S.m.r. Ehteshami, M. Pourebrahimi, K. Khavazi,
Volume 4, Issue 4 (Journal of Science and Technology of Greenhouse Culture 2013)
Abstract
In order to investigate the effect of integrated management of phosphorus (P) fertilizer and phosphate solubilizing microorganisms on nutrients concentration and yield of two barley cultivars, a factorial greenhouse experiment was carried out based on randomized complete blocks design with three replications in 2011. Treatments consisted of two barley cultivars (Bahman and Fasih) and five types of P fertilizer management (seed inoculation with Pseudomonas fluorescens strain 103 + 100% recommended P fertilizer, seed inoculation with P. fluorescens strain 103 + 75% recommended P fertilizer, seed inoculation with P. fluorescens strain 103 + 50% recommended P fertilizer, seed inoculation with P. fluorescens strain 103 + no use of P fertilizer, and no inoculation and no use of P fertilizer as control). The results showed that increasing P fertilizer application increased significantly the plant height, main stem diameter, chlorophyll a and b and biological yield of the two barley cultivars. The highest main stem height, chlorophyll b content, nutrients concentration and plant dry weight was obtained at seed inoculation + 100% recommended P fertilizer treatment. Maximum stem diameter and chlorophyll a was observed at seed inoculation + 75% recommended P fertilizer. Also, Bahman cultivar had the highest forage production as compared to Fasih cultivar. According to the results, it can be stated that integrated management of growth promoting bacteria and improves yield and nutrients’ concentration.
Mohammad Pourebrahimi, Hamid Reza Roosta, Mohsen Hamidpour,
Volume 5, Issue 1 (Journal of Science and Technology of Greenhouse Culture 2014)
Abstract
In order to investigate the effect of different Fe sources on micronutrients concentration, especially Fe, in bell pepper (Capsicum annuum L. cv. California Wonder), under alkaline conditions and hydroponic system, a factorial experiment was conducted based on a completely randomized design with two factors of sodium bicarbonate (NaHCO3) at three levels (0, 10 and 15 mM) and four forms of Fe fertilizer (FeSO4, Fe-EDTA, Fe-DTPA and Fe-EDDHA) all at 10 mM and three replications. According to the obtained results, NaHCO3 stress caused a reduction in P, Fe, Mn, Zn, Cu and K, and an enhancement in Na concentration. When the FeSO4 source was used, an increase in NaHCO3 concentration resulted in severe chlorosis of the plants, although Fe concentration in this treatment not only was not lower than Fe chelate- treated plants, but also it was higher in some cases. In the presence of NaHCO3 and FeSO4 treatment, the concentration of Mn, Zn and Cu in plants was higher than in plants treated with Fe-chelates, which might be due to the reduction of Fe competition with these elements in this treatment. Therefore, although the use of Fe chelates, especially Fe-EDDHA, for Fe provision in alkaline condition is recommended, but its high concentrations may cause Mn, Zn and Cu deficiency in plants.
