Water logging causes and effects pdf
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- Impacts Of Flooding/Waterlogging On Crop Development (07/03/13)
- Chapter 7: Managing Limiting Soil Factors
Climatic variability, typified by erratic heavy-rainfall events, causes waterlogging in intensively irrigated crops and is exacerbated under warm temperature regimes on soils with poor internal drainage. Irrigated cotton is often grown in precisely these conditions, exposing it to waterlogging-induced yield losses after substantial summer rainfall. This calls for a deeper understanding of mechanisms of waterlogging tolerance and its relevance to cotton.
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Waterlogging occurs when most or all of the macropores become filled with water rather than air. It occurs more easily in soils that have a greater proportion of micropores than macropores , because the macropores promote free drainage while the micropores tend to hold on to water. Both compaction ; which presses the soil particles and aggregates closer together, and dispersion ; which fills the pore spaces with clay particles, tend to promote waterlogging. Waterlogging is a common problem on many soil types , particularly in predominantly clay soils. Waterlogging may be due to periods of heavy rainfall, dispersion , compaction , poor irrigation management, rising watertables, or a combination of poor surface drainage across the paddock and poor subsurface drainage down the soil profile. Figure 7. In rain-fed WA dairy soils, waterlogging occurs in flat areas on soils comprising 0.
Impacts Of Flooding/Waterlogging On Crop Development (07/03/13)
Corresponding author mmorales ceaf. Under transient waterlogging, a number of transformations in the soil are generated associated with lack of aeration, seriously affecting the root system. Significant progress has been reported on understanding the effects of lack of oxygen on the metabolism of the roots, although few studies have examined changes in the soil. Diverging conclusions about the degree of tolerance exhibited by plants exclude the effects of hypoxia and anoxia on physical-chemical soil properties under plant experiments. This review examines the main changes occurring in soil and roots due to transient soil waterlogging conditions. Parameters such as antioxidant capacity, nutrient uptake dynamics and regeneration and distribution of the root system are relevant for selecting rootstocks tolerant to soil waterlogging. Key words: Root system, soil aeration, soil waterlogging, tolerance.
Chapter 7: Managing Limiting Soil Factors
In this study, a soil culture experiment was set up in barrels to investigate the effect of waterlogging duration at different growth stages on the growth, yield, and quality of cotton in the Huang-Huai Region of China during summer. The experiment was conducted at four growth stages of cotton seedling, squaring, flowering, and boll opening , and the waterlogging duration at each stage was set to five levels 2, 4, 6, 8, and 10 d and the waterlogging depth was 5cm. Twenty different treatment combinations were established, and one group without waterlogging throughout the whole growth period was used as the control CK. The results showed that the waterlogging treatments at the different growth stages reduced the morphological and yield parameters of the cotton plants as well as the physiological parameters of the cotton leaves, and the extent of the reduction in these parameters increased with the extension of the waterlogging duration.
This paper reviews a range of studies under controlled conditions glasshouse and growth cabinet focusing on the effects of the interaction between waterlogging hypoxia and salinity on the ion relations, growth and survival of higher plants. These increased concentrations in the shoots have adverse effects on plant growth and survival. It is argued that the interaction between waterlogging and salinity has major implications for saltland management, and for the selection and breeding of plants adapted to saltland.
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