Effect of different levels of nitrogen fertilizer, potassium and water on the quantitative and qualitative characteristics of roselle

halimeh piri ¹ ( zabol university )

Submited date : 2018-04-12 Accepted date : 2019-05-18

Keywords: Anthocyanin, Irrigation water use efficiency, Dry matter yield,

Abstract :

Today, changing the pattern of planting towards dehydrating plants is proposed as a solution to drought. One of the plants resistant to drought is roselle. In this research, the effects of different levels of irrigation water, nitrogen fertilizer and potassium fertilizer on roselle were investigated. The experiments were carried out in a split plot design with four levels of irrigation water depths (I1, I2, I3 and I4, respectively 25, 50, 75 and 100% of the plant water requirement) and three levels of nitrogen (N1, N2 and N3 respectively 50, 75 and 100% nitrogen) as a sub plots and three levels of potassium (K1, K2 and K3 respectively 50, 75 and 100% potassium) as subplots. At the end of the experiment, plant height, capsule weight, dry yield, anthocyanin content and irrigation water productivity were measured. The results of the experiment showed that the effects of irrigation water and potassium fertilizer were significant at 1% and 5% probability level on all measured parameters and nitrogen fertilizer on all parameters except for irrigation water productivity. The highest yield was obtained from 100% fertilizer application and 100% water requirement, but no significant effect was observed between treatment of 100 and 75% of water requirement. The highest irrigation water productivity was obtained in 75% water treatment and 100% nitrogen and potassium fertilizer application, but no significant difference was found between different treatments of nitrogen fertilizer. Therefore, considering the status of the water in the area and the reduction of water resources, the use of 75% of the water requirement will save water consumption without having a significant effect on the reduction of yield. Also, due to dry weather conditions in Sistan province, the use of potassium and nitrogen fertilizer can modify the drought stresses in roselle.