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Identifying Key Parameters Influencing Soil Quality at Various Depths in Tram Chim National Park, Dong Thap Province, Vietnam

Giao Nguyen Thanh, Nhien Huynh Thi Hong, Dan Truong Hoang, Ni Duong Van

Journal of Ecological Engineering

2023

Vol. 24, nr 2

81--91

This study used multivariate statistics including cluster analysis (CA) and principal component analysis (PCA) to evaluate the variability and key indicators causing changes in soil quality in Tram Chim National Park, Dong Thap province, Vietnam. Soil samples were collected in the dry season at the habitats of Ischaemum rugosum (CM), Panicum repens (CO), Nelumbo nucifera (LS), Eleocharis dulcis (NO), Oryza rufipogon (LM), Rice field (RL), Melaleuca cajuputi (T) in two layers: A (0–20 cm) and B (20–40 cm). The parameters of pH, total nitrogen (TN), total phosphorus (TP), total acidity (TA), organic matter (OM), total iron (Fe) and exchanged aluminum (Al3+) were used to assess soil quality. The results showed that soil pH was low in both A and B layers. Fe and Al were both high, and the concentrations of these metals in layer A were higher than those in layer B. The OM content was medium while the TN and TP levels were very low. Most of the soil quality indicators tended to decrease with the depth (except for TA). The results of CA analysis showed that there was almost no major change in soil quality between the two soil layers; however, the soil quality in rice field habitat was different from other habitats. The cause may be due to human impact in adding fertilizers/pesticides during farming practices. The PCA results showed at least five influencing factors, explaining 99.7% and 99.9% of soil quality variation in A and B layers. The Al3+, TA, OM, and TP parameters had the main influence on the soil quality of layer A. Meanwhile, the pH, Al3+, TA, TN, Fet indicators had influence on the soil quality of layer B. These indicators need to be future surveyed to assess the evolution of soil quality in the study area.

Discarded phosphatic slimes as fertilizer in alkaline soils

Sekhar D. M. R., Prabhulingaiah G., Dassin Y., Pillai M. G., Upadhyayula S.

Inżynieria Mineralna

2013

R. 14, nr 2

167--171

Phosphate concentrator at Eshidiya, of Jordan Phosphate Mines Co. Plc, Jordan treats two different types of ores. Both these ores are de slimed to remove clay minerals and the slimes are discarded as tailings. The discarded slimes contain P2O5 as high as 20%. Tests were conducted to use these slimes as direct P fertilizer in alkaline/saline soils both in Jordan and India. It is noted that the slimes along with N containing materials either of organic or inorganic origin work as efficiently as known phosphatic fertilizers.

Zagęszczacz fosforanowy w Eshidiya (Jordańskie Kopalnie Fosforanu) jest stosowany przez Jordanię w przypadku dwóch typów rud. Obie rudy są odszlamowane aby usunąć gliny, natomiast szlam jest odrzucany. Odrzucony szlam zawiera do 20% P2O5. Przeprowadzono testy nad wykorzystaniem tego szlamu jako głównego nawozu zawierającego fosfor w przypadku gleb zasadowych/zasolonych w Jordanii i Indiach. Należy zauważyć, że szlam wraz z materiałami zawierającymi N pochodzenia organicznego lub nieorganicznego funkcjonuje jako znany nawóz fosforowy.