the 1st and 2nd year, respectively