학술논문
Soil water extraction by roots and Kc for the coffee crop/Extracao radicular de agua e Kc em cultura de cafe
Document Type
Academic Journal
Author
Source
Revista Brasileira de Engenharia Agricola e Ambiental. May-June, 2009, Vol. 13 Issue 3, p257, 5 p.
Subject
Language
English
ISSN
1415-4366
Abstract
Basic information for a rational soil-water management of the coffee crop is still insufficient, particularly under irrigated conditions. Of great importance for the estimation of water requirements of coffee crops are their root distribuition and evapotranspiration crop coefficients. This study compares soil water extraction by roots of coffee plants of the variety 'Catuai Vermelho' (IAC-44), grown in Piracicaba, SP, Brazil, 3 to 5 years old, with direct measurements of root dry matter, showing a good agreement between both approaches, and confirming that most of the root system is distributed in the top soil layer (0-0.3 m) and that less than 10% of the root system reaches depths greater than 1.0 m. Calculated evapotranspiration crop coefficients are in agreement with those found in the literature, with an average of 1.1, independent of shoot dry matter, plant height and leaf area index. Key words: perenial crop, soil water storage, water balance A informacao basica para o manejo racional de agua e solo na cultura de cafe ainda e insuficiente, sobretudo em condicoes de cultura irrigada. A distribuicao radicular e os coeficientes de cultura para evapotranspiracao sao de grande importancia para a estimativa da necessidade de agua na cultura cafe. Este estudo compara a extracao radicular de agua de plantas de cafe, variedade 'Catuai Vermelho' (IAC-44), cultivado em Piracicaba, SP, Brasil, de 3 a 5 anos de idade, com medidas diretas de material seca de raiz, mostrando boa relacao entre as metodologias e confirmando que a maioria do sistema radicular esta distribuida na camada superficial de solo (0-0,3 m) e que menos de 10% do sistema radicular atingem profundidades maiores que 1,0 m. Os coeficientes de cultura medidos estao de acordo com aqueles encontrados na literatura, com media de 1,1, independentemente da materia seca, altura de planta e indice de area foliar. Palavras-chave: cultura perene, armazenamento de agua no solo, balanco hidrico
INTRODUCTION Coffee is among the most important crops grown in Brazil and, recently, its cultivation reached areas previously considered not adequate due to their pronounced water deficit, which is corrected [...]
INTRODUCTION Coffee is among the most important crops grown in Brazil and, recently, its cultivation reached areas previously considered not adequate due to their pronounced water deficit, which is corrected [...]