Abstract
Reducing the decision-making unit to classes within fields can improve yields, efficiency in the use of nutrients and profitability of crops. The objectives were to compare methods for class delimitation in wheat (Triticum aestivum L.) crops based on apparent productivity levels and establish similarities among them in terms of spatial overlapping, productive attributes and the use of nitrogen. In three wheat fields, high and low apparent productivity classes (APC) were defined based on eight methodologies: yield maps, soil maps, gramineae vegetation index, rotation crop index, interpretation of satellite images, management records, elevation and integrated soil and yield maps. In each APC, soil and crop yield components were determined under five nitrogen fertilization levels. Among delimitation methodologies, the degree of coincidence varied from 1.4 to 81.7%. The differences in soil properties, nitrogen use efficiency and grain yields were greater among fields than among APC within each field. In each field, the delimitation methodologies identified different single factors that discriminated among the potential management classes and were partially associated with the crop grain yields. The wheat crops at the low APC yielded 39% less and 12% less than at the high APC, respectively. The nitrogen fertilization, at the rate for maximum productivity for each ACP, reduced the yield differences between contrasting APC. Nitrogen fertilization also modified clustering of classes based on expected yields. Making management classes for wheat based on expected productivity is more accurate when based on previous crop production information under similar nitrogen fertilization conditions than the targeted crop.
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Data availability
The raw data support the findings of this study are available from the corresponding authors, M.J.L.S. and M.D.Z., upon reasonable request.
Abbreviations
- APC:
-
Apparent productivity classes
- ECa :
-
Apparent electrical conductivity
- ELE:
-
Elevation
- GNSS:
-
Global navigation satellite system
- INTA:
-
National Institute for Agricultural Technology
- MR:
-
Management records
- N:
-
Nitrogen
- Na:
-
Available nitrogen levels
- NDVI:
-
Normalized and differential vegetation indexes
- NDVIall:
-
Normalized and differential vegetation indexes of crop rotation
- NDVIgra:
-
Normalized and differential vegetation indexes of gramineae
- NUE:
-
Nitrogen use efficiency
- OMI:
-
Organic matter index
- OPC:
-
Observed productivity classes
- P:
-
Phosphorus
- PhSI:
-
Photo interpretation of satellite images
- SM:
-
Soil mapping
- SOC:
-
Soil organic carbon
- SS:
-
Standardized sum
- YM:
-
Yield mapping
- YN:
-
Grain yield increase associated with nitrogen
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Funding for this research project was provided by INTA MSE AP I177.
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López de Sabando, M.J., Diaz-Zorita, M. Field methods for making productivity classes for site-specific management of wheat. Precision Agric 23, 1153–1173 (2022). https://doi.org/10.1007/s11119-022-09878-3
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DOI: https://doi.org/10.1007/s11119-022-09878-3