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Paper Information

Journal:   IRANIAN JOURNAL OF SOIL AND WATERS SCIENCES   2001 , Volume 15 , Number 2; Page(s) 0 To 0.
 
Paper: 

THE EFFECT OF ORGANIC MATTER AND MINERAL CALCIUM COMPOUNDS ON AGGREGATE SIZE DISTRIBUTION AND DISPERSIBLE CLAY IN A SODIC SOIL

 
 
Author(s):  ROUSTA M.J., GOLCHIN A., SIADAT H.
 
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Abstract: 
In a field experiment on a sodic soil in Qazvine province, the effects of different types and amounts of soil amendments were studied using a RCB design with three replicates. The treatments included: chipped wheat straw and manure at rates of 10, 20 and 40 t/ha, gypsum (equivalent to gypsum requirement) cement (5 t/ha), 20 t/ha organic matter with gypsum or with cement (5t/ha), and sulfuric acid equivalent to gypum requirement (applied through irrigation water). Aggregate stability (75-4760µm) and dispersible clay were measured one and four months after application of the amendments. One month after application of treatments, the results showed that application of 40 t/ha straw and 20 t/ha straw with cement or with gypsum increased the MWD significantly, due to increase in the abundance of > 1000 µm and >500 µm aggregates respectively.
Applicaion of manure with cement decreased the stability of different size aggregates and MWD, significantly. Also, application of 20 t/ha straw increased MWD due to increase in the abundance of aggregates >500 µm proportional to the decrease in <250 µm aggregates.The abundance of < 250 µm aggregates increased significantly upon the addition of gypsum, sulfuric acid, and manure with gypsum.
Four months after addition of the amendments, the MWD increased due to application of different rates of manure, sulfuric acid, cement, gypsum, manure with gypsum, and 40 t/ha straw, mostly due to the increase in the abundance of aggregates greater than 1000 µm.
Application of gypsum, at first, increased the abundance of <250 µm aggregates and, later, increased the abundance of >1000 µm aggregates proportional to the decrease in dispersible clay. Although the effects of different amendments on dispersible clay varied, application of gypsum, manure, and straw with gypsum decreased the dispersible clay more significantly than the other treatments. After one month, the amount of dispersible clay decreased from 89.68% in control, to 4.46%, 6.81%, and 7.63%, and after four months from 83.87% in control, to 4.23%, 1.51%, and 4.32%, respectively.
Use of sulfuric acid with irrigation water decreased the amount of dispersible clay, one and four months after acid application to, respectively, 52.55% and 19.35%,. The overall results showed the importance of organic matter addition with gypsum for the aggregate formation and stability of a sodic soil due to flocculation of dispersed clay
 
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