This study was conducted during the two winter seasons (2018/2019&2019/2020) to investigate the effect of NPK and compost fertilizers on the Camelina sativa plant under Egyptian ecology. The fertilizer levels of NPK were 0, 25, 50, 75 and 100%, recommended doses, whereas compost was applied at 6, 8 and 10 m 3 /fed to investigate the effect of these fertilizers and the interaction of both chemical and organic fertilizers on the vegetative growth, oil yield and oil components percentage, especially Linolenic acid (ω-3). The obtained results indicated that the application of 100% NPK as well as 10 m 3 of compost produced the highest mean values of all vegetative characteristics compared to unfertilized plants at both samples in the two growing seasons and the other treatments. On the other hand, the results showed that all NPK treatments, i.e. 25, 50, 75, and 100% NPK significantly increased seed yield (g/plant) as compared to control, the mean values were 3.06, 4.70, 9.09 and 10.20 g/plant compared to 1.84 g/plant, respectively, for the 1 st season and 3.11, 4.48, 9.27 & 10.27 g/plant comparing to 1.80 of control for the 2 nd season. Compost treatments significantly increased the seed yield; the mean values were 5.10, 5.72, 5.88 and 6.42 g/plant in the 1 st season and 5.09, 5.73, 5.99 and 6.32 g/plant in the 2 nd season for fertilization with 0, 6, 8 and 10 m 3 /Fed., respectively. The maximum mean values were obtained by compost at 10 m 3 /fed. The interaction treatment between 100% NPK and 10 m 3 /fed showed the maximum mean value of seed yield which recorded 10.51 and 10.78 g/plant for the 1 st and 2 nd seasons, respectively. In contrast, the lowest values of seed yield were obtained from unfertilized plant which recorded 1.09 and 1.04 g/plant for the 1 st and 2 nd seasons, respectively. The promising effect of NPK fertilizer on fixed oil % and yield was evident with NPK 100%, 52.53% and 52.83% fixed oil, whereas yield was 408.63 and 413.68 l/fed.), followed by 75% NPK which produced fixed oil percentage and yield 46.82, 46.77% as well as 207.29 and 208.06 l/fed for the first and second season, respectively, compared with other treatments and control. The highest fixed oil percentages and yield (l/fed) were recorded with NPK at 100% and compost at 10 m 3 /fed during both seasons.
The experimental trail was performed throughout two successive seasons (2013 and 2014) with the aim of improving growth and quality of three Hibiscus rosa-sinensis cultivars (red flowers "San Diego", yellow flowers "Butterfly" and orange flowers "Peach Schnapps"). Thus, the effect of three types of fertilization with different levels and some combinations with them, Lithovit (Nano-fertilizer), Diatoms (Algae-fertilizer) and Kristalon (NPK 19:19:19 and micro-elements) on the three cultivars were investigated in both seasons. The results emphasized that Hibiscus cv. San Diego was the best cultivar used for its superiority in producing the tallest plant, the heaviest fresh weight of vegetative growth, the highest number of flowers/plant, and the heaviest fresh weight of roots. Meanwhile Peach Schnapps cv. gave the highest number of leaves/plant, whereas, Butterfly cv. produced the highest number of branches/plant. On the other side, supplying plants with Kristalon alone or combined with fertilizers proved its superiority in improving plant parameters in most cases. The highest records of number of leaves/plant or number of branches/plant were a result of supplying plants with Kristalon at 2 g/pot. Meanwhile, the heaviest fresh weight of vegetative growth and the highest number of flowers/plant were a result of applying Kristalon at 4 g/pot. Similarly, the combination of Diatoms at 100 cm 3 /pot + Kristalon at 2 g/pot succeeded in producing the tallest plant and the highest number of branches/plant. Meanwhile, supplying plants with Diatoms at 200 cm 3 /pot was the best treatment for producing the heaviest fresh weight of roots. Chemical constituents of the plants were also affected by the different Hibiscus rosa-sinensis cultivars and fertilizer treatments. Peach Schnapps cv. recorded the highest value of N% in leaves, Butterfly cv. was the best for raising P and K% in leaves. Furthermore, the highest N% in leaves was a result of supplying plants with Diatoms at either 100 or 200 cm 3 /pot or Kristalon at 4 g/pot or the combination of Diatoms at 100 cm 3 /pot + Kristalon at 2 g/pot. Moreover, supplying plants with Diatoms at 50 or 200 cm 3 /pot or the combination of Diatoms at 100 cm 3 /pot + Kristalon at 2 g/pot caused a clear increment in P% in leaves. Meanwhile, treating plants with Lithovit at 0.5, 1.0, 1.5 g/l or Kristalon 4g/pot gave the highest values of K% in leaves. Additionally, either Hibiscus cv. Peach Schnapps or cv. San Diego were the best cultivars in raising total carbohydrates (%) in the leaves. Also, treating plants with the combination of Diatoms at 100 cm 3 /pot + Kristalon at 2 g/pot was the best treatment in raising total carbohydrates (%) in leaves. From the above outlined results it could be recommended to supply plants with Kristalon at 2 or 4 g/pot or with the combination of Diatoms at 100 cm 3 /pot + Kristalon at 2 g/pot to achieve the hope of producing Hibiscus rosa-sinensis plants with high quality.
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