Growth and yield characteristics of roselle (Hibiscus sabdariffa L.) affected by different rates of nitrogen, phosphorus and potassium in Saravan, Iran

To study the effect of nitrogen, phosphorus, potassium different rates on some growth and yield characteristics of roselle (Hibiscus sabdariffa L.( and experiment in split-split plot experiment based on a randomized complete block design with three replications at the Shamsabad, Saravan Iran in 2012­-­2013. Main factor was potassium from sulphate potassium source in 0, 25 and 50 kg/ha as soil application in planting time. Phosphorus from triple superphosphate source in 0, 50 and 100 kg/ha assigned as sub-factor as soil application in planting time. Sub-sub factors was nitrogen from urea source including 0, 50, 100 kg/ha applied as topdress in early planting, branching and 50% flowering stages potassium. Pottasium and nitrogen fertilizer had significant effect on plant height, boll dry weight, thousand kernal weight and biomass. Also, phosphorus fertilizer had significant effect on all traits but seed number in boll and thousand kernal weight. Fertilizer interaction effected on studied traits significantly. Increasing in fertilizer rate increased most of vegetative and reproductive traits. The most biological yield and number of seed per boll were obtained in simultaneous application of all fertilizers. On the whole, in Saravan region soil and climate condition application of potassium and phosphorus fertilizer can be used in drought stress damages depression in roselle plantations.