Use of soil and vegetation spectroradiometry to investigate crop water use efficiency of a drip irrigated tomato |
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| Affiliation: | 1. Department of Agricultural, Environmental and Food Sciences (DAEFS), University of Molise, Via De Sanctis, I-86100 Campobasso, Italy;2. Department of Economics and Statistics, University of Study of Napoli Federico II, via Cintia 26, 80126 Napoli, Italy;3. Department of Geological Sciences, Michigan State University, 206 Natural Science Building, East Lansing, MI 48824-1115, United States;4. CNR — Institute for Mediterranean Agriculture and Forest Systems (ISAFoM), via Patacca 85, 80056 Ercolano, Italy;1. Research Centre for the Management of Agricultural and Environmental Risks (CEIGRAM), Technical University of Madrid (UPM), Spain;2. Agricultural Systems Group, Dpto. Producción Vegetal: Fitotecnia, E.T.S. Ingenieros Agrónomos, Universidad Politécnica de Madrid, Avda. Complutense s/n, 28040 Madrid, Spain;3. Statistical Support Service, Consejo Superior de Investigaciones Científicas (CSIC), Spain;1. Università degli Studi di Milano, Department of Agricultural and Environmental Sciences, Cassandra lab, via Celoria 2, 20133 Milan, Italy;2. Institute of Agricultural Economics and Information, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, People''s Republic of China;1. Lincoln University, PO Box 7647, Lincoln, Christchurch 7647, New Zealand;2. Lincoln Agritech Ltd., PO Box 69133, Lincoln, Christchurch 7640, New Zealand;3. The University of Queensland, Gatton QLD 4343, Australia;1. North Carolina State University, Raleigh, NC, USA;2. Montpellier SupAgro, Montpellier, France |
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| Abstract: | An agronomic research was conducted in Tuscany (Central Italy) to evaluate the effects of an advanced irrigation system on the water use efficiency (WUE) of a tomato crop and to investigate the ability of soil and vegetation spectroradiometry to detect and map WUE. Irrigation was applied following an innovative approach based on CropSense system. Soil water content was monitored at four soil depths (10, 20, 30 and 50 cm) by a probe. Rainfall during the crop cycle reached 162 mm and irrigation water applied with a drip system amounted to 207 mm, distributed with 16 irrigation events. Tomato yield varied from 7.10 to 14.4 kg m−2, with a WUE ranging from 19.1 to 38.9 kg m−3. The irrigation system allowed a high yield levels and a low depth of water applied, as compared to seasonal ET crop estimated with Hargraves’ formula and with the literature data on irrigated tomato. Measurements were carried out on geo-referenced points to gather information on crop (crop yield, eighteen Vegetation indices, leaf area index) and on soil (spectroradiometric and traditional analysis). Eight VIs, out of nineteen ones analyzed, showed a significant relationship with georeferenced yield data; PVI maps seemed able to return the best response, before harvesting, to improve the knowledge of the area of cultivation and irrigation system. CropSense irrigation system reduced seasonal irrigation volumes. Some vegetation indexes were significantly correlated to tomato yield and well identify, a posteriori, crop area with low WUE; spectroradiometry can be a valuable tool to improve irrigated tomato field management. |
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| Keywords: | Tomato yield Water use efficiency Vegetation indices Irrigation management |
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