Thirteen soil profiles were selected to represent the soils of the college of agriculture farm, Sohag, South Valley University to estimate and evaluate the changes in these soils. A rating scale was developed to quantitatively evaluate several important morphological properties of soils. It was used in two ways 1) to determine the relative horizon distinctness (RHD), by a comparison of adjacent horizons 2) to determine the relative profile development (RPD), by a comparison between C horizon and the horizons above it in the profile. Also, a mineralogical study of the sand fraction was conducted on soils to evaluate the origin, uniformity and weathering status of these soils. Data obtained show that soils of the Typic Haplocalcids subgroup are of clearer horizontation than Typic Torriorthents or Typic Torripsamments; as indicated by the morphological RHD. The RPD values of the studied soils reveal that soils of the Typic Torriorthents have higher values compared with other soils. Microscopic examination of the sand fraction shows that the minerals of the light fraction are mainly dominated by quartz followed by feldspars beside small amount of calcite. On other hand, opaque minerals dominate the heavy fraction of all studied soils of both locations. The non-opaques are composed essentially of epidotes, zircon and amphiboles and are present in relatively high amounts. Pyroxenes, garnet, biotite and rutile are found in pronounced amounts while other minerals are found in minor quantities. Uniformity and weathering ratios indicate that the soils are heterogeneous, either due to their multi-origin or to the multi-depositional regime. Thus, the soils are weakly developed, pedogenically young and are formed from heterogeneous parent materials.

Thirteen soil profiles were selected to represent the soils of the college of agriculture farm, Sohag, South Valley University to estimate and evaluate the changes in these soils. A rating scale was developed to quantitatively evaluate several important morphological properties of soils. It was used in two ways 1) to determine the relative horizon distinctness (RHD), by a comparison of adjacent horizons 2) to determine the relative profile development (RPD), by a comparison between C horizon and the horizons above it in the profile. Also, a mineralogical study of the sand fraction was conducted on soils to evaluate the origin, uniformity and weathering status of these soils. Data obtained show that soils of the Typic Haplocalcids subgroup are of clearer horizontation than Typic Torriorthents or Typic Torripsamments; as indicated by the morphological RHD. The RPD values of the studied soils reveal that soils of the Typic Torriorthents have higher values compared with other soils. Microscopic examination of the sand fraction shows that the minerals of the light fraction are mainly dominated by quartz followed by feldspars beside small amount of calcite. On other hand, opaque minerals dominate the heavy fraction of all studied soils of both locations. The non-opaques are composed essentially of epidotes, zircon and amphiboles and are present in relatively high amounts. Pyroxenes, garnet, biotite and rutile are found in pronounced amounts while other minerals are found in minor quantities. Uniformity and weathering ratios indicate that the soils are heterogeneous, either due to their multi-origin or to the multi-depositional regime. Thus, the soils are weakly developed, pedogenically young and are formed from heterogeneous parent materials.

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An area of about half acre was cultivated with tomato (Lycopersicon esculentum Mill) in 2012 summer season. Obtained data indicated that the infestation began when the plant aged one month. Infestation with T. absoluta reached the maximum number of 50 and 28 larvae per 10 leaves on hybrids of H6 and H7, respectively. The infestation was then decreased gradually until the end of the season. The relative efficiency of the plant age factor was found 25% out of about 90%. Data indicated also that mirid bugs seemed to be responsible for about 14% of the variability of the infestation with T. absoluta larvae. Mirid bugs occupied the second rank of the rating sort. Both hybrids, (H6 and H7) showed similar effect of maximum temperature on larval infestation. Rating sort of co-efficient of determination revealed that the air temperature ranked the fourth factor. However, air temperature was found to be responsible for about 9% and 10% of the variability of larval infestation between the two hybrids H6 and H7, respectively. The maximum relative humidity took the lowest level. The statistical analysis indicated that the coefficient of determination of soil temperature and larvae of T. absoluta infesting H6 and H7 was about 10% and 17%, respectively. Results of the present investigation clearly show that plant age (Rate 1) may be the key factor as it had a small simple correlation despite RH (Rate8) approximately had a similar simple correlation. These reversed evidences, prove that the simple correlation is not enough to determine the potency of an independent factor unless it correlate with other factors. Thus, multi-coefficient analysis is highly recommended in such cases.