Variety selection (late varieties) Sample Clauses

Variety selection (late varieties). As previously mentioned, a linear crop growth model based on the “growing degree days” (GDD) approach has been used to compute the length of the stages for a given variety type and under the average monthly thermal conditions of given climate scenarios. The model has been applied also to evaluate the shortening of the growing cycle duration under “future” scenarios (with respect to the “present” one) due to the relative increase in temperature and GDD accumulation for each crop. As a consequence, a reduction in crop evapotranspiration and yield is expected, due to the shorter available time for biomass accumulation and the relative reduction in plant transpiration (Xxxxxxx et al. 2000). In the case of field crops, slower‐maturing (late) varieties are then suggested to counterbalance the reduction of potential crop yield. To simulate the behaviour of ‘new’ adapted genotypes under “future” climate conditions, the basic GDD values (as presented in paragraph 2.4) have been increased by 10%, while the duration of the singular stages have been maintained in similar proportion to those defined for the original variety (Xxxxxxx et al. 2000; Xxxxxxxx et al., 2000). Tab. 10 – Modified values of GDD sum required for the simulation of wheat, maize, tomato and potato development (late variety type). Crop Modified GDD sum (°C) (initial) (development) (mid‐season) (late) Wheat 275 1375 2090 2750 Tomato 110 550 990 1320 Potato 165 605 1320 1760 Maize 110 715 1430 1760 With this choice, the total cropping cycle length of the adapted varieties under “future” climate has been found to be quite always comparable in length to that of the ones used under “present” climate conditions. The relative effect of this strategy on both crop water requirements and yield has been assessed.
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