Crop coefficient, water requirements, yield and water use efficiency of sugarcane growth in Brazil

•We evaluate crop coefficients and evapotranspiration sugarcane based on soil water balance.•Daily ET and WUE are strongly influenced by soil water availability.•We conclude that the productivity increased according to increases in water level.•A correct evaluation of water losses by crops is import...

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Bibliographic Details
Published in:	Agricultural water management Vol. 128; pp. 102 - 109
Main Authors:	da Silva, Vicente de P.R., da Silva, Bernardo B., Albuquerque, Walker G., Borges, Cícera J.R., de Sousa, Inajá Francisco, Neto, José Dantas
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-10-2013 Elsevier
Subjects:	Agricultural and forest climatology and meteorology. Irrigation. Drainage Agricultural and forest meteorology Agronomy. Soil science and plant productions Biological and medical sciences Brazil Coefficients Crops Design engineering Evapotranspiration Fundamental and applied biological sciences. Psychology General agronomy. Plant production Irrigation Physical properties Physics, chemistry, biochemistry and biology of agricultural and forest soils Pivots Rainfall Soil (material) Soil science Soil water content Water and solute dynamics Water balance and requirements. Evapotranspiration Water use South America Brazil America ASW, Brazil, Paraiba ASW, Brazil Rainfall Soil water content Evapotranspiration Monocotyledones Water yield C4-Type Rain Gramineae Angiospermae Water engineering Vegetals Meteorological phenomenon Crop coefficient Soil moisture Property of soil Tropical crop Water use efficiency Physical properties Sugar plant Soil water properties Saccharum officinarum Water requirement Spermatophyta Sugar cane Atmospheric precipitation
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Summary:	•We evaluate crop coefficients and evapotranspiration sugarcane based on soil water balance.•Daily ET and WUE are strongly influenced by soil water availability.•We conclude that the productivity increased according to increases in water level.•A correct evaluation of water losses by crops is important for allocating irrigation water.•The soil water balance method can provide accurate estimates of sugarcane ET. A correct evaluation of water losses as evapotranspiration (ET) by crops is important for allocating irrigation water and improving water use efficiency. Field experiments were conducted throughout 2009/2010 (second ratoon) and 2010/2011 (third ratoon) in a sugarcane field of a commercial distillery located on the coastal area of Paraiba state, Brazil. The main objective of this study was to determine crop coefficient, water requirements and water use efficiency (WUE) of sugarcane grown in a tropical climate. The experimental design was by randomized block design with four irrigation treatments and three replications using two center pivots. Crop evapotranspiration (ET) was determined by field soil water balance and reference evapotranspiration (ETo) was obtained based on Penman–Monteith method (FAO/56), using data of air temperature, relative humidity, wind speed and solar radiation from Data Collection Platform, located next to the experimental site. The experimental area was cultivated with irrigation applied weekly by a center pivot system in addition to rainfall. The irrigation scheduling was based on four irrigation levels (T1=25%, T2=50%, T3=75% and T4=100% of ETo). Results showed that ET and WUE are strongly influenced by soil water availability. When averaged across two years, productivity increased according to increases in water level. Sugarcane ET ranged from 2.7 (rain-fed condition) to 4.2mm day−1 (100% ETo irrigation treatment)
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0378-3774 1873-2283
DOI:	10.1016/j.agwat.2013.06.007