home    about    browse    search    latest    help 
Login | Create Account

Evapotranspiration and crop coefficient for potato in organic farming.

Carvalho, Daniel F. de; Silva, Dione G. da; Rocha, Hermes S. da; Almeida, Wilk S. de and Sousa, Eraldo da S. (2013) Evapotranspiration and crop coefficient for potato in organic farming. [Evapotranspiração e coeficiente de cultivo da batata em sistema agroecológico de produção.] Engenharia Agrícola, 33 (1), pp. 201-211.

[img]
Preview
PDF - Published Version - English
286kB

Online at: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100020&lng=pt&nrm=iso&tlng=en

Summary

The aim of this study was to quantify the water consumption and the crop coefficients (Kc) for the potato (Solanum tuberosum L.), in Seropédica, Rio de Janeiro (RJ), Brazil, under organic management, and to simulate the crop evapotranspiration (ETc) using the Kc obtained in the field and the ones recommended by the Food and Agriculture Organization (FAO). The water consumption was obtained through soil water balance, using TDR probes installed at 0.15m and 0.30m deep. At the different stages of development, the Kc was determined by the ratio of ETc and reference evapotranspiration, obtained by Penman-Monteith FAO 56. The crop coefficients obtained were 0.35, 0.45, 1.29 and 0.63. The accumulated ETc obtained in the field was 109.6 mm, while the ETc accumulated from FAO's Kc were 142.2 and 138mm, respectively, considering the classical values and the values adjusted to the local climatic conditions. The simulation of water consumption based on meteorological data of historical series from 1961 to 2007 provided higher value of ETc when compared with the one obtained in the field. From the meteorological data of historical series, it was observed that the use of Kc recommended by FAO may overestimate the amount of irrigation water by 9%, over the same growing season.

Summary translation

O trabalho foi desenvolvido visando a quantificar, sob manejo agroecológico, o consumo hídrico e os kcs para a cultura da batata (Solanum tuberosum L.), em Seropédica (RJ), e a simular a evapotranspiração da cultura (ETc), utilizando os kcs obtidos e os kcs preconizados pela FAO. O consumo hídrico foi obtido por meio do balanço hídrico do solo, utilizando sondas de TDR instaladas a 0,15 e 0,30 m de profundidade. Nas diferentes fases de desenvolvimento, o kc foi determinado pela razão entre a ETc e a evapotranspiração de referência, obtida por Penman-Monteith FAO 56. Os kcs obtidos foram 0,35; 0,45; 1,29 e 0,63. A ETc acumulada obtida em campo foi de 109,6 mm, enquanto as ETcs acumuladas a partir dos kcs FAO foram de 142,2 e 138,0 mm, respectivamente, considerando os valores clássicos e os corrigidos para as condições climáticas locais. A simulação do consumo hídrico com base nos dados meteorológicos da série histórica de 1961 a 2007 proporcionou valor maior de ETc quando comparado ao obtido em campo. A partir dos dados meteorológicos obtidos na série histórica, observou-se que a utilização de kcs preconizados pela FAO pode superestimar a quantidade de água na irrigação em 9%, considerando o mesmo período de cultivo.

EPrint Type:Journal paper
Keywords:Solanum tuberosum L., Reflectometria no domínio no tempo, Irrigação. Solanum tuberosum L., Time domain reflectometry, Irrigation.
Agrovoc keywords:
LanguageValueURI
Englishagroecologyhttp://aims.fao.org/aos/agrovoc/c_92381
EnglishSolanum tuberosumhttp://aims.fao.org/aos/agrovoc/c_7221
EnglishIrrigationhttp://aims.fao.org/aos/agrovoc/c_3954
EnglishTime domain reflectometryhttp://aims.fao.org/aos/agrovoc/c_36856
EnglishPlant water relationshttp://aims.fao.org/aos/agrovoc/c_16147
Englishwater balancehttp://aims.fao.org/aos/agrovoc/c_8311
Subjects: Crop husbandry > Production systems
Farming Systems > Farm economics
Farming Systems
Farming Systems > Farm nutrient management
Crop husbandry > Production systems > Root crops
Research affiliation: Brazil > Embrapa - Brazilian Agricultural Research Corporation
Brazil > Other organizations
ISSN:0100-6916
DOI:10.1590/S0100-69162013000100020
Related Links:http://www.scielo.br/?lng=pt
Deposited By: Sartor, Luana Alessandra
ID Code:28510
Deposited On:22 Apr 2015 20:00
Last Modified:22 Apr 2015 20:00
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page