Robust Estimates of Evapotranspiration for Sugarcane
نویسندگان
چکیده
In both Australia and Swaziland large areas of sugarcane rely on irrigation to produce a viable crop or to improve rainfed productivity. Matching water supply to crop demand is essential for productivity and sustainability in any irrigation scheme. Historically Class-A pan evaporation was used as a basis for determining sugarcane water demand or evapotranspiration (ETc). ETc is now frequently obtained using simulation models like CANEGRO (McGlinchey and Inman-Bamber, 1996) and APSIM (Keating et al., 1999). Another approach now endorsed by the United Nations Food and Agriculture Organisation (FAO) is to base ETC on reference evapotranspiration (ET0) estimated using the Penman-Monteith equation and crop-specific coefficients (Kc) which are used to convert ET0 to ETC for a particular crop at a particular stage of development (FAO 56; Allen et al., 1998). Both the CANEGRO and FAO methods utilize the Penman-Monteith equation to estimate atmospheric demand. In Swaziland a sugarcane reference evapotranspiration estimate (ETcane), derived from CANEGRO, is used extensively to schedule irrigation. In contrast the APSIM-Sugarcane model uses a transpiration use efficiency concept (TUE) to estimate ETc from the increment in above-ground biomass and vapour pressure deficit (VPD).
منابع مشابه
Comparisons Measured Evapotranspiration of Sugarcane from Large a N D Small Lysimeters
Evapotranspiration (E,) was estimated for plant, first ratoon and second ratoon crops in a sugarcane field by means of the water balance in a large plastic-lined lysimeter (405 m2) and three small weighed lysimeters (each 3,71 m2). For the first 230 days of the plant crop of the experiment the mean daily estimates of E , from the large and small lysimeters were 4,14 mm and 4,16 mm respectively....
متن کاملA MODIS-Based Energy Balance to Estimate Evapotranspiration for Clear-Sky Days in Brazilian Tropical Savannas
Evapotranspiration (ET) plays an important role in global climate dynamics and in primary production of terrestrial ecosystems; it represents the mass and energy transfer from the land to atmosphere. Limitations to measuring ET at large scales using ground-based methods have motivated the development of satellite remote sensing techniques. The purpose of this work is to evaluate the accuracy of...
متن کاملComparison of different empirical methods for estimating ddaily reference evapotranspiration in the humid cold climate (case study: Borujen, Shahrekord, Koohrang and Lordegan)
The proposed method for calculation of potential evapotranspiration is Penman-Monteith FAO method, but there are other methods that require less meteorological data but estimates close to the FAO Penman-Monteith method in different climatic conditions. Performance evaluation of these methods on the same basis is prerequisite for selecting an alternative approach in accordance with available da...
متن کاملThe effect of crop residue layers on evapotranspiration, growth and yield of irrigated sugarcane† FC Olivier* and A Singels
A layer of harvest residues from the previous crop can reduce wasteful evaporation from the soil surface and thereby increase the efficiency of use of limited water resources for agricultural production. The practice of harvesting sugarcane green and leaving crop residues in the field, as opposed to burning the residue, has been re-adopted in many sugarcane industries worldwide. However, a bett...
متن کاملClimate change would enlarge suitable planting areas of sugarcanes in China
China’s sugar production and consumption continues to increase. This process is alreadyongoing for over 15 years and over 90% of the sugar production comes from sugarcane(Saccharum officinarum). Most of the sugarcane is planted in the south (e.g. the Chineseprovinces of Yunnan, Guangxi, Guangdong and Hainan) and it represents there a majoreconomic crop in these landscapes. As found virtually wo...
متن کامل