Evaluate the effect of compost tea and some chelated micronutrients forms on black cumin productivity

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.