Use of humic substances as soil conditioners to increase aggregate stability

被引:177
作者
Piccolo, A [1 ]
Pietramellara, G [1 ]
Mbagwu, JSC [1 ]
机构
[1] UNIV NIGERIA, DEPT SOIL SCI, NSUKKA, NIGERIA
关键词
exogenous humic substances; soil conditioners; soil physical properties; Italy; soil structure; wetting/drying cycles;
D O I
10.1016/S0016-7061(96)00092-4
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
In many agricultural soils in the semi-arid and arid mediterranean climates: exposure to cyclic wetting and drying (WD) can reduce aggregate stability. The extent to which soil pretreatment with coal-derived humic substances (HS) can increase aggregate stability in soils exposed to cyclic wetting and drying (WD) was evaluated in this study. The soils studied are an Acireale silty clay loam from Sicily, a Principina silt loam from Tuscany and a Bovolone loam from Venetia in Italy. On each soil right rates of the HS (0, 0.001, 0.01, 0.05, 0.10, 0.50, 1.00 and 10.00 g/kg of soil) and four WD cycles (0, 3, 6 and 9) were used to assess any changes in Stability. On the Principina and Bovolone soils dominated by illitic and smectic clay minerals, successive WD cycles reduced aggregate stability. On the Acireale soil, dominated by kaolinitic clay mineral, after initial decrease in stability following three WD cycles, the aggregates regained stability as cyclic WD continued. Amending the soils with low rates of HS (equivalent to 100-200 kg/ha) not only improved aggregate stability significantly (p = 0.05) on all the three soils, but also reduced substantially the disaggregating effects of WD cycles. This work indicates that exogenous humic substances have a potential as soil conditioners in conservation practices aimed at increasing the structural stability of soils.
引用
收藏
页码:267 / 277
页数:11
相关论文
共 33 条
[21]   EFFECTS OF DIFFERENT ORGANIC WASTE AMENDMENTS ON SOIL MICROAGGREGATES STABILITY AND MOLECULAR SIZES OF HUMIC SUBSTANCES [J].
PICCOLO, A ;
MBAGWU, JSC .
PLANT AND SOIL, 1990, 123 (01) :27-37
[22]   HUMIC SUBSTANCES AND SURFACTANTS EFFECTS ON THE STABILITY OF 2 TROPICAL SOILS [J].
PICCOLO, A ;
MBAGWU, JSC .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1994, 58 (03) :950-955
[23]   C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTRA OF SOIL HUMIC SUBSTANCES EXTRACTED BY DIFFERENT MECHANISMS [J].
PICCOLO, A ;
CAMPANELLA, L ;
PETRONIO, BM .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1990, 54 (03) :750-756
[24]  
Piccolo A., 1996, Humic substances in terrestrial ecosystems, P225, DOI DOI 10.1016/B978-044481516-3/50006-2
[25]  
RAUSA R, 1989, P INT C COAL SCI TOK, V1, P237
[26]  
Rhoades J. D., 1982, Methods of soil analysis. Part 2. Chemical and microbiological properties, P149
[27]   THE EFFECT OF SUCCESSIVE WET DRY CYCLES ON AGGREGATE SIZE DISTRIBUTION IN A CLAY TEXTURE SOIL [J].
SHIEL, RS ;
ADEY, MA ;
LODDER, M .
JOURNAL OF SOIL SCIENCE, 1988, 39 (01) :71-80
[28]   STABILITY OF SYNTHETIC SAND CLAY AGGREGATES AFTER WETTING AND DRYING CYCLES [J].
SINGER, MJ ;
SOUTHARD, RJ ;
WARRINGTON, DN ;
JANITZKY, P .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1992, 56 (06) :1843-1848
[29]   TIME FOR YET ANOTHER LOOK AT SOIL CONDITIONERS [J].
SOJKA, RE ;
LENTZ, RD .
SOIL SCIENCE, 1994, 158 (04) :233-234
[30]   CLAY-POLYMER INTERACTIONS - SUMMARY AND PERSPECTIVES [J].
THENG, BKG .
CLAYS AND CLAY MINERALS, 1982, 30 (01) :1-10