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Assiut University (2019)

Soil Fertility Status of Some Agricultural Areas in El-Kharga Oasis in New Valley

Mahmoud, Asmaa Hamdy Ahmed.

Titre : Soil Fertility Status of Some Agricultural Areas in El-Kharga Oasis in New Valley

Auteur : Mahmoud, Asmaa Hamdy Ahmed.

Etablissement de soutenance : Assiut University

Grade : Master in Agricultural Sciences 2019

Résumé partiel
New Valley governorate is a part of the Western Desert, located at the southwestern part of Egypt, bordered by the Nile Valley at east, Libya at west, Sudan at south and El-Bahariya Oasis at north. It occupies )458,000 km2) and about 48 % of the total area of Egypt. It includes El-kharga, Baris, El-Dakhla, Gharb El- Mohob, Abou Monkar and El-Farafra oases.El-Kharga Oasis covers an area of about 4500 km2. It is bounded by longitudes 30° 27’ and 30° 47’ E and latitudes 24° 30’ and 26° 00’ N. The current study aimed to Evaluation of levels of fertility in some cultivated soils in El-kharga oasis through:1. Surveying the fertility of some of the cultivated areas in El-Kharga oasis.2.Determining the major physical and chemical characteristics of these area. 3. Determining the )N-P-K( nutrients status of the soils to suggest of the possible strategies for the cultivation of these soils.A total number of 100 sites of cultivated areas , Average sampling distance of 1.5 km. Surface and subsurface soil samples were collected. The study area were divided to four sections namely :1- North El-Kharga was represented by 28 sites. 2-Center of El-kharga area was represented by 30 sites.3-South El-kharga area was represented by 31 sites.4- Baris area was represented by only 11 sites.Data obtained could be summarized in the following:1. Soil texture : The texture of the four study areas as general was coarse the percentage of the sandy samples in north, central and south El-Kharga were 33.93, 45.00 and 17.74% respectively, no sand samples in Baris. Generally the percentage of the five texture clones namely sand, loamy sand, sandy loam, sandy clay loam and loam were 28.5, 31.5, 29, 10 and 1% respectively.2. The saturation percentage (SP%) : The coarse texture of the surface 60 cm of the area reflected low saturation as 43.5% of the samples has saturation percentage less than 40%, 31% of the samples has saturation percentage 50% which may be associated with clay minerals in the shales of El-Kharga. The average of SP% was 38.93, 39.32, 47.13 and 48.36% for the soil of north El-kharga, center El-Kharga, south El-Kharga and Baris respectively, with general average of 42.63% . 3. Soil pH of El-Kharga ranges from 7.15 to 8.8. The data showed that 51.0% of the samples have pH values less than 8.0 and 39.5% of the samples were between 8.0 and less than 8.5 . in other word 90.5% of the samples were not sodic and only 9.5% of the samples were ≥ 8.5 or sodic 4. Electrical Conductivity (ECe) :-The mean of surface and subsurface ECe value showed that 15% of the samples were less than 4 dSm-1, and 85%of the samples are saline. However 37% of the samples have dSm-1 between 4 to 8 or saline soil and 30% were between 8 to 16 dSm-1 or highly saline and 18%of the samples were very highly saline with dSm-1 >16 . Therefor 85% of the samples are saline with dSm-1 more than 4 dSm-1. Generally, the ECe ranged between 2.21 to 53.38 dSm-1 with average 10.47 dSm-1 in El-Kharga Oasis. The average ECe values 13.85, 11.75, 9.00 and 5.82 from north El-kharga to center El-Kharga, south El-Kharga and Baris respectively.5. Organic matter content :- The desert soil of El-Kharga have 0.00 to 0.76 % O.M.  6. Total carbonates (CaCO3) : 66 % of the samples have CaCO3 less than 1 % and 30 % of the samples were between 1 and 2%. Only 5.5 % of the samples range 2.13 to 4.27 % CaCO3.7. Cation Exchange Capacity (CEC) of El-Kharga soils showed low Cation exchange capacity. CEC values ranges between 5.76 and 71.04 Cmol (+)/kg soil with average of 21.56 Cmol (+)/kg . The average CEC were 20 , 17.46, 23.64 and 28.49 in samples of north El-kharga to center El-Kharga, south El-Kharga and Baris respectively. The highest value were 71.04 Cmol (+)/kg for the loam samples .8. Sodium adsorption ratio (SAR) : The results showed 97% of samples were less than 15 and only 3% have SAR value more than 15. The average of SAR values were 7.12, 3.73, 4.74 and 5.05 for the samples of North El-kharga to Baris.9. Soluble Ions : Soluble Cations :Soluble cations are generally high in El-Kharga soils matched the high ECe values. The value of the four soluble cations arranged in order of Ca, Mg, Na, K with average value of 15.17, 13.63, 12.56 and 4.44 Same order.

Présentation étendue (EULC)

Page publiée le 8 avril 2020