Analysis of the spatial heterogeneity of wheat yield based on complex adaptive systems' approach
2009
Kataoka, T.(Tokyo Univ. (Japan)) | Kubota, H. | Yonekawa, S.
Twelve experimental sections of 4 rows x 3 m were established to examine the heterogeneity of a 72-a wheat field. Using 20 sample yield values from each experimental section, the heterogeneity of the field size was examined using the coefficient of variation through experimental section size and zoning size, which was a combination of several experimental sections. In addition, experimental section size and optimal number of samples in zoning were examined by randomly reducing the number of samples and by weighing the sample values. The results indicated that the space distribution of soil nitrate content and soil moisture content as well as the direction of movement of tractors affected the yield in this test agricultural field, indicating that these can be used as environmental factors in the concept of complex adaptive systems. This test agricultural field, sampling efficiency was improved by zoning the field into 4 sections, each of which had approximately the same environmental factors.
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