Mineral magnetic properties of Chinese paddy soils and its pedogenic implications
Magnetic susceptibility (MS) of paddy soils (Hydragric Anthrosols) and their corresponding dryland soils formed on the same parent materials in Zhejiang Province of Eastern China were measured in order to understand better magnetic profile
discrimination and pedogenic magnetic minerals in paddy soils. Magnetic measurements showed that the MS values of paddy soils were much lower than those of dryland soils formed on the same parent materials. Paddy soils showed an obvious magnetic profile
differentiation due to the difference in soil pedo-hydrological regimes. Three distribution patterns of MS profiles could be identified in paddy soils. The differentiation of MS in paddy soils can be used to describe soil profile characterization, identify
Evaluation of the physical land characteristics for padi rice cultivation in Riam Kanan (South-Kalimantan, Indonesia)
The suitability for padi rice cultivation was studied for a coastal area in Indonesia. For each mapping unit considered, the following physical land characteristics are evaluated: topography, drainage, flooding texture, depth of a sulphuric horizon
Agroclimatologie ; Coimbatore ; Culture irriguée ; Céréale ; Géographie de l'Asie ; Inde ; Innovation ; Recherche agronomique ; Rendement agricole ; Riz paddy ; Station agronomique ; Sélection des espèces ; Tamil Nadu ; Technique agricole
Recherche agronomique dans le Tamil Nadu (India) pour améliorer les rendements du riz paddy et en adapter les variétés aux caractéristiques locales. (Vnm).
Assessing soil erosion in a terraced paddy field using experimental measurements and universal soil loss equation
that infiltration rates significantly increase when a terraced paddy field is under fallow or is planted with green manure; the paddy is more vulnerable to embankment collapse and increased the rates of soil erosion. The comparison revealed that soil conservation
using rice-planted terraced paddy was more effective than that resulting from other uses. The government should formulate effective measures and maintain sustainable rice planting in the terraced paddies.
Spatially explicit simulation of soil organic carbon dynamics in China's paddy soils
To reduce uncertainties from upscaling spatial processes of the DeNitrification-DeComposition (DNDC) model for improving the definition of China's paddy soils SOC stocks (0-30 cm) and their changes from 1980 to 2008, a soil polygon-based modeling
method was developed by integrating DNDC with the latest 1:1,000,000 soil database, derived from 1490 paddy soil profiles collected during the Second National Soil Survey of China. There were, however, large regional differences in sequestration outcomes
. Increases in paddy soil SOC stocks were found predominantly in South, Eastern and Southwest China. Enhancement in the soil databases with higher resolution inputs should improve the C sequestration estimates of any area of interest.
Incidental aquaculture in California's rice paddies : red swamp crawfish
Introduction of the red swamp crawfish, Procambarus clarkii, into California and its diffusion throughout northern California's rice paddies created the conditions for an incidental aquaculture economy in a landscape devoted to irrigated grain
Measurement of urbanization process and the paddy soil loss in Yixing city, China between 1949 and 2000
that the urban area grew more than three-fold during 51 years and the loss of paddy soil accounted for 82,9% of all soil loss. According to the expansion dynamics and the results of spatial metrics, the urban expansion process in Yixing could be divided into 4
Organic carbon accumulation in a 2000-year chronosequence of paddy soil evolution
for the stabilization of OC with increasing duration of paddy soil management. A chronosequence of 6 age groups of paddy soil formation was chosen in the Zhejiang Province (PR China), ranging from 50 to 2000 years (yrs) of paddy management. Soil samples obtained from
accretion of OC and seems to be an important long-term OC sink during soil evolution. With longer paddy management, the fractions < 20 μm showed an increasing actual OC saturation level, but did not reach the calculated potential storage capacity.
Développement rural ; Environnement ; Fertilité du sol ; Gestion des ressources ; Géographie de l'Asie ; Hydraulique agricole ; Production agricole ; Ressource en eau ; Riz paddy ; Récolte ; Sri Lanka ; Système d'irrigation ; Village
Les AA. recherchent les facteurs susceptibles d'expliquer les variations de la récolte en riz paddy dans un village, compte tenu de ressources en eau inégalement réparties. Aide à une meilleure gestion de ces ressources.