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Analysis of the effects of climate change on pH and salinity of soil in Bakoum valley watershed (Sedhiou Region/Senegal) 气候变化对巴库姆流域(塞内加尔塞迪乌地区)土壤pH和盐度的影响分析

Nippon Journal of Environmental Science Pub Date : 2020-09-01 DOI: 10.46266/njes.1019

F. Dramé, S. Ndiaye, Pape Ibrahima Djighaly, Amadou Diarra

{"title":"Analysis of the effects of climate change on pH and salinity of soil in Bakoum valley watershed (Sedhiou Region/Senegal)","authors":"F. Dramé, S. Ndiaye, Pape Ibrahima Djighaly, Amadou Diarra","doi":"10.46266/njes.1019","DOIUrl":"https://doi.org/10.46266/njes.1019","url":null,"abstract":". In Senegal, the effects of climate change have led to increased salinization, acidification and silting of arable land. Agricultural land management using geomatics tools has become essential for sustainable agriculture. The aim of this study is to determine the impact of salinization, acidification and siltation in the valley of the Bakoum watershed. For this purpose, Aster images (MNT) with a resolution of 30 m were used. This operation was followed by the taking of GPS points in the study area in order to geolocate the infrastructures and delimit the areas lost by the degradation phenomena. A total of 36 soil samples were taken, including 24 samples at depths of 0-20 cm and 20-40 cm in 2015; and 12 samples at depths of 0-20 cm and 20-40 cm in 2017. They were analysed in the laboratory to assess electrical conductivity and pH in 2015 and 2017. In two years, the salinity of the valley soils varied from 83 to 9540 µohm in 2015 and from 20 to 7440 µohm in 2017. Acidity (pH) ranged from 3.6 to 4.2 in 2015 and 3.16 to 4.8 in 2017. The area lost due to salinity, acidity and silting is estimated at 31 ha, i.e. 0.74% of the valley area. These results show that urgent measures must be taken to better exploit the valley's rice-growing potential and thus contribute to the revival of rice-growing activities in the region.","PeriodicalId":424760,"journal":{"name":"Nippon Journal of Environmental Science","volume":"358 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122810982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Validation of Fertilizer Requirement Map for bread wheat at Lume District, East Shewa Zone, Oromia, Ethiopia 埃塞俄比亚奥罗米亚州东谢瓦区卢梅县面包小麦肥料需求图的验证

Nippon Journal of Environmental Science Pub Date : 2020-05-01 DOI: 10.46266/njes.1005

Tilahun Abera, Reta Worku, Tilahun Firomsa, Tadesa Hunduma, B. Abebe

{"title":"Validation of Fertilizer Requirement Map for bread wheat at Lume District, East Shewa Zone, Oromia, Ethiopia","authors":"Tilahun Abera, Reta Worku, Tilahun Firomsa, Tadesa Hunduma, B. Abebe","doi":"10.46266/njes.1005","DOIUrl":"https://doi.org/10.46266/njes.1005","url":null,"abstract":"Fertilizer recommendations in Ethiopia in general and Lume district, in particular, are of blanket type for bread wheat production and are based on soil color characteristics rather than on soil test results and crop requirements. Hence Batu Soil Research Center was produced fertilizer requirement map and field experiments were carried out on nine peasant associations of Lume district to validate the quality of fertilizer requirement map on some yield components and yield of bread wheat crop. The treatments consisted of Control (unfertilized plot), Blanket (100/100 NPS/Urea), P-map (phosphorus applied from fertilizer requirement map) and P-required (Pc-P0)*Pf ) were laid out with simple adjacent plots and replicated over nine location (Peasant association). The Analysis of Variance indicates that Bread wheat grain Yield, Biomass and Harvest index were highly significantly (P<0.01) influenced by treatment applied. P-required (Pc-P0)*Pf) gave the highest (4039 kg ha) grain yield and (9964 kg ha ) Biomass yield except (47.33%) harvest index which was recorded by P-map (phosphorus applied from fertilizer requirement map). While the lowest (1072 kg ha) grain yield and (3294 kg ha ) Biomass and (32.03%) harvest index were recorded by unfertilized plot. However, the economic analysis revealed that for a treatment to be considered as worthwhile to farmers (100% marginal rate of return) application of P-map (phosphorus applied from fertilizer requirement map) is profitable for Bread wheat crop production and recommended for farmers in Lume district.","PeriodicalId":424760,"journal":{"name":"Nippon Journal of Environmental Science","volume":"69 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141208460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1