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• W20149324 abstract "Site-specific crop management requires an understanding of relationships between soil and crop measurements in relation to within-field yield variability. The objectives of this study were to identify underlying associations of soil and crop properties using multivariate techniques and to determine their importance in explaining soybean {Glycine max [L.] Merr.) yield variability on five producer's fields. Soil, terrain, and crop variables measured included soil texture, soil organic matter, soil pH, exchangeable Ca and Mg, cation exchange capacity, soil-test P and K; elevation; early growth and early P and K uptake; crop height, plant population, and the incidence of several weeds and diseases. These measurements often were highly correlated and the correlations varied across fields. Factor analysis (FA) grouped correlated site variables into at least three common factors for all fields: conditions for early growth, the interaction between landscape position and soil properties of intrinsic origin, and soil P and K availability. Multiple regression of yield on new variables derived from FA or principal component analysis (PCA) showed that the importance of grouped variables in explaining yield variability varied from field to field. Use of FA or PCA resulted in a similar prediction of within-field yield variability. The explained yield variation was 65 % in one field with large yield variation (35.1 % coefficient of variation) and 10 to 42 % in four fields with small yield variation (< 10 % coefficient of variation). Non-measured variables, such as soil water" @default.
• W20149324 created "2016-06-24" @default.
• W20149324 creator A5008455522 @default.
• W20149324 date "2018-08-13" @default.
• W20149324 modified "2023-09-23" @default.
• W20149324 title "Efficacy of multivariate analysis and zone soil sampling to study relationships between site variables affecting crop yield and yield response to phosphorus and potassium fertilization" @default.
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• W20149324 doi "https://doi.org/10.31274/rtd-180813-150" @default.
• W20149324 hasPublicationYear "2018" @default.
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