Raheleh Ghale Ghafi; Hossein HajiAbaee; Fathieh Nabhani; Salvia Mohammadpour; Zahra Ardanji Kalate Siyahdasht
Abstract
This study was carried out to investigate the effect of mycorrhizal fungi (Rhizophagus irigularis) and rhizobacteria (Pseudomonas fluorescens) on maize under different fertilization conditions as greenhouse research in the Jalin region of Gorgan in 2018 during two separate experiments. The aim of the ...
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This study was carried out to investigate the effect of mycorrhizal fungi (Rhizophagus irigularis) and rhizobacteria (Pseudomonas fluorescens) on maize under different fertilization conditions as greenhouse research in the Jalin region of Gorgan in 2018 during two separate experiments. The aim of the first experiment was to compare the conventional soil incubation with seed-coating incubation, and the second experiment was to assess the growth of maize incubated with mycorrhizal fungi and plant growth-promoting rhizobacteria through seed-coating at three treatment levels of Hoagland nutrient solution (Control, 80 and 100 volumetric percentage of Hoagland solution). In both experiments, at 70 days after seed-coating, one gram of maize roots and soil attached to it were sampled and DNA was extracted from the maize rhizosphere. In the first experiment, there was no significant difference between the conventional soil incubation and seed-coating incubation according to the dry weight of stems and roots, roots’ longitudinal colonization percentage, arboscol abundance, vesicles abundance, and elements concentration. In the second experiment and under full fertilizing conditions, mycorrhizal incubation showed a significant increase in concentrations of nitrogen, phosphorus, potassium, and zinc (18.1, 3.5, 56, and 46.0 mg/kg, respectively) compared to the control (12.6, 3.1, 39.6, and 24.4 mg/kg, respectively), and the bacterial incubation showed a significant increase for magnesium, zinc, and manganese (2.0, 42.6, and 145 mg/kg, respectively) compared to the control (1.0, 24.4, and 60 mg/kg, respectively).
Yonus Mohammad Nezhad; Majid Basirat; Hossein HajiAbaee; Benjamin Torabi
Abstract
In the fields around Golestan dam, crop rotation is not performed, putting the soil fertility at risk. This experiment aims at evaluating the nutritional status of the region’s soils and determining the need for fertilizer with emphasis on macronutrients. The fertilizer requirement of these soils ...
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In the fields around Golestan dam, crop rotation is not performed, putting the soil fertility at risk. This experiment aims at evaluating the nutritional status of the region’s soils and determining the need for fertilizer with emphasis on macronutrients. The fertilizer requirement of these soils in 2017-2018 has been determined, using the QUEFTS model. At first, 30 fields in the Golestan dam region, irrigated by the dam itself, have been chosen. In each field, a small section has been selected as a non-fertilized one. All agronomic practices have been done in accordance with conventional farmers' method. From each field (fertilized and non-fertilized), five one-meter squared quadrats have been used to cut off the crop and the grain yield and non-grain yield, and measure its N, P, and K concentration. Results reveal that the mean value of N, P, and K uptake by shoots have been 54, 19.5, and 98 kg/ha, respectively, with the average grain yield being 4150 kg/ha in farmers' field. For 1000 kg of grain production per hectare, one requires 13, 4.5, and 22 kg of N, P, and K, respectively. Therefore, according to the proper validation results of the QUEFTS model, it is recommended to apply 325 kg/ha urea fertilizer, 195 kg/ha triple super phosphate fertilizer, and 60 kg/ha potassium sulfate fertilizer to produce about 5000 kg/ha wheat grain in this area.