Evaluating Farmer Developed Management Zone Maps for Precision Farming

Fleming, Kim; Westfall, D. G.; Wiens, D. W.; Rothe, Larry E.; Cipra, J. E.; Heermann, Dale F.

doi:10.2134/1999.precisionagproc4.c29

Cited by 27 publications

(14 citation statements)

References 2 publications

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“…Available water-holding capacity (AWC) of soil is the maximum amount of water accessible to crops in the root zone [3]. Hence, a precise delineation of sub-field areas possessing similar characteristics, such as delineating site-specific management zones (SSMZ) [4,5], is key to precise irrigation management [6]. For precision irrigation, delineating SSMZ relies on soil hydraulic properties, which define the optimal soil water parameters for each zone [7].…”

Section: Introductionmentioning

confidence: 99%

Characterizing Spatial Variability in Soil Water Content for Precision Irrigation Management

2018

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Among one of the many challenges in implementing precision irrigation is to obtain an accurate characterization of the soil water content (SWC) across spatially variable fields along the crop growing season. The accuracy of characterizing SWC has been tested primarily on a small-scale and has received little attention from the scientific community at the field scale. Hence, the objective of this study was to assess the characterization of the spatial distribution of soil water content at the field scale by the apparent electrical conductivity (ECa). In evaluating the current aim, ECa survey was compared against repeated measurements of SWC at five depths using neutron probe. Results showed that mean SWC was different across ECa derived management zones, which indicates that on a macro-scale, soil ECa could effectively characterize the mean differences in SWC across management zones. Results also showed that deep ECa (0-150 cm) survey outperformed shallow survey (0-75 cm). Considering other soil properties, such as organic matter content and salt content, further improved the relationship between SWC and ECa.

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Section: Introductionmentioning

confidence: 99%

Characterizing Spatial Variability in Soil Water Content for Precision Irrigation Management

2018

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“…Application of nutrients to soil using MZs has shown to improve nutrient use efficiency, maintain or increase grain yield, and potentially reduce environmentally sensitive nutrient loading (Khosla et al, 2002; Hornung et al, 2003). The use of MZs in managing spatial variability has been proposed as a cost effective approach to using spatial information for improved crop management (Fleming et al, 1999; Luchiari et al, 2001; Koch et al, 2004).…”

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confidence: 99%

Precision Manure Management across Site‐Specific Management Zones: Grain Yield and Economic Analysis

et al. 2014

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Precision manure management is a relatively new concept that merges the best agronomic and manure management practices along with precision agricultural techniques, such as site-specific management zones (MZs), for agricultural productivity and environmental quality. The objective of the study was to assess the influence and compare the economic efficiency of variable-rate applications of animal manure on grain yield in maize (Zea mays L.) fields across MZs in limited irrigation cropping systems. The study was conducted on furrow-irrigated maize fields in northeastern Colorado, USA. Fields were classified into low, medium, and high yielding MZs, based on soil color, elevation, and yield history. Experimental strips were 4.5 m wide and 540 m long spanning across all MZs with manure and N fertilizer management strategies nested within MZs. Variable-rate manure applications of 22, 44, and 67 Mg ha -1 were considered for variable yield goal (VYG) and constant yield goal (CYG) manure management strategies. The results of this study indicates that maize grain yield was significantly different across MZs a majority of times, however, not always consistent with the MZ productivity level. For instance, the low MZ showed a significantly (P £ 0.05) higher grain yield under a CYG manure management strategy. The enterprise budget analysis indicated that application of animal manure alone was economically inefficient for maize grain production. The study suggests that variable-rates of manure can be used in conjunction with synthetic N fertilizer to ensure that crop N requirements are met at early growth stages of maize.

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“…No entanto a relação entre CEa e produtividade não é simplesmente linear. Outros autores também realizaram pesquisas investigando a relação entre a CEa do solo e a produtividade (Fleming et al, 1998). Johnson et al (2001) observaram correlação negativa entre a produtividade e a CEa do solo.…”

Section: Unidades De Gerenciamento E Condutividade Elétricaunclassified

Definição de unidades de gerenciamento do solo por meio da sua condutividade elétrica e variáveis físico-químicas.

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Dedico ao meu pai, Antônio Maria Gomes de Castro, e a minha mãe, Maria Zélia Nunes de Castro, por terem me dado o apoio e as condições necessárias para ser quem hoje sou e superar os desafios que me foram propostos durante a elaboração desse trabalho. Dedico aos meus irmãos Cristiano Nunes de Castro e Claúdia Nunes de Castro pelos quais eu tenho tanto apreço e que sei que "torcem" por mim tanto quanto eu torço por eles. Dedico ao meu orientador José Paulo Molin que tão bem me aconselhou durante o curso de mestrado, que me orientou durante a confecção desta dissertação e cujos conselhos foram de grande valia em tornar o caminho, por vezes "tortuoso", do aprendizado científico em algo um pouco mais "retilíneo" para que este inexperiente aprendiz da investigação científica tivesse uma melhor jornada. AGRADECIMENTO Agradeço ao Eng. Agronômo Leandro Maria Gimenez, pesquisador da Fundação ABC, que tanto auxiliou nas etapas de coleta dos dados que foram utilizados nesta pesquisa e que sem o seu suporte em Castro muito prejudicaria o bom andamento das tarefas requeridas para conclusão deste trabalho. Agradeço aos demais funcionários da Fundação ABC que auxiliaram nas etapas de coleta de dados deste trabalho. Agradeço aos funcionários do Departamento de Engenharia Rural da ESALQ-USP que atenciosamente sempre me auxiliaram em preparar os equipamentos que seriam utilizados nas pesquisas de campo. Especial agradecimento

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Evaluating Farmer Developed Management Zone Maps for Precision Farming

Cited by 27 publications

References 2 publications

Characterizing Spatial Variability in Soil Water Content for Precision Irrigation Management

Characterizing Spatial Variability in Soil Water Content for Precision Irrigation Management

Precision Manure Management across Site‐Specific Management Zones: Grain Yield and Economic Analysis

Definição de unidades de gerenciamento do solo por meio da sua condutividade elétrica e variáveis físico-químicas.

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