Impact of irrigation with wastewaters combined with organic wastes on oil crops productivity using nuclear technique

Two field experiments were carried out as split plot based on the randomized complete blocks design with three replicates, where two irrigation treatments (treated wastewater and fresh water) were located in the main plots while the four fertilization treatments (non-fertilized, mineral (M), organic (O) and combined M+O fertilizers) were placed in the sub-plots. The irradiation treatments for canola and jatropha seeds were applied to sub- subplots. The area of each sub- subplot was 10 m² for canola and 9 m² for jatropha plants. Number of treatments =4 Multiplication Sign 2 Multiplication Sign 4 = 32. All sub- subplots received the recommended rates of P and K fertilizers during soil preparation before sowing. In case of N fertilization, all plants received 150 and 100 kg ha^-1 for respective canola and jatropha plants in three different forms: 100% compost (100% organic N, F_o), 100% ammonium sulphate (100% mineral-N, F_M), 50% ammonium sulphate +50% compost (50% organic-N+50% mineral-N, F_M+O) in addition to the non-fertilized control treatment (F₀). In this concern, compost was added during soil preparation, while the ammonium sulphate fertilizer was added in splitting three equal doses i.e. during seed cultivation, 30 days and 51 days after seed planting, respectively. Tested plants were irrigated with either fresh water or treated wastewater every 21 days using a drip irrigation system. After 140 days from cultivation, canola plants were harvested from each sub-subplot, while jatropha plants were harvested after 2 years in 2017.