No abstract

The effects of interaction of compost tea with chelated EDTA or humic acid micronutrients on black cumin productivity were investigated. It showed that soil drenching or foliar spray of compost tea with chelated EDTA and humic acid micronutrients increased plant height, plant dry weight, weight of seeds, oil percentage and volatile oils of seeds. Interacted compost tea significantly (p < 0.05) increased N, P and K percentage in seeds and straw and NPK uptake when interacted with humic form or with EDTA form. The N, P and K values for interacted foliar spray compost tea with humic form were 54, 21 and 30 kg/f, and with EDTA form were 39, 13 and 20 kg/f. While values for interacted soil drenching compost tea with humic form were 39, 14 and 21 kg/f, and with EDTA form were 26, 10 and 15 kg/f. The difference between drenching and foliage application of compost tea with two chelated forms was not significant (p > 0.05) in the two seasons, for plant dry weight, weight of seeds and oil percentage. However it was significant (p < 0.05) with humic form in the second season for plant height and in the first season for volatile oils percentage. Compost tea when applying in conjunction with mineral fertilizers results in high performance in the availability, uptake and accumulation of nutrient elements and leading to increasing in black cumin productivity.

Coriander is one of the most popular and intensely used spices owing to its multipurpose uses worldwide. It is mainly cultivated for the production of its dried seed and fresh leaves. The present study aimed to evaluate the application of compost and foliar spraying of TiO2 on the yield and essential oil composition of coriander. Two field experiments were conducted during two successive seasons; after that, the yield parameters were determined, and the essential oil of the seeds was extracted and analyzed via gas chromatography-mass spectrometry (GC-MS). Results indicated that coriander growths at both years were significantly affected by compost application and foliar application of TiO2, and a significant interaction of these two factors also occurred. Compost application at 50 m3 caused significant increments of 55% and 46% in umbels number and 75% and 64% in seed yield in the first and second season, respectively, compared with control. The application of compost to the coriander plant significantly influenced oil percentage and oil yield per ha. The maximum oil percent was recorded in control plants. Foliar application of TiO2 resulted in significant improvement in plant height, number of umbels, and seed yield of coriander as compared with control and reached their maximum values at 6 g L−1 compared with the control; foliar application of TiO2 at 2 g L−1 enhanced numbers of umbels by 22% with no significant differences between 2, 4, and 6 g L−1 treatments in the first season and by 24, 33, and 48% in the second season. Increases in seed yield accounted for 34, 43, and 64% in the first season and 21, 36, and 45% in the second season due to titanium dioxide application of 2, 4, and 6 g L−1, respectively. The maximum content of linalool (87.61%) and minimum content of estragole (0.7%) was recorded at 4 g L−1 titanium dioxide with no compost.

This experiment was carried out at the Shalateen station, Desert Research Center, Shalatin city-Red Sea Governorate, Egypt during the two successive seasons (2016/2017and 2017/2018) to study the effect of plants extracts (Garlic and Aloe vera) and amino acids on the vegetative growth, seed yield, oil yield and chemical constituents of Coriander plant. Results show that amino acids and/or extracts (garlic and/or aloe) stimulate and encourage of growth and yield characters of coriander plants. Also these treatments had a pronounced effect on essential oil (percentage and yield), as well as P and K%. The main constituents of essential oil under this study were linalool, p-cymene and limonene.

Governorate, to study the effect of different rates of chemical fertilization (control without fertilization, 25, 50 and 75% of recommended rates) with different levels of humic acid (0, 2 and 4 kg/feddan) and their interaction, on the growth, seed yield, active ingredient and chemical constituents of Plantago psyllium L. plants. The treatment of chemical fertilizers gave significant effect on the plant height, number of branches per plant, the fresh and dry weights per plant, seeds yield per plant and per feddan also mucilage content and percentage per plant and per feddan. The treatment of 75% from the recommended dose gave the beast result. Treatment as well as humic acid gave significant effect for data recorded and the best treatment was obtained by adding humic acid at a level of 4 kg/feddan. The obtained results indicated that the interaction between chemical fertilizers at 75% from the recommended dose combined with addition of humic acid at 4 kg/feddan gave a significant effect for all data recorded.