Effect of conversion from ryegrass pasture to wheat cropping on aggregation and bacterial populations in a silt loam soil in New Zealand

Ramsay, Angela J.; Stannard, Ruth E.; Churchman, G. Jock

doi:10.1071/sr9860253

Cited by 19 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In general, the introduction of plowing, plus different annual crops in these soils, decreased the incorporation of fresh residues and increased the oxidative potential of the light forms, a similar behaviour that was found by Ramsay et al (8). In the Typic Argiudoll (Azul) soil, there is an increment in the autumn-winter time, from April to August, when the soil is under highest moisture and cool conditions.…”

Section: Crop Influencementioning

confidence: 56%

Seasonal variations of the light organic fractions in soils under different agricultural management systems

Conti¹,

Palma²,

Arrigo³

et al. 1992

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

Annual dynamics of soil organic matter and seasonal evolution of total and light forms of carbon (CL) and nitrogen were studied for three series of soils in the humid Pampa of Argentina. Agricultural practice effects on the organic fraction of soil were also evaluated. Seasonal fluctuations in the light organic fractions of soils were confirmed, presenting each one of them its particular behaviour. In the Typic Argiudoll (Azul) and the Argiaguic Argialboll(Luján) persistence of CL is related to low temperaure and moisture excess.Diferences between grasses and other crops are of small importance. In the Typic Hapludoll Pehvajó, soil texture and climatological conditions favour rapid mineralization. In this case, is very important that the maintenance of light carbon incorporation be made by pastures.

show abstract

Section: Crop Influencementioning

confidence: 56%

Seasonal variations of the light organic fractions in soils under different agricultural management systems

Conti¹,

Palma²,

Arrigo³

et al. 1992

Communications in Soil Science and Plant Analysis

View full text Add to dashboard Cite

show abstract

“…Indeed, fields located at Pieve d'Olmi and Dragoni can be characterized as high‐input systems, because of the heavy use of pesticides, herbicides and fertilizers, whereas the field at S. Maria di Galeria, being an experimental field, is characterized as a low‐input system where only manure is used as fertilizer, and no pesticides or herbicides are applied. Moreover, it is well known that management practices influence microbial activities in long‐term agricultural lands (Bolton et al ., 1985; Ramsay et al ., 1986), and that diversity is generally lower in microbial communities under stress in agroecosystems (Atlas et al ., 1991; Leung et al ., 1994). Therefore, we hypothesize that the management practices applied in the fields located at Pieve d'Olmi and Dragoni may induce stress on the microbial communities and, as a consequence, reduce genomovar diversity of the B. cepacia complex in these two fields.…”

Section: Discussionmentioning

confidence: 99%

Burkholderia cepacia complex: distribution of genomovars among isolates from the maize rhizosphere in Italy

Fiore¹,

Laevens²,

Bevivino³

et al. 2001

Environmental Microbiology

View full text Add to dashboard Cite

Burkholderia cepacia is a 'complex' in which seven genomic species or genomovars have so far been identified. It appears that all seven B. cepacia genomovars are capable of causing infections in vulnerable persons; in particular, the importance of Burkholderia multivorans (genomovar II) and B. cepacia genomovar III among cystic fibrosis isolates, especially epidemic ones, has been emphasized. In order to acquire a better comprehension of the genomovar composition of environmental populations of B. cepacia, 120 strains were isolated from the rhizosphere of maize plants cultivated in fields located in northern, central and southern Italy. The identification of the different genomovars was accomplished by a combination of molecular polymerase chain reaction (PCR)-based techniques, such as restriction fragment length polymorphism (RFLP) analysis of 16S rDNA (ARDRA), genomovar-specific PCR tests and RFLP analyses based on polymorphisms in the recA gene whole-cell protein electrophoresis. ARDRA analysis allowed us to distinguish between all B. cepacia genomovars except B. cepacia genomovar I, B. cepacia genomovar III and Burkholderia ambifaria (genomovar VII). The latter genomovars were differentiated by means of recA PCR tests and RFLP analyses. Among the rhizospheric isolates of B. cepacia, we found only B. cepacia genomovar I, B. cepacia genomovar III, Burkholderia vietnamiensis (genomovar V) and B. ambifaria. B. cepacia genomovars I and III and B. ambifaria were recovered from all three fields, whereas B. vietnamiensis was detected only in the population isolated from the field located in central Italy. Among strains isolated from northern and southern Italy, the most abundant genomovars were B. ambifaria and B. cepacia genomovar III respectively; in contrast, the population isolated in central Italy showed an even distribution of strains among genomovars. These results indicate that it is not possible to differentiate clinical and environmental strains, or pathogenic and non-pathogenic strains, of the B. cepacia complex simply on the basis of genomovar status, and that the environment may serve as a reservoir for B. cepacia genomovar III infections in vulnerable humans.

show abstract

“…The effect was greater in the green manure treatment. Martynuik and Wagner (1978), Doran (1980), Bolton et al (1985), Ramsay et al (1986) and Alleoni et al (1995) also reported increases in microbial counts in response to fertilization.…”

Section: Microbial Activitymentioning

confidence: 93%

A new index to assess soil quality and sustainability of wheat-based cropping systems

et al. 2005

View full text Add to dashboard Cite

Sustainability index was calculated to assess soil quality under the influence of different fertilizer management practices. It is based on the area of the triangle in which nutrient index, microbial index and crop index of soil represented the three vertices of a triangle. Nutrient index reflected the nutrient status of soil and was calculated from the measurements of various soil chemical parameters. Microbial index was calculated by determining various soil microbial and biochemical activities and crop index by measuring of crop yield parameters. Eighteen soil indicators were determined to assess nutrient index, microbial index and crop index in order to compare the effect of different sources of nutrients such as green manure, farmyard manure and chemical fertilizer in a rice/cornwheat rotation. The indices were applied to assess the sustainability of five field experiments with respect to the different fertilizer treatments. The long-term application of organic manures in rice/corn-wheat cropping system increased the index value because it increased the nutrient index, microbial index and crop index of soils. The use of only chemical fertilizers in the rice-wheat cropping system resulted in poor soil microbial index and crop index. In corn-wheat system, additional application of FYM at 10 t ha −1 before sowing corn made the system more sustainable than application of 100%NPK; the sustainability index values were 2.43 (the highest for this system) and 0.93, respectively.

show abstract

Effect of conversion from ryegrass pasture to wheat cropping on aggregation and bacterial populations in a silt loam soil in New Zealand

Cited by 19 publications

References 22 publications

Seasonal variations of the light organic fractions in soils under different agricultural management systems

Seasonal variations of the light organic fractions in soils under different agricultural management systems

Burkholderia cepacia complex: distribution of genomovars among isolates from the maize rhizosphere in Italy

A new index to assess soil quality and sustainability of wheat-based cropping systems

Contact Info

Product

Resources

About