Effect of a legume on soil nitrogen mineralisation and percentage nitrogen in grasses

1967 ◽  
Vol 27 (2) ◽  
pp. 292-296 ◽  
Author(s):  
H. F. Birch ◽  
H. W. Dougall
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Mineralisation

Influence of size of rainfall events on water-driven processes. II. Soil nitrogen mineralisation in a semi-arid environment

2003 ◽  
Vol 54 (4) ◽  
pp. 353 ◽  
Author(s):  
Victor O. Sadras ◽  
Jeffrey A. Baldock
Keyword(s):  
Soil Nitrogen ◽  
Sandy Loam ◽  
Variable Temperature ◽  
Weather Data ◽  
Annual Rainfall ◽  
Substantial Part ◽  
Nitrogen Mineralisation ◽  
Evaporative Demand ◽  
Fixed Temperature ◽  
Rainfall Events

Power laws describe the relationships between the number N (s) and the size s of daily rainfall events, i.e. N (s) ~ s–τ, with higher τ corresponding to sites or seasons with greater frequency of small rainfall events. This paper tested the hypothesis that the rate of soil nitrogen mineralisation increases with increasing exponent τ, as affected by both spatial and temporal sources of variation. Rates of nitrogen mineralisation in an uncropped sandy loam soil were calculated using a simulation model with detailed nitrogen and water balances, and long-term weather data for 6 Australian locations in a range of annual rainfall from 260 to 360 mm. Daily rates of mineralisation were calculated using actual rainfall, and variable or fixed temperature and evaporative demand. The annual pattern of mineralisation rate, calculated as a function of rainfall and variable temperature and evaporative demand, was bimodal with peaks in April and November. These peaks disappeared and differences among locations were reduced when the effects of temperature and evaporative demand were removed. Under constant temperature and evaporative demand, mineralisation rates between April and November were 68% greater than rates between December and March. In the former period, characterised by a high frequency of small rainfall events, monthly mineralisation rate was a direct function of the amount of rainfall. In contrast, mineralisation was independent of the amount of rainfall during the period of larger, less frequent rainfall events from December to March. Parameter τ accounted for 75% of the variation in mineralisation rate in the period December–March and it also accounted for a substantial part of the variation between periods.

scholarly journals Soil net nitrogen mineralisation across global grasslands

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
A. C. Risch ◽  
S. Zimmermann ◽  
R. Ochoa-Hueso ◽  
M. Schütz ◽  
B. Frey ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Nutrient Cycling ◽  
Soil Nitrogen ◽  
Real World ◽  
Clay Content ◽  
Global Scale ◽  
Climate Data ◽  
Nitrogen Mineralisation ◽  
Inorganic N ◽  
Soil Functioning

Abstract Soil nitrogen mineralisation (Nmin), the conversion of organic into inorganic N, is important for productivity and nutrient cycling. The balance between mineralisation and immobilisation (net Nmin) varies with soil properties and climate. However, because most global-scale assessments of net Nmin are laboratory-based, its regulation under field-conditions and implications for real-world soil functioning remain uncertain. Here, we explore the drivers of realised (field) and potential (laboratory) soil net Nmin across 30 grasslands worldwide. We find that realised Nmin is largely explained by temperature of the wettest quarter, microbial biomass, clay content and bulk density. Potential Nmin only weakly correlates with realised Nmin, but contributes to explain realised net Nmin when combined with soil and climatic variables. We provide novel insights of global realised soil net Nmin and show that potential soil net Nmin data available in the literature could be parameterised with soil and climate data to better predict realised Nmin.

The interactive effects of soil disturbance and residue quality on soil nitrogen mineralisation in a tropical sandy soil

Soil Research ◽  
2020 ◽  
Vol 58 (3) ◽  
pp. 277
Author(s):  
Somchai Butnan ◽  
Patma Vityakon
Keyword(s):  
Sandy Soil ◽  
Soil Nitrogen ◽  
Early Stage ◽  
Soil Disturbance ◽  
Interactive Effects ◽  
Plant Residue ◽  
N Mineralisation ◽  
Residue Quality ◽  
Nitrogen Mineralisation ◽  
Nitrate N

Soil conservation practices, such as reduced and no tillage, have been found to enhance soil nitrogen (N) sequestration through decreasing the rate of N mineralisation of added organic materials. Nitrogen mineralisation is not only affected by tillage, but also by the quality (chemical composition) of the organic residues. This study evaluated the interaction of residue quality and soil disturbance on N mineralisation in a sandy soil. A 112-day incubation experiment was conducted with two levels of soil disturbance (undisturbed and disturbed conditions) and five plant residue amendments of contrasting quality. The contrasting quality (N, lignin (L), and polyphenols (Pp)) (in g kg–1) amendments follow: (i) unamended; (ii) Sesbania grandiflora (N 44, L 173, Pp 9.2); (iii) Indigofera hirsuta (N 41, L 177, Pp 30); (iv) Dipterocarpus tuberculatus (N 8.2, L 203, Pp 71); and (v) Eucalyptus camaldulensis (N 9.7, L 126, Pp 110). Residues (ii) and (iii) were fresh legume leaves, while (iv) and (v) were non-legume leaf litter. Disturbance only significantly increased N mineralisation rates in the legume-residue treated soils (increases of 18.8% for S. grandiflora and 27.1% for I. hirsuta) during the early stage of decomposition (first 14 days). In the legume treatment, disturbance significantly increased the ammonification, but decreased nitrification in soil relative to undisturbed soils. The difference in patterns of ammonification and nitrification was more pronounced in the early than in the later period of decomposition. This indicated an inhibitory effect of soil disturbance on nitrification, which was particularly pronounced in the legume-treated soils. The Pp content of residues was the major quality parameter regulating the soil ammonium-N and nitrate-N concentrations. Minimum soil disturbance should be adopted under legume soil organic amendment so that both ammonification and nitrification components of N mineralisation process can occur normally, and nitrate-loving crops can take up N in the form of nitrate-N which will enhance their yields. Moreover, undisturbed conditions under legume organic amendments reduced N mineralisation, resulting in enhancing soil N sequestration.

Soil nitrogen mineralisation dynamics under long-term different irrigation methods in greenhouses

2014 ◽  
Vol 63 (sup2) ◽  
pp. 117-126 ◽  
Author(s):  
Jinghong Ji ◽  
Yulong Zhang ◽  
Yuling Zhang ◽  
Na Yu ◽  
Hongtao Zou ◽  
...  
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Mineralisation ◽  
Irrigation Methods
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