Evaluation of the nutritional status of roses in production fields

In northern Khuzestan, with an area of ​​245 hectares of roses, 36% of the country's cut roses are produced out of season. In order to assess the nutritional status of roses and become aware of the related problems, 34 greenhouse rose production centers were visited and water, soil, leaf, and flower samples were collected. Following that, the desired factors including chemical characteristics of irrigation water, physical and chemical characteristics of soil, leaf nutrient concentration and quality indices of roses were measured. Then, based on the quality indices of roses, the sample population was divided into two groups of high and low quality rose plantings, and the leaf nutrient concentration and quality indices of roses in both groups were statistically compared based on the t-test. The results showed that the irrigation water class used in the production fields was c2s1 and there was no problem in terms of salinity and sodium. The average electrical conductivity and pH of the soils under rose were 1.16 dS/m and 7.7, respectively. Excessive use of phosphate fertilizers has led to an increase in soil usable phosphorus to 28.2 mg/kg. While the lack of use of potash fertilizers and continuous cultivation has led to a decrease in soil usable potassium to 120 mg/kg, which has caused a decrease in the quality indicators of rose in the region. The average concentrations of available trace elements in the soil (iron, manganese, zinc, and copper) were 7.9, 4.5, 1.5, and 2.1 mg/kg of soil, respectively, all of which, except manganese, were within the desired range. The results showed that in the high quality rose planting group, leaf potassium concentration, flower fresh weight, corolla length, and corolla diameter were significantly higher at the 1% level than the values ​​of these indices in the low quality rose planting group. The concentrations of other nutrients in the two groups were not significantly different.