The Role of Precision Agriculture in Cropping Systems

Koch, B.; Khosla, Rajiv

doi:10.1300/j144v09n01_02

Cited by 38 publications

(27 citation statements)

References 18 publications

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“…It should be intensive enough to be able to create sound management zones. For this reason, soil sampling is labor intensive, time consuming and sometimes temporally variable, which means that the soil needs to be sampled every growing season to determine crop nutrient levels in fields where there is variable-rate fertilizer application (Gotway et al 1996;Fleming et al 2001;Nolan et al 2000;Koch and Khosla 2003). Yield maps produced from GPS-equipped grain yield monitors also provide information about the spatial variation of a field.…”

Section: Introductionmentioning

confidence: 99%

The delineation of agricultural management zones with high resolution remotely sensed data

et al. 2009

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Remote sensing (RS) techniques have been widely considered to be a promising source of information for land management decisions. The objective of this study was to develop and compare different methods of delineating management zones (MZs) in a field of winter wheat. Soil and yield samples were collected, and five main crop nutrients were analyzed: total nitrogen (TN), nitrate nitrogen (NN), available phosphorus (AP), extractable potassium (EP) and organic matter (OM). At the wheat heading stage, a scene of Quickbird imagery was acquired and processed, and the optimized soil-adjusted vegetation index (OSAVI) was determined. A fuzzy k-means clustering algorithm was used to define MZs, along with fuzzy performance index (FPI), and modified partition entropy (MPE) for determining the optimal number of clusters. The results showed that the optimal number of MZs for the present study area was three. The MZs were delineated in three ways; based on soil and yield data, crop RS information and the combination of soil, yield and RS information. The evaluation of each set of MZs showed that the three methods of delineating zones can all decrease the variance of the crop nutrients, wheat spectral parameters and yield within the different zones. Considering the consistent relationship between the crop nutrients, wheat yield and the wheat spectral parameters, satellite remote sensing shows promise as a tool for assessing the variation in soil properties and yield in

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Section: Introductionmentioning

confidence: 99%

The delineation of agricultural management zones with high resolution remotely sensed data

et al. 2009

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“…P recision farming , or site‐specific management, assists growers in making precise management decisions for different cropping systems throughout the world (Koch and Khosla, 2003). Site‐specific management recognizes the inherent spatial variability associated with most fields under crop production (Thrikawala et al, 1999).…”

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confidence: 99%

Economic Feasibility of Variable‐Rate Nitrogen Application Utilizing Site‐Specific Management Zones

et al. 2004

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Variable-rate technology (VRT) has been developed to variablyThe potential for improved profitability due to variapply crop inputs to manage in-field variability. Although growers have able-rate N application depends on identifying areas in begun to adopt VRT, its profitability is uncertain in N management. the field where additional N inputs will increase revenue The objective of this study was to assess the economics of uniform vs. variable-rate N fertilizer application under two N application scenarios on a scale that is greater than the added costs and/or (farmer vs. custom applications). On-farm studies were conducted on identifying areas where reducing N inputs will decrease two continuous corn (Zea mays L.) fields in northeastern Colorado costs on a scale that is greater than potential revenue under furrow and center-pivot irrigation during the 2000 and 2001 reduction correlated with lower grain yield (Snyder et al., growing seasons. The N management strategies were uniform, grid-based, 1999). Therefore, the economic feasibility of variable-rate site-specific management zone-constant yield goal (SSMZ-CYG) and N application is focused on whether increases in gross site-specific management zone-variable yield goal (SSMZ-VYG). "Profit revenue or decreases in N input costs outweigh the added and loss" software was used to analyze the economics of each N cost of technologies or services needed for variable-rate N management strategy and determine which N strategy was most profitapplication ( Ferguson et al., 1999;Thrikawala et al., 1999). Thrikawala et al. (1999) reported that the profitability N fertilizer (6-46%) was used with the SSMZ-VYG N management strategy when compared with uniform N management. Net returns from of variable-rate N application increased above that of the SSMZ-VYG N management strategy were $18.21 to $29.57 ha Ϫ1 uniform N application as area and in-field soil variability more than uniform N management. Results of this study suggest variincreased. However, additional information and appliable-rate N application utilizing site-specific management zones are cation expenses are involved when managing spatial more economically feasible than conventional uniform N application. variability occurring throughout a field. Review of literature suggested that most studies incorporated the information costs (i.e., soil sampling, developing variable-rate able. Results from three site-years consistently indicated that less total

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“…Variable Rate Technology (VRT) is one of the key components of PA. VRT for fertilizer application has been in existence for the past several years and has been developed for a variety of cropping systems (Koch and Khosla, 2003). In essence, VRT sequentially involves assessment of spatial variability of plant and/or soil nutrients, followed by clustering and mapping of nutrient concentrations in relation to crop yields (Balasundram et al, 2008a).…”

Section: Precision Nutrient Managementmentioning

confidence: 99%

Sensor Technologies for Precision Soil Nutrient Management and Monitoring

Mohd¹

2012

American Journal of Agricultural and Biological Sciences

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Problem statement: Growing concerns about the need to increase crop productivity without causing environmental injury have led to the deployment of site-specific strategies in soil nutrient management, where nutrients are applied in variable rates to fit local requirements. Variable rate application of nutrients is typically based on a rigorous sampling regime and time-consuming data analyses. The ability to monitor soil nutrient concentration efficiently is highly desirable. Approach: Onsite monitoring of soil nutrient concentration offers the opportunity for higher density measurements at relatively lower costs. This would allow for an efficient mapping of nutrient variability to facilitate variable-rate nutrient application. Results: Implementation of nutrient management programs using sensor technology potentially promotes environmental stewardship while maintaining crop productivity and profitability. Rapid and non-destructive quantification of spatially-variable soil nutrients has been made possible with on-the-go sensors such as optical, electromagnetic and electrochemical sensors. Conclusion: This review demonstrates the potential of on-the-go sensors for non-destructive and rapid characterization of soil nutrient variability within crop fields.

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The Role of Precision Agriculture in Cropping Systems

Cited by 38 publications

References 18 publications

The delineation of agricultural management zones with high resolution remotely sensed data

The delineation of agricultural management zones with high resolution remotely sensed data

Economic Feasibility of Variable‐Rate Nitrogen Application Utilizing Site‐Specific Management Zones

Sensor Technologies for Precision Soil Nutrient Management and Monitoring

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