Carbon and N mineralization as affected by soil cultivation and crop residue in a calcareous wetland ecosystem in Central Iran

Raiesi, Fayez

doi:10.1016/j.agee.2005.07.002

Cited by 126 publications

(68 citation statements)

References 44 publications

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“…It is undeniable that a higher accumulation of N in leaves of wheat plants that accompanied the increase in soil N could be attributed to the higher N content of alfalfa residues than by other residues (N content in alfalfa was 2.3%) (Figure 3). This is in agreement with results obtained by Raiesi [50] who reported that wheat and alfalfa residues showed significant differences in most litter quality parameters as well as in C and N turnover rates. Plant residues with a higher quality (high N contents; low lignin, cellulose and polyphenol contents; low ratios of C/N and lignin/N) often show high decomposition and N mineralization rates.…”

Section: Resultssupporting

confidence: 83%

The Effect of Crop Residues on Soil Nitrogen Dynamics and Wheat Yield

Kamkar¹

2014

APAR

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Section: Resultssupporting

confidence: 83%

The Effect of Crop Residues on Soil Nitrogen Dynamics and Wheat Yield

Kamkar¹

2014

APAR

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“…Matus et al, [21], observed that soil organic carbon tends to be associated with the fine fraction of soils and it was significantly three times in clay-rich soils than coarse soils. Fine texture soil shows more stable aggregates, which in turn may act as a media of greater amount of organic carbon and total nitrogen contents [22].…”

Section: Resultsmentioning

confidence: 99%

Effect of Soil Physico-Chemical Properties and Plant Type on Bacterial Diversity in Semi-Arid Parts in Central Sudan. Part I: Omdurman North Region

Hassan¹,

EL-Kamali²

2015

OALib

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Bacterial diversity and total viable counts of bacteria of the different soil samples from two different localities in Omdurman north region-Karary and Khor Omer sub-regions-were carried out. Soil physical and chemical characteristics (pH, EC, SP, solublecations: Na, K, Ca, Mg and anion P, organic carbon, total nitrogen and soil texture) in each studied sub-regions were measured. Qualitative analysis of microorganisms isolated from the studied soil samples reveals a total of more than eight different species of bacteria, of which two are unidentified. The six species are classified under Bacillus genera. In Omdurman north region soil samples, total bacterial counts ranged from 7.5 × 10 3 cfu•g −1 to 1 × 10 4 with a mean of 4 × 10 4 cfu•g −1 . The quantitative data on microbial population recorded in the present study were analysed using two diversity indices. High Shannon-Weiner diversity index value for bacteria was obtained in Khor Omer sub-region (1.71261). Actinomyces spp. and Streptomyces spp. were the most abundant microorganisms identified in the two sub-regions. Total bacterial count in Karary soil was positively correlated with EC (r = 0.3868), clay (r = 0.1412), sand (r = 0.5891) and K (r = 0.0265) and negatively correlated with pH, silt, SP, Na, P, Ca, Mg, N and OC whereas the total bacterial count in Khor Omer soil was positively correlated with EC (r = 0.3973), clay (r = 0.1966), silt (r = 0.2116), Ca (r = 0.6733), Mg (r = 0.586) and OC (r = 0.2368) and negatively correlated with pH, sand, SP, Na, K, P and N. There were obvious differences in correlation coefficients among the selected criteria (37% of the total number of correlation coefficients were positively correlated between bacterial counts and soil physico-chemical properties whereas 63% of the total number were positively correlated between plant type and bacterial counts). The formulation of an appropriate national strategy in biotechnology should constitute an important, initial step towards the utilization and industrialization of microorganisms. The development of molecular techniques of microbial identification, coupled with traditional methods is promising areas for continued research.

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“…Positive effects of human activities on soil quality Incorporation of crop residues usually improves SOM and TN directly, and induces accumulation of C and N (Rasmussen & Parton 1994;Fischer et al 2002;Karlen et al 2006;Raiesi 2006;Huang et al 2007). Land use change from dry land to rice paddies also usually improves soil quality (Bhandari et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Email: yanbing_qi@sina.com land agriculture to rice paddy production have improved soil quality (Rasmussen & Parton 1994;Fischer et al 2002;Karlen et al 2006;Raiesi 2006;Huang et al 2007). These factors are accelerating changes in soil properties, both directly and indirectly, to the degree that new trends reveal that human-induced variation of soil properties has surpassed natural variation (David et al 2001).…”

Section: Introductionmentioning

confidence: 99%