Soil organic matter and the indigenous nitrogen supply of intensive irrigated rice systems in the tropics

1996 ◽  
Vol 182 (2) ◽  
pp. 267-278 ◽  
Author(s):  
K. G. Cassman ◽  
A. Dobermann ◽  
P. C. Sta Cruz ◽  
G. C. Gines ◽  
M. I. Samson ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Nitrogen Supply ◽  
Irrigated Rice ◽  
The Tropics ◽  
Indigenous Nitrogen Supply

scholarly journals Soil nitrogen supply of peat grasslands estimated by degree days and soil organic matter content

2020 ◽  
Vol 117 (3) ◽  
pp. 351-365
Author(s):  
J. Pijlman ◽  
G. Holshof ◽  
W. van den Berg ◽  
G. H. Ros ◽  
J. W. Erisman ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Nitrogen ◽  
Organic Matter Content ◽  
Matter Content ◽  
Nitrogen Supply ◽  
Degree Days ◽  
Soil Organic Matter Content ◽  
Soil Nitrogen Supply

Soil organic matter in physical fractions after intensification of irrigated rice-pasture rotation systems

2021 ◽  
Vol 213 ◽  
pp. 105160
Author(s):  
Ignacio Macedo ◽  
M.Virginia Pravia ◽  
Jesús Castillo ◽  
José A. Terra
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Irrigated Rice

scholarly journals Potential relevance of Mortierella alpina as a source of ice nucleating particles in soil

2018 ◽  
Author(s):  
Franz Conen ◽  
Mikhail V. Yakutin
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Fungus ◽  
Soil Samples ◽  
Mortierella Alpina ◽  
Soil Particles ◽  
The Tropics

Abstract. Soil organic matter carries ice nucleating particles (INP) of which the origin is hard to define and that are active at slight supercooling. The discovery and characterisation of INP produced by the widespread soil fungus Mortierella alpina permits a more targeted investigation of the likely origin of INP in soils. We searched for INP with characteristics similar to those reported for M. alpina (INPM-like) in 20 soil samples from four areas in the northern midlatitudes and one area in the tropics. In the 15 samples where we could detect INPM-like, they constituted between 1 and 94 % (median 11 %) of all INP active at −10 °C or warmer associated with soil particles

Simulation study of nitrogen supply in boreal forests using model of soil organic matter dynamics ROMUL

2001 ◽  
pp. 900-901
Author(s):  
O. G. Chertov ◽  
A. S. Komarov ◽  
M. Nadporozhskaya ◽  
S. S. Bykhovets ◽  
S. L. Zudin
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Simulation Study ◽  
Boreal Forests ◽  
Nitrogen Supply ◽  
Soil Organic Matter Dynamics ◽  
Organic Matter Dynamics

RELATIVE IMPORTANCE OF SOIL ORGANIC MATTER, SOIL LITTER AND LITTER FALL IN THE TROPICS

2015 ◽  
pp. 85-96 ◽  
Author(s):  
M. Janssens ◽  
J. Pohlan ◽  
V. Mulindabigwa ◽  
D. Sonwa ◽  
Z. Deng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Relative Importance ◽  
Litter Fall ◽  
The Tropics

scholarly journals Managing soils for long-term productivity

1997 ◽  
Vol 352 (1356) ◽  
pp. 1011-1021 ◽  
Author(s):  
J. K. Syers
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Microbial Biomass ◽  
Soil Fertility ◽  
Organic Material ◽  
Soil Degradation ◽  
Turnover Rate ◽  
Management Practices ◽  
The Tropics

Meeting the goal of long–term agricultural productivity requires that soil degradation be halted and reversed. Soil fertility decline is a key factor in soil degradation and is probably the major cause of declining crop yields. There is evidence that the contribution of declining soil fertility to soil degradation has been underestimated. Sensitivity to soil degradation is implicit in the assessment of the sustainability of land management practices, with wide recognition of the fact that soils vary in their ability to resist change and recover subsequent to stress. The concept of resilience in relation to sustainability requires further elaboration and evaluation. In the context of soil degradation, a decline in soil fertility is primarily interpreted as the depletion of organic matter and plant nutrients. Despite a higher turnover rate of organic matter in the tropics there is no intrinsic difference between the organic matter content of soils from tropical and temperate regions. The level of organic matter in a soil is closely related to the above and below ground inputs. In the absence of adequate organic material inputs and where cultivation is continuous, soil organic matter declines progressively. Maintaining the quantity and quality of soil organic matter should be a guiding principle in developing management practices Soil microbial biomass serves as an important reservoir of nitrogen (N), phosphorus (P) and sulphur (S), and regulates the cycling of organic matter and nutrients. Because of its high turnover rate, microbial biomass reacts quickly to changes in management and is a sensitive indicator for monitoring and predicting changes in soil organic matter. Modelling techniques have been reasonably successful in predicting changes in soil organic matter with different organic material inputs, but there is little information from the tropics. Nutrient depletion through harvested crop components and residue removal, and by leaching and soil erosion accentuates the often very low inherent fertility of many soils in the tropics. An integrated approach involving inorganic and organic inputs is required where animal and plant residues are returned, as far as practicable. Chemical fertilizers alone cannot achieve long–term productivity on many soils and organic material inputs are required to maintain soil organic matter levels and crop productivity. A major research effort is required to develop improved strategies for halting and reversing soil degradation if long–term productivity is to be secured.

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