B. Soltanian; P. Rezvani Moghaddam; J. Asili
Abstract
The experiment was conducted to study the effects of water deficit stress and fertilizer sources on characteristics of Echinacea purpurea L., in a split plots design with three replications at the research farm of Faculty of Agriculture, Ferdowsi University of Mashhad, Iran during two years of 2016 and ...
Read More
The experiment was conducted to study the effects of water deficit stress and fertilizer sources on characteristics of Echinacea purpurea L., in a split plots design with three replications at the research farm of Faculty of Agriculture, Ferdowsi University of Mashhad, Iran during two years of 2016 and 2017. Irrigation consisted of three levels of non-stress (control), moderate, and severe moisture stress and fertilizer consisted of eight levels of complete fertilizer (NPK), vermicompost, humic acid, humic acid+NPK, humic acid+vermicompost, NPK+vermicompost, NPK+vermicompost+humic acid, and non-use of fertilizer (control). The single effects of deficit irrigation and fertilizer treatments were significant (p≤0.01) on the stem height, number of stems and flowers plant-1, biomass dry weight, total chlorophylls a and b, and proline content; however, their interaction effects were only significant (p≤0.01) on phenolic compounds of the leaves. In relation to the single effects of irrigation treatments, the highest height and number of stems, number of flowers plant-1, and biomass dry weight was observed in non-water stress treatments and the lowest amount of these characteristics was observed in severe water stress treatments. The highest and lowest proline content was shown in severe and non-stress treatments, respectively, and the highest and lowest total chlorophylls a and b were obtained in non-stress and severe moisture stress, respectively. Regarding the single effects of fertilizer treatments, there was no significant difference in plant height between fertilizer levels; however, all of them had a significant difference with control treatment (no fertilization). The difference between fertilizer treatments was significant in the number of stems and flowers plant-1 and biomass dry weight. The highest number of stems and flowers was obtained in humic acid+vermicompost treatment and the highest amounts of biomass dry weight were obtained in vermicompost+NPK treatment. The lowest values of these traits were observed in control (non-fertilization). The highest and lowest amounts of total chlorophylls a and b were obtained in vermicompost+NPK and control treatments, respectively, and the highest and lowest proline values were obtained in control and vermicompost treatments, respectively. The highest phenolic compounds were observed in humic acid+vermicompost+NPK and humic acid+NPK treatments, both of which under severe moisture stress, and the lowest one in non-stress and non-fertilization (control) treatment.
P. Rezvani Moghaddam; S.M. Seyedi; M. Azad
Abstract
In order to investigate the effects of organic, chemical and biological sources of nitrogen on nitrogen and fertilizer use efficiency of black seed (Nigella sativa L.), a field experiment was conducted at Agricultural Research Station of Ferdowsi University of Mashhad, Iran, in 2009-2010. The experiment ...
Read More
In order to investigate the effects of organic, chemical and biological sources of nitrogen on nitrogen and fertilizer use efficiency of black seed (Nigella sativa L.), a field experiment was conducted at Agricultural Research Station of Ferdowsi University of Mashhad, Iran, in 2009-2010. The experiment was arranged by using a completely randomized block design based on factorial fashion with three replications and twenty-five treatments. The experimental treatments included different sources of nitrogen (manure, compost, vermicompost, urea fertilizer and control) and different biological fertilizers (nitroxin including Azotobacter sp. and Azospirillum sp), mycorrhizae, nitroxin+mycorrhizae, biosulfur ((including Thiobacillus sp.) +sulfur and control (no biofertilizer). Results indicated that in spite of significant effects of sources of nitrogen and biological fertilizer on nitrogen and fertilizer use efficiency of black seed, interactions between these factors had no significant effects on mentioned traits. Results showed that nitrogen and fertilizer use efficiency of black seed in organic fertilizer treatments were significantly higher than that of urea fertilizer. The biological fertilizer had no significant increasing effects on mentioned traits, except biosulfur + sulfur bentonite. It seems that in the alkalic soils, biosulfur biofertilizer plus sulfur could contribute in increasing the nitrogen uptake and use efficiency of black seed, by decreasing the soil pH.
