Quantitative Approach for Irrigation Requirement of Oil Palm: Case Study in Chuping, Northern Malaysia

Abstract

The right decision is needed before the irrigation project starts because it is risky, costly and required a sitespecific approach. The study aims to estimate oil palm irrigation water demand by using FAO-CROPWAT model. Study was conducted in Chuping Region, Northern Peninsular of Malaysia. Four points were selected to represent North, East, West and South for soil sampling. The samples were sent to a laboratory to measure the water content after pressure applied at 0, 1, 10, 33 and 1500 kPa. Total available water holding capacity was found at 105-227 mm for 100 cm soil depth and the lowest value was selected to be used in FAO-CROPWAT model, developed by Land and Water Development Division of Food and Agriculture Organisation of the United Nations (FAO). Prior to that, history of 14 years of monthly meteorological data were collected and serve as climatic data for potential evapotranspiration calculation. Based on the simulation, crop evapotranspiration (ETc) and irrigation requirement (IR) was 1175 and 255.2 mm yr-1 respectively. Total net irrigation was concluded at 132 mm yr-1 with the assumption of 80% irrigation efficiency and 5.0 mm of irrigation input. Through this study, FAO-CROPWAT found to be a suitable approach to estimate crop water requirement (CWR) for oil palm and simulate irrigation scheduling for the entire year. It can help to strategise the management plan prior to any irrigation project design and increase potential for good economic return.

Vegetation Effects on Soil Moisture Retrieval from Water Cloud Model Using PALSAR-2 for Oil Palm Trees

“…In the research site, the soil type was identified as Chuping and Dampar soil series, where the Chuping soil type is categorized as sandy clay loam with a hue of 7.5-10 YR (Yellow to Red) following the Munsell color chart standards, and the latter soil type was identified as clay loam with a hue of 7.5 YR [62]. The site was considered flat topography with an elevation of 21.6 m while the slope class was identified as 4-12% [63]. As per the study site, the months of February to March of the calendar year are regarded as the driest season of the year; with a maximum of 28 days of dry spell every year and an average of 1362.38 mm of precipitation per year in the years of 2015-2017 [64].…”