Tillage and crop succession effects on soil microbial metabolic activity and carbon utilization in a clay loam soil

SUMMARYA field study was carried out to examine the response of microbial communities of a clay loam soil to long-term (30 years) effects of residue return and fertilization. The experimental design was a split-plot arrangement of treatments, consisting of three residue treatments (crop residues returned at rates of 0, 2500 and 5000 kg/ha) in combination with eight fertilization treatments (control, no fertilizer; N, mineral nitrogen (N) fertilizer; P, mineral phosphorus (P) fertilizer; K, mineral potassium (K) fertilizer; NP, mineral NP fertilizer; NK, mineral NK fertilizer; PK, mineral PK fertilizer; and NPK, mineral NPK fertilizer). Soil microbial communities were characterized by phospholipid fatty acid analysis. Results indicated that the more crop residues were returned, the lower ratio of fungi to bacteria was observed. However, soil microbial biomass was only found to be significantly higher in plots with residues returned at a rate of 5000 kg/ha but not 2500 kg/ha. This suggested there was a threshold for microbial biomass to increase under residue return for the clay loam soil studied. The fertilization effect on soil microbial biomass gradually decreased with increases in the amount of crop residues returned. A significant composition change was observed under N fertilization. Structural equation modelling indicated that soil microbial communities were influenced directly by residue return and indirectly by residue-induced change in ratio of carbon to N and fertilization-induced change in soil pH.

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Influence of urea fertilization and urease inhibitor on the size and activity of the soil microbial biomass under conventional and zero tillage at two sites

Canadian Journal of Soil Science ◽

10.4141/s97-049 ◽

1999 ◽

Vol 79 (2) ◽

pp. 255-263 ◽

Cited By ~ 22

Author(s):

M. R. Banerjee ◽

D. L. Burton ◽

C. A. Grant

Keyword(s):

Soil Type ◽

Soil Microbial Biomass ◽

Sandy Loam ◽

Urease Inhibitor ◽

Zero Tillage ◽

Clay Loam ◽

Clay Loam Soil ◽

Tillage Systems ◽

Soil Microbial ◽

Loam Soil

Fertilizers are frequently used in agriculture to enhance crop yield and quality. Increasingly, microbial and enzyme inhibitors are being used to enhance the efficiency of fertilizer nitrogen use. The assumption being made is that the impact of these compounds is short-term or localized and thus does not adversely impact soil quality. This study investigates the implications of urea fertilizer with and without urease inhibitor [N-(n-butyl) thiophosphoric triamide, NBPT], conventional and zero tillage systems, and soil types on the soil biological characteristics including N mineralization. Microplot studies were conducted in clay loam and fine sandy loam soils in Manitoba. Soil type had a significant effect on the soil organic C but tillage did not have any significant effect. Soil microbial biomass C content ranged widely (131–1215 µg g−1 soil). The clay loam soil generally tended to contain higher biomass C than the sandy loam soil. The potential soil mineral N production (N0) was higher in clay loam soil (92.6 µg g−1 soil) than sandy loam soil (40.2 µg g−1 soil). Tillage systems, urea and urease inhibitor application had no significant impact on the soil biomass C, N0, arylsulfatase or acid and alkaline phosphatase content. At these sites considerable fluctuations occurred in the microbial and biochemical properties due to the variation of soil type. In general, these fluctuations were mainly related to soil organic matter and soil moisture content. Tillage system, urea with and without NBPT application did not contribute any notable impact on the soil biological properties reported in this study. Key words: Soil biological quality, soil type, urease inhibitor, conventional tillage, zero tillage

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Effects of Wood Amendments on the Degradation of Terbuthylazine and on Soil Microbial Community Activity in a Clay Loam Soil

Water Air & Soil Pollution ◽

10.1007/s11270-012-1289-z ◽

2012 ◽

Vol 223 (8) ◽

pp. 5401-5412 ◽

Cited By ~ 28

Author(s):

Paola Grenni ◽

M. Sonia Rodríguez-Cruz ◽

Eliseo Herrero-Hernández ◽

Jesús M. Marín-Benito ◽

Maria J. Sánchez-Martín ◽

...

Keyword(s):

Microbial Community ◽

Soil Microbial Community ◽

Clay Loam ◽

Clay Loam Soil ◽

Community Activity ◽

Soil Microbial ◽

Loam Soil

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Relationships between culturable soil microbial populations and gross nitrogen transformation processes in a clay loam soil across ecosystems

Nutrient Cycling in Agroecosystems ◽

10.1007/s10705-004-6378-y ◽

2005 ◽

Vol 71 (3) ◽

pp. 259-270 ◽

Cited By ~ 14

Author(s):

R. G. Silva ◽

E. E. Jorgensen ◽

S. M. Holub ◽

M. E. Gonsoulin

Keyword(s):

Nitrogen Transformation ◽

Microbial Populations ◽

Clay Loam ◽

Clay Loam Soil ◽

Soil Microbial ◽

Loam Soil ◽

Transformation Processes

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Effects of Cd, Zn, or both on soil microbial biomass and activity in a clay loam soil

Biology and Fertility of Soils ◽

10.1007/s00374-006-0159-5 ◽

2006 ◽

Vol 43 (6) ◽

pp. 751-758 ◽

Cited By ~ 29

Author(s):

Giancarlo Renella ◽

Amar M. Chaudri ◽

Céline M. Falloon ◽

Loretta Landi ◽

Paolo Nannipieri ◽

...

Keyword(s):

Microbial Biomass ◽

Soil Microbial Biomass ◽

Clay Loam ◽

Clay Loam Soil ◽

Soil Microbial ◽

Loam Soil

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Effect The Treatments of Biofertilizer and Mineral Fertilizer on Content of N P K of Soil Cultivated With Crop Corn (Zea Mays L).

Al-Qadisiyah Journal For Agriculture Sciences (QJAS) (P-ISSN 2077-5822 E-ISSN 2617-1479) ◽

10.33794/qjas.vol9.iss2.89 ◽

2019 ◽

Vol 9 (2) ◽

pp. 247-256

Author(s):

Mohammed Aajmi Salman ◽

Jawad A. Kamal Al-Shibani

Keyword(s):

Zea Mays ◽

Zea Mays L ◽

Mineral Fertilizer ◽

Silty Clay ◽

Clay Loam ◽

Potassium Fertilizer ◽

Clay Loam Soil ◽

Silty Clay Loam ◽

Fall Season ◽

Loam Soil

Beneficial microorganisms play a key role in the availability of ions minerals in the soil and use Randomized Complete Block Desing ( R.C.B.D ). The objective of this paper to the study effect of the of biofertilizer and miniral treatments on availability of NPK for crop corn zea mays L.Two types of biofertilizer are Bacterial Bacillus subtilis and Fungal Trichoderma harianum. Three levels of potassium fertilizer are (2.9533, 0.4000 and 2.9533). A field experiment in fall season of 2018 Has been conducted in silty clay loam soil. The experimental Results indicated that Bacillus and Trichoderma inoculation separately or together Have made a significant effect to increase in the availability of N P K in the soil compare to other treatments. The grain yield is where (2.9533, 0.4000 and 2.9533) of bacterial and fungal bio-fertilizer and potassium fertilizers respectively as compared to the control.

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