Download Crop-soil simulation models: applications in developing by Robin B Matthews, William Stephens PDF

By Robin B Matthews, William Stephens

This publication, in keeping with paintings subsidized through the ordinary assets platforms Programme of the united kingdom division for foreign improvement, stories growth in crop-soil simulation modelling and assesses its software to agriculture in constructing international locations. The books is split into sections in accordance with a category of types with varied features: these used as instruments via researchers; these used as instruments by means of decision-makers; and people utilized in schooling, education and know-how move. The examples used are almost always from functions of crop versions in constructing international locations, supplemented by way of reviews with tropical vegetation in Australia. the ultimate sections of the e-book talk about no matter if crop versions have proved worthwhile and think about the way in which ahead in crop modelling and alertness. to be had In Print

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E. e. g. ). Of the latter, one of the most serious is the frequent lack of genetic variability in reality of the characters in question. For example, BEANGRO predicts increases in yields with an increase in days to maturity in the absence of temperature or water deficit, but it has been difficult to breed lines that mature later than existing cultivars (White, 1998). Similarly, most models predict that increasing photosynthesis rates will increase yields, but little success has been achieved in practice so far in selecting for genotypes with increased photosynthetic rates.

Matthews In Mali, public investment in irrigation schemes to try to capitalize on the expected high potential yields of rice due to high solar radiation and adequate water have not been as successful as hoped. In an attempt to identify why the expected yields were not being obtained, Dingkuhn and Sow (1997) used the ORYZA_S rice model to study the spatial, seasonal and year-to-year variability of potential rice yields in the region as a function of planting date. Results indicated that potential yields are primarily driven by temperature, and that the major physiological determinants of yield were: (i) crop duration, which is very variable due to flood-water temperature; (ii) leaf area expansion, which is susceptible to chilling; and (iii) spikelet sterility due to heat or chilling.

Crop simulation models could be used to predict plant type and grain/stover ratios, but most models to date do not incorporate aspects of quality such as taste or cooking characteristics. 22 R. 3 G × E Interactions As mentioned in the previous section, the traditional way of evaluating genotypes is through large numbers of METs. However, METs are generally conducted for only a few years, and are unlikely to sample the full range of seasonal variability at a specific location, particularly where temporal variation is high such as at many locations in the semiarid tropics, for example.

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