scholarly journals Seasonal and fertiliser effects on microbial phosphorus and nitrogen in soils under pasture

1990 ◽  
pp. 195-198
Author(s):  
K.W. Perrott ◽  
S.U. Sarathchandra
Keyword(s):  
Microbial Biomass ◽  
Seasonal Pattern ◽  
Nutrient Deficiency ◽  
Field Trials ◽  
Seasonal Effects ◽  
Pasture Production ◽  
Soil Microbial ◽  
Climatic Variations ◽  
Microbial Nitrogen ◽  
Microbial P

Significant quantities of phosphorus (P) and nitrogen (N) are present in the soil microbes compared with pasture requirements for these nutrients. Seasonal and fertiliser effects on microbial P and N were investigated in a controlled environment (CE) experiment, two field trials and a glasshouse trial. In the CE experiment there was a basic seasonal pattern of storage of P and N by the microbial biomass over "winter" and release of these nutrients in "spring". Climatic variations affected this pattern in the field trials. Withholding fertiliser did not affect soil microbial P and N in the field trials, despite a decline in pasture production of up to 20%. Soil microbial P and N did decline in the glasshouse trial, in which a much larger drop in herbage production (X30%) was induced by nutrient deficiency. Keywords soil microbial biomass, microbial phosphorus, microbial nitrogen, seasonal effects, withholding fertiliser, plant nutrients

Seasonal and fertilizer effects on the organic cycle and microbial biomass in a hill country soil under pasture

Soil Research ◽  
1992 ◽  
Vol 30 (3) ◽  
pp. 383 ◽  
Author(s):  
KW Perrott ◽  
SU Sarathchandra ◽  
BW Dow
Keyword(s):  
Microbial Biomass ◽  
Sodium Bicarbonate ◽  
Organic Phosphorus ◽  
Soil Phosphorus ◽  
Phosphorus Uptake ◽  
Phosphate Fertilizer ◽  
Inorganic Phosphorus ◽  
Pasture Production ◽  
Hill Country ◽  
Soil Microbial

A two year investigation of soil phosphorus and the soil organic cycle was carried out on a typical hill country site in the North Island, New Zealand. This included investigation of changes in soil phosphorus, as well as seasonal and fertilizer (superphosphate) effects on soil microbial phosphorus and sulfur, sodium bicarbonate extractable phosphorus and calcium chloride extractable sulfur. No net utilization of soil organic phosphorus occurred when application of phosphate fertilizer was withheld. On the contrary, accumulation of organic phosphorus was found in both fertilized and unfertilized plots. Immobilization of inorganic phosphorus into organic forms appeared to be a significant factor in fertilizer phosphorus requirements at this site. It was also a significant cause of the decline in the soil phosphorus status when no fertilizer was applied. Despite declining pasture production, there were no effects of withholding superphosphate on the soil biological cycle as measured by soil microbial phosphorus and sulfur, total organic phosphorus and sodium bicarbonate extractable organic phosphorus. However, seasonal variations occurred indicating storage and release of phosphorus by the soil organic matter and microbial biomass. Release of phosphorus occurred during periods of rapid pasture growth and could account for phosphorus uptake by the pasture at those times.

The relative contribution of plant residues and fertilizer to the phosphorus nutrition of wheat in a pasture cereal system

Soil Research ◽  
1986 ◽  
Vol 24 (4) ◽  
pp. 517 ◽  
Author(s):  
MJ Mclaughlin ◽  
AM Alston
Keyword(s):  
Microbial Biomass ◽  
Wheat Plant ◽  
Dry Weight ◽  
Plant Residues ◽  
Soil Microbial ◽  
Relative Contribution ◽  
Medicago Trunculata ◽  
Microbial P ◽  
32P Uptake ◽  
Total P

Wheat plants (Triticum aestivum cv. Warigal) here grown in a solonised brown soil (Calcixerollic xerochrept) which had been previously cropped to medic (Medicago trunculata cv. Paraggio). The 33P-labelled medic residues and 32P-labelled monocalcium phosphate were added to the soil in factorial combination. Amounts of 31P, 32P and 33P in the wheat plants and in the soil microbial biomass were determined. Addition of residues depressed wheat dry weight, 31P and 32P uptake, while simultaneously increasing amounts of 31P and 32P incorporated into the microbial biomass. Addition of fertiliser had no effect on the proportion of plant P taken up from the residues, but significantly increased the proportion of microbial P derived from this source. The 31P held in the microbial biomass was significantly increased by both residue and fertiliser P addition, with the former having the larger effect. Of the total P applied to the soil, medic residues contributed approximately one-quarter of that supplied by the fertiliser. Of the total P in the wheat plant, medic residues supplied approximately one-fifth of that supplied by the fertiliser.

scholarly journals Soil microbial biomass under mulch types in an integrated apple orchard from Southern Brazil

2011 ◽  
Vol 68 (2) ◽  
pp. 217-222 ◽  
Author(s):  
Denice de Oliveira Almeida ◽  
Osmar Klauberg Filho ◽  
Henrique Cesar Almeida ◽  
Luciano Gebler ◽  
Aline Franciane Felipe
Keyword(s):  
Microbial Biomass ◽  
Soil Microbial Biomass ◽  
Apple Orchard ◽  
Southern Brazil ◽  
Pine Needle ◽  
Nitrogen And Phosphorus ◽  
Soil Microbial ◽  
Microbial Nitrogen ◽  
Microbial Carbon ◽  
Black Plastic

The use of mulching is an alternative to control weeds but there are few studies on its effect on soil quality. In this sense, this study aimed to evaluate the effect of types of mulching on the attributes of microbial carbon, nitrogen and phosphorus in a Typic Hapludox with production of integrated apples in southern Brazil. The experiment was conducted in randomized blocks in the Vacaria, state of Rio Grande do Sul, southern Brazil. The soil mulch types studied were: pine needle, sawdust, black plastic and a control. The soil samples were collected in February (summer) and August (winter) of 2006, and the attributes related to total organic and microbial carbon, nitrogen and phosphorus were determined. Organic mulchings (pine needle and sawdust) promoted lower soil temperature, and greater moisture, microbial carbon (Cmic), microbial nitrogen (Nmic), and the ratios Cmic:Corg, Nmic:Norg and microbial C:N than black plastic. Microbial phosphorus was greater in winter. Sawdust mulching promoted the best conditions to microbial biomass in winter. The mulch types increased the microbial compartment in winter as compared to the nonweeded control .

Effects of bio-compound fertilizer on soil microbial community functional diversity and microbial biomass

2012 ◽  
Vol 20 (6) ◽  
pp. 746-751 ◽  
Author(s):  
Li SHAO ◽  
Jie GU ◽  
She-Qi ZHANG ◽  
Hua GAO ◽  
Qing-Jun QIN
Keyword(s):  
Microbial Community ◽  
Microbial Biomass ◽  
Functional Diversity ◽  
Soil Microbial Community ◽  
Soil Microbial ◽  
Compound Fertilizer

Intercropping perennial aquatic plants with rice improved paddy field soil microbial biomass, biomass carbon and biomass nitrogen to facilitate soil sustainability

2021 ◽  
Vol 208 ◽  
pp. 104908
Author(s):  
Jiaxin Wang ◽  
Xuening Lu ◽  
Jiaen Zhang ◽  
Hui Wei ◽  
Meijuan Li ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Aquatic Plants ◽  
Paddy Field ◽  
Soil Microbial Biomass ◽  
Biomass Carbon ◽  
Field Soil ◽  
Soil Microbial ◽  
Soil Sustainability ◽  
Paddy Field Soil
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