Relations between relative evapotranspiration and predawn leaf water potential in soybean grown in several locations |
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| Authors: | B Itier D Flura K Belabbes P Kosuth G Rana L Figueiredo |
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| Institution: | (1) Institut National de la Recherche Agronomique, Station de Bioclimatologie, F-78850 Thiverval-Grignon, France;(2) Departement d'Equipement et Hydraulique, Institut Agronomique et Veterinaire Hassan II, Rabat-Instituts, BP 6202, Rabat, Morocco;(3) Division Irrigation, Centre National du Machinisme Agricole du Genie Rural des Eaux et Forets, 361 rue J. F. Breton, F-34033 Montpellier, France;(4) Istituto Sperimentale Agronomico, Celso Ulpiani, I-70125 Bari, Italy;(5) Instituto Superior de Agronomia, Tapada da Ajuda, P-1399 Lisbon, Portugal |
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| Abstract: | Summary The measurement of water consumption in the field is normally restricted to research purposes, although the development of practical field criteria for timing water application is required to improve crop productivity. To develop such criteria irrigation experiments on Soybean were conducted from flowering to grain filling at four locations which differed in their soil properties and the convective contribution of their climates to potential evapotranspiration. The energy balance, predawn leaf water potential (PLWP), soil moisture depletion, and a crop water stress index (CWSI) based on foliage temperature were measured. The range of soil, atmospheric, phenological and irrigation conditions, produced a common, linear relation between relative evapotranspiration (rET) and the logarithm of -PLWP. Correlation with the temperature based CWSI was weak. A similar relation with PLWP for other C3 plants was also derived from data in the literature. This relation could be helpful for irrigation scheduling once the critical values of rET for crop productivity are known. |
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