Comparison of Reference Evapotranspiration Estimates Obtained by Different Methods in Relation to the Penman-Montheith Method in Cerrado Environment, Brazil
Journal Title: Journal of Experimental Agriculture International - Year 2017, Vol 17, Issue 1
Abstract
Water is the most limiting resource for crop production, however, erroneous estimates of the amount needed to be applied can increase production costs, influence plant nutrition and contaminate the ecosystem. Thus, the objective of this work was to compare the values of Et0 obtained by the methods of Blaney-Criddle, solar radiation and Ivanov with the values resulting from the use of Penman-Monteith method in cerrado environment, Brazil. To estimate evapotranspiration values were used the daily data of the maximum and minimum temperatures, wind speed, amount of daylight hours and relative humidity of the years of 2010 and 2011. To compare the estimated values, the parameters of the regression equation a and b, coefficient of determination (r²), correlation coefficients (r), agreement (d) and confidence (c) were considered. Based on the Penman-Monteith method, it was verified that all the other methods evaluated overestimate the values of Et0 during the whole evaluated period. Despite this, it was founded a good correlation between the Blaney-Criddle method and the Penman-Montheith method. The solar radiation and Ivanov methods presented low coefficient of determination when compared to the PNM method. It was concluded that the reference evapotranspiration, on a daily scale, can be quantified using the Blaney-Criddle method instead of the Penman-Monteith method. Furthermore, the solar radiation and Ivanov methods, despite the good agreement and performance indexes, present the greatest distortions during the year.
Authors and Affiliations
E. M. Biesdorf, M. F. F. Teixeira, J S. Teixeira, P. H. H. Salla, L. D. Pimentel, H. M. A. Imbuzeiro
Keywords
Related Articles
- EP ID EP315384
- DOI 10.9734/JEAI/2017/34898
- Views 106
- Downloads 0
Evaluation of Integrated Nutrient Management for Mandarin Orange Production in Hot Humid Region of Bangladesh
The study was aimed at boosting up the yield and profitability of mandarin orange cultivation through integrated nutrient management. The experiment consists of six treatments laid out in a randomized complete block desi...
Immobilization of Fluoride in Soils through Soil Properties - A Review
Fluoride (F) is one of the elements that are important in dental and skeletal formation in human beings. If present at optimal levels, it plays a very important role of preventing dental carries. However, its excessive u...
Nitrogen Use and Assimilate Partitioning Ability for Grain Yield in Some Selected Maize (Zea mays L.) Inbred Lines Genotypes
Breeding for high grain yield in maize under natural soil Nitrogen condition is of high importance to reduce the heavy usage of nitrogen base fertilizer to enhance productivity and encourage safety of the environment and...
Colloidal Stability and Potential Structural Deformation Index of Four Nigerian Soils
This study was undertaken to evaluate the effect of continuous cultivation on the colloidal stability and potential structural deformation index (PSDI) of four Nigerian soils. The four soils used for the study were; Enti...
Evaluating the Impacts of Land Degradation on the Quality of Soils and Their Variations between Different Clusters in Mosiro Irrigation Scheme, Narok County, Kenya
Aims: To study the impact of land degradation on soil quality Study Design: Comparative analysis of soil quality indicators in year 2002 and 2013 in Mosiro Irrigation Scheme. Methodology: Changes in soil indicators dete...