Agricultural Water Management Research Trends by Magnus L. Sorensen, Magnus L. Srensen

By Magnus L. Sorensen, Magnus L. Srensen

Agricultural water administration contains many themes: farm-level and neighborhood water administration, irrigation, drainage, and salinity administration of cultivated parts, assortment and garage of rainfall on the subject of soil houses and plants; the position of groundwater and floor water in nutrient biking, exploitation and security of water assets, keep an eye on of flooding, erosion, and desertification. This ebook offers modern examine from all over the world.

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This model output is qualitative in the sense that it is based on comparison of quantified indicators of the current year with those of the past. It provides information on whether in the current season a given crop deviates from the ‘normal’ growing pattern in terms of biomass and phenological development. These crop indicators are used in combination with regression techniques as a basis for quantitative regional yield prediction for the various crops. The system is operational for the EU and has been installed in various non-EU countries.

A weather generator produces synthetic daily time series of climatic variables statistically equivalent to the recorded historical series, as well as daily site-specific climate scenarios that could be based on regional GCM results (Semenov and Jamieson, 2001). The weather generator usually mimics correctly the mean values of the climatic variables, although underestimates their variability (Mavromatis and Jones, 1998; Semenov and Jamieson, 2001; Wilby and Wigley, 2001). Different weather generators are available, but according to Wilby and Wigley (2001), the US-made and the UK-made WGEN and LARS-WG are the most widely used.

Under conditions wetter than a certain “anaerobiosis point” (h1) water uptake by roots is zero, as well as the coefficient α. Likewise, under conditions drier than “wilting point” (h4), α is also zero. Water uptake by the roots is assumed to be maximal when the soil water pressure-head is between h2 and h3 and hence α-value is one in that case. The values of α decrease linearly with h for h values lower than h4 but larger than h3. According to Leenhardt et al. (1995), the Feddes et al. (1978) root water-uptake model has the advantage that not only considers the crop transpiration reduction due to lower soil-water contents, but also takes in account the negative effect of water excess in the soil root zone.

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