Tag: Irrigation
Long-Term Evapotranspiration from Coastal Avocado/Citrus Orchard
Very limited citrus and avocado orchard evapotranspiration data are available, and practically no published information is available considering citrus/avocado evapotranspiration ETc on steeply sloping fields in coastal climates. Often the data available are from measurements based on limited time periods, and season-to-season orchard water use variability is unknown. The objective of this project was to obtain such long-term-field ETc data. Of particular interest was determination of the monthly
Responses of avocado production to variation in irrigation levels
The effects of four irrigation regimes on fruit production and size were evaluated for three seasons in a mature ‘Hass’ avocado orchard (Persea americana Mill.). The research was conducted in Chile’s Central Valley on a clay loam soil at the surface and sandy loam from 0.3 to 0.9 m. Climate zone is sub-humid, Mediterranean-type. A completely randomized block design was used with four applied water treatments (25, 50, 75, and 100% of reference evapotranspiration, ETo), estimated on the basis
Different levels of water and fertilizer application in 'Hass' avocado trees during four seasons in the Peumo Valley of Chile
A research study was carried out during four seasons between December 2003 to May 2007, in five years old ‘Hass’ avocado trees (Persea americana Mill.) in the Peumo Valley, Chile. Its objective was to analyze the effects of two doses of fertilizer and four differential levels of water application (25, 50, 75 and 100% of the theoretical water volume required by the plant) on the production and quality of the fruit. A split-plot experimental design with allocation in completely randomized blocks
Water savings, nutrient leaching, and fruit yield in a young avocado orchard as affected by irrigation and nutrient management'
This project was designed to determine the effect of fertilizer rate and irrigation scheduling on water use, nutrient leaching, and fruit yield of young avocado trees (Persea americana Mill. cv. Simmonds). Seven nutrient and irrigation management practices were evaluated: (1) irrigation based on crop evapotranspiration (ET) with 50% fertilizer at a standard rate (FSR); (2) ET irrigation with FSR (typical for avocado production in the area); (3) ET irrigation with 200% FSR; (4) irrigation based on
Water use of an intermediate and a mature avocado orchard
The scarce water resources in South Africa are vulnerable to the increasing pressure of a changing climate. The recent drought experienced in South Africa (2014-2017) has negatively affected the fruit industry, highlighting the need to optimise water use efficiency (WUE) as well as accurately estimate water use. With avocado production in South Africa being export-oriented and dependant on irrigation, proper water management is vital to minimising water use, while maintaining fruit yield and quality.
An irrigation schedule testing model for optimization of the Smartirrigation avocado app
A series of mobile irrigation apps have been developed on the basis that irrigation schedules can be estimated using an average of the previous five days of crop evapotranspiration (ETc). The application of this average ETc methodology for developing an irrigation schedule has not been fully evaluated for the suite of apps, including the avocado app. Thus, an irrigation testing model was developed and is presented here that simulates irrigation depths based on the Smartirrigation avocado app operation