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Estimatting The Spacial Variation Of The Hardness Of Surface Soil Under Both Fixed And Pivotal Sprinkler Irrigation Systems In Gypsic Soil | ||
| Journal of Tikrit University For Agriculture Sciences | ||
| Article 1, Volume 13, Issue 2, 2013, Pages 406-418 | ||
| Abstract | ||
| A field experiment was conducted for the purpose of estimating the spatial variation of the soil surface hardness under sprinkler of fixed and pivotal irrigation systems in the gypsum soil. Measuring soil resistance was done by penetrometer and volumetric moisture content of the soil at points within the measuring network with a dimensions of 90 × 90 m and reached the distance between the measuring stations 15m. Results were analyzed in the ways that measure the traditional statistics and the concepts of geological statistics The result of analysis showed not to distribute the values of soil resistance to penetration and soil moisture distributed randomly according to the concepts of the traditional statistics of skew values amounted to resist the penetration of the soil under sprinkler of fixed and pivotal irrigation systems to 0.48 and 0.55 respectively and the distribution of the logarithmic oblique to the right for both sprinkler irrigation systems, which also indicates the existence of spatial variation. The amount of skew of volumetric soil moisture under sprinkler of fixed and pivotal irrigation systems 0.47 and -0.22, respectively, where the values distributed as a logarithmic distribution and by the deviation to the right under sprinkler of pivotal irrigation system, and the distribution of the logarithmic oblique to the left under sprinkler of fixed irrigation system, indicating the existence of spatial variation.. The results of autocorrelogram outlined the presence of a subjective correlation between the qualities of the studied physical soil (soil resistance to penetration and volumetric moisture content of soil) under sprinkler of fixed and pivotal irrigation systems, and the range of influence amounted to 45m. The results of variogram outlined the effect area amounted to 75m to the qualities of the studied soil and sprinkler of fixed and pivotal irrigation systems, and the results showed the existence of spatial variation amounted to 75m for both sprinkler of fixed and pivotal irrigation systems. | ||
| Keywords | ||
| Soil; surface | ||
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