We present the diversity of Asteraceae in Arequipa Region southern Peru, an area strongly influenced by volcanism, which has given rise to different soil types and determined a very wide bioclimatic vegetational zonation. distribution endemisms Peru Arequipa, dry puna. For this purpose, we have used methodology Rivas-Martínez, characteristic soils each collection point, distance localities from...

The study area is located within two regions. first site in Tikrit city (Tikrit University) represents gypsiferous soils and the second calcareous Erbil Governorate. Two pedons were chosen P1 (rainfed) P2 (cultivated), other P3 P4 ( cultivated) . showed presence of gypsum crystals spindle lenticular type with a length ranging between (0.2 -0.5) mm , pores vughs chamber, while dominance planer i...

Three pedons were selected representing the soil series of study area in Baiji city, which are Khadraniya, Al-Sharqat, and Manjour soils series, calcareous gypsiferous soils, to diagnose some micro-morphological Features horizons. Pedons morphologically described, disturbed undisturbed samples collected from each horizon. The presence (calcic) (gypsic) horizons has been diagnostic by morphologi...

soils of the arid–semiarid karaj basin in north-central iran have formed on alluvium-colluvium derived from mixed calcareous-gypsiferous marls of miocene and basic igneous rocks of holocene age. in order to characterize and classify the soils and to determine the soil-landscape relationship in the area, sixteen pedons located on different physiographic positions have been described, sampled and...

This study includes the effect of lime addition on engineering properties gypseous soil taken from a part Najaf- Karbla plateau (52, 48, 72% gypsum). Also this shows increase in proportion gypsum northwest direction area. Maximum dry density and optimum moisture content (2.065, 2.025 2.003) at 15%, 14% 15% respectively for three samples. The maximum decrease while increases with increasing rati...