Effect of Plant Spacing on the Productivity of Roselle (Hibiscus sabdariffa L.) Grown in Newly Reclamed Land

Abstract

Plan: spacing study has been conducted on two types of Roselle, namely Hibiscus sabdariffa var. Masrt, and H. sabdariffa var. Sudani. The two types are traditionally used to be cultivated in Egypt in loamy rich soils at a distance of 60 to 70 cm between hills. In the present experiment, however, they were cultivated in a newly reclamed desert land. The spacing treatments were 30, 50 and 70 cm between hills. The results revealed that the wider spacing (70 cm) resulted in shorter plants with more branches and higher number of fruits per plant. However, the narrower spacing (30 cm) gave higher weight of fruits, fresh sepals and accordingly, higher yields of dry sepals, anthocyanins and acids compared with the treatment of 70 cm. The best results concerning the yield of sepals and active constituents per unit area were gamed when Roselle plants were planted at 50 cm spacing. The spacing; treatments did not affect the content of anthocyanins or total acidity as a percentage.

Sowing date as a determining factor for Roselle, Hibiscus sabdariffa, production: I. Effect on vegetative and yield components

“…They added that sowing at the mid July significantly had more productivity compared to the other planting dates. These results were in agree also with those of [25,26].…”

Effect of Sowing Time and Plant Density on the Growth and Production of Roselle (Hibiscus sabdariffa)

“…The variation in stem diameter might be due to the effect of planting density on the inter-plants competition for nutrients, lights and other important growth factors, which cause variation in stem diameter (Brown, 1984). Shalaby and Razin (1989) also observed maximum stem diameter at lowest plant density at 70 cm spacing.…”

“…As the plant leaves are transparent to FR radiation (700-800 nm wavelength) and partially filter the visible radiation (light i.e., 400-700 nm wavelength) including red light (600-700 nm wavelength), the results in reducing the R:FR ratio, thereby increasing the plant height. McLaren and Smith (1978) and Shalaby and Razin (1989), observed that red light interception caused low R:FR and consequently increased plant height.…”

Genetic diversity, variability and characterization of the agro-morphological traits of Northern Ghana Roselle (Hibiscus sabdariffa var. altissima) accessions

“…In addition, few reports have confirmed that wider plant spacing of 50 to 80 cm in roselle (var. sabdariffa) increased branching and reduced plant height (Okosun et al, 2006;Shalaby and Razin, 1989).…”