Alluvial Soil Quality Indicators As Affected By Different Land-Uses. مؤشرات جودة التربة الطمييه تحت تأثير الاستخدامات المختلفة للأراضي.

Abstract

Soil deterioration and yield decline are the main factors affecting the environmental sustainability of long-term irrigated sugarcane monoculture. This research was conducted to detect changes of soil physical, chemical and physicochemical quality parameters associated with intensive irrigated sugarcane monoculture with groundwater for long term. Sugarcane monoculture resulted in a severe impact on some soil physical indicators of soil quality as increased the soil bulk density and reduced soil clay content, decreased soil aggregate stability and the water content at the field capacity causing decreases in soil porosity and decline in soil fertility. Significant impacts on some soil chemical indicators of soil quality were also recorded as reduced soil organic matter content and increased soil pH and EC producing soil salinity. Fields under long-term irrigated sugarcane monoculture had low OM values ranged from 2.09 to 2.61% while areas under crop rotation had the highest OM values ranged from 2.62 to 3.39%. Fields under sugarcane monoculture system had higher pH, EC and SAR values ranged from 7.96 to 8.41, from 2.98 to 4.22 dS m -1 and from 7.75 to 11%, while fields under crop rotation system had the lowest pH, EC and SAR values ranged from 7.64 to 7.92, 1.41 to 2.42 dS m -1 and from 4.51 to 5.86%, respectively. From these results, it could be concluded that long term sugarcane monoculture has significantly deteriorated soil physical and chemical properties indicating the urgent demand for more sustainable management practices to preserve soil quality.

Sustainable Solutions for Arid Regions: Harnessing Aquaponics Water to Enhance Soil Quality in Egypt

“…These quantities in both aquaculture environments were over the World Health Organization's allowable limits for fish farming, and the findings completely confirm those of [30,33]. Monitoring the presence of microorganisms dangerous to people and identifying bacterial species that may be transmitted to irrigated fish or crops, which may represent dangers to human health, are major goals of bacteriological investigations of water used to irrigate crops or fish.…”

“…Leaf burning and dead tissue around the outer edges of the leaves are the typical signs of sodium poisoning, but the symptoms of chloride toxicity first emerge at the distal tip of the leaves and are therefore more challenging to diagnose [31]. Chloride content is essential for identifying whether water is acceptable for irrigation since chloride ions are harmful and most plants are particularly sensitive to chloride in irrigation water [32][33][34]. Bicarbonate concentrations in both aquaculture waters ranged from 1.5 to 8.5 meq L −1 (Table 4), which falls under the category of "Slight to Moderate" use restrictions.…”

“…Bicarbonate concentrations in both aquaculture waters ranged from 1.5 to 8.5 meq L −1 (Table 4), which falls under the category of "Slight to Moderate" use restrictions. As a result, utilizing this water to irrigate crops may cause white scale issues on plants or fruits during spray irrigation or block emitters when using drip irrigation [32,33]. The irrigation technique being utilized will determine the management decisions to be made to prevent a deposit issue.…”

“…The pH of catfish water with soil filtering was lower by up to 0.42 pH units when compared to tilapiafiltrated water. The primary function of water pH, according to Abd El-Azeim et al [33] and FAO [28], is to identify abnormal water that may cause a nutritional imbalance or contain toxic ions and, as a result, requires additional examination. The soil filtration process can significantly change the pH of the drainage water following each irrigation cycle.…”

“…High Mg 2+ concentrations in irrigation water produce an increase in exchangeable Na + in irrigated soils, boosting the magnesium hazard index, which may damage soil structure and decrease crop nutrient uptake by increasing soil alkalinity. Water with a magnesium hazard of more than 50% is recognized as being inappropriate and extremely dangerous for the majority of farmed soils [31,33].…”