Paper Information

Journal:   JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)   MARCH-APRIL 2012 , Volume 26 , Number 1; Page(s) 203 To 213.
 
Paper: 

STUDY ON CHANGES OF NITROGEN, PHOSPHOROUS AND POTASSIUM MACRONUTRIENTS AND MICROBIAL RESPIRATION IN AMELIORATING PROCESS OF SALINE SODIC SOIL

 
 
Author(s):  YAZDANPANAH N.*, MAHMOODABADI M.
 
* DEPARTMENT OF WATER ENGINEERING, ISLAMIC AZAD UNIVERSITY, KERMAN BRANCH
 
Abstract: 

Unfavorable fertility and microbial activity are two limitations of saline sodic soils. This study focused on variation of nitrogen, phosphorous and potassium macronutrients and microbial respiration in ameliorating process of calcareous saline sodic soil. The experiment was factorial based on CRD using 6 soil treatments consist of control, cattle manure, pistachio residue, gypsum, and their combination; 2 water treatments (with and without sulfuric acid) and 3 replicates, which was conducted in laboratory conditions by soil column. Four intermittent irrigation steps with one month intervals and one pore volume were applied. Microbial respiration was measured during leaching operations, while at the end of experiments, macronutrients concentrations of nitrogen, phosphorous and potassium were determined at different depths. The results showed that both organic matters similarly added higher amounts of nitrogen to the soil compared to control and gypsum treatments. At the end of reclamation experiments, absorbable phosphorous decreased with depth for all of the treatments except to gypsum. The results also indicated that control and gypsum had the least while pistachio treatment showed the highest efficiency in improving availability of three study macronutrients. Additionally, in comparison to the untreated irrigation water, application of sulfuric acid in conjunction with irrigation water, led to an increase in absorbable phosphorous and potassium content. Investigation of microbial respiration showed that respiration rate was lower for control while, cattle manure found to have the highest rate. The findings of this research reveal that among different amendments, pistachio residue have the highest efficiency in increasing availability of macronutrients.

 
Keyword(s): LEACHING, BIOLOGICAL ACTIVITY, CARBON MINERALIZATION, AMENDMENTS
 
References: 
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