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Agronomy 2018, 8(12), 298; https://doi.org/10.3390/agronomy8120298

Spatial and Temporal Trends of Irrigated Cotton Yield in the Southern High Plains

Department of Plant and Soil Science, Texas Tech University, 2911 15th Street, Lubbock, TX 79409, USA
Received: 18 September 2018 / Revised: 29 November 2018 / Accepted: 5 December 2018 / Published: 8 December 2018
(This article belongs to the Special Issue Information Technologies for Precision Plant and Crop Protection)
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Abstract

Understanding spatial and temporal variability patterns of crop yield and their relationship with soil properties can provide decision support to optimize crop management. The objectives of this study were to (1) determine the spatial and temporal variability of cotton (Gossypium hirsutum L.) lint yield over different growing seasons; (2) evaluate the relationship between spatial and temporal yield patterns and apparent soil electrical conductivity (ECa). This study was conducted in eight production fields, six with 50 ha and two with 25 ha, on the Southern High Plains (SHP) from 2000 to 2003. Cotton yield and ECa data were collected using a yield monitor and an ECa mapping system, respectively. The amount and pattern of spatial and temporal yield variability varied with the field. Fields with high variability in ECa exhibited a stronger association between spatial and temporal yield patterns and ECa, indicating that soil properties related to ECa were major factors influencing yield variability. The application of ECa for site-specific management is limited to fields with high spatial variability and with a strong association between yield spatial and temporal patterns and ECa variation patterns. For fields with low variability in yield, spatial and temporal yield patterns might be more influenced by weather or other factors in different growing seasons. Fields with high spatial variability and a clear temporal stability pattern have great potential for long-term site-specific management of crop inputs. For unstable yield, however, long-term management practices are difficult to implement. For these fields with unstable yield patterns, within season site-specific management can be a better choice. Variable rate application of water, plant growth regulators, nitrogen, harvest aids may be implemented based on the spatial variability of crop growth conditions at specific times. View Full-Text
Keywords: spatial and temporal variability; precision agriculture; cotton; apparent soil electrical conductivity spatial and temporal variability; precision agriculture; cotton; apparent soil electrical conductivity
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Guo, W. Spatial and Temporal Trends of Irrigated Cotton Yield in the Southern High Plains. Agronomy 2018, 8, 298.

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