id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
biotropia-736	Chung, Nguyen Tan; Chung, Sy Danh; Thoi, Hoang Van	BIOCHEMICAL CHARACTERISTICS OF THIONIC FLUVISOL LINKED TO LAND USE TYPES IN SOUTHERN VIETNAM	2017	16	.pdf	application/pdf	9360	396	65	Tran et al. (2011) showed concentrations of exchangeable Fe ions were seasonally fluctuated in layer O, which could reach a peak of 11,780 mg/kg at the beginning of the rainy season, but dramatically decreased to 521 mg/kg at the end of 3+the rainy season while Al concentration greatly varied among soil layers, fluctuated from 0 to 749 mg/kg in soil layer A and 104 to 1,109 mg/kg soil in soil layer Cp. 3+ 3+ 2-Contents of Al , Fe , SO and other 4 nutrients in acid sulfate soil greatly vary among soil layers and seasons (Le et al. 2000; Le 2003).	cache/biotropia-736.pdf	txt/biotropia-736.txt