Q2. What is the key term in the evaluation of DI strategies?
Crop water productivity (WP) or water use efficiency (WUE), as reviewed by Molden (2003), is a key term in the evaluation of DI strategies.
Q3. What is the common example of a water saving strategy?
For instance, water saved by DI can be used to irrigate more land (on the same farm or in the water user’s community), which – given the high opportunity cost of water – may largely compensate for the economic loss due to yield reduction (Kipkorir et al., 2001; Ali et al., 2007).
Q4. What incentives might be implemented to encourage farmers to implement DI strategies?
In some areas, water markets and other financial incentives might be implemented to encourage farmers to implement DI strategies that will enhance communal production values.
Q5. What is the main advantage of irrigated yields?
irrigated yields can be stabilized at a particular level, guaranteeing a stable income for the farmer and allowing economic planning.
Q6. What is the effect of a common irrigation strategy?
If a common irrigation strategy is adopted in a region, peaks in irrigation water supply will occur during droughtsensitive stages.
Q7. What is the main limiting factor of drought stress?
Since drought tolerance varies considerably by genotype and by phenological stage, DI requires precise knowledge of crop response to drought stress for each of the growth stages (Kirda et al., 1999).
Q8. What is the role of deficit irrigation in agriculture?
Deficit irrigation will play an important role in farm-level water management strategies, with consequent increases in the output generated per unit of water used in agriculture.
Q9. What is the effect of di on quinoa?
Under rain-fed conditions, the crop cycle length of quinoa may increase substantially if severe drought stress occurs before flowering.
Q10. How did the researchers find that quinoa yields were stabilized?
Field experiments conducted in the semi-arid to arid Bolivian Altiplano (Geerts et al., 2006b) found that DI was able to stabilize quinoa yields at a level of 1.6
Q11. What is the reason for the increase in WP?
The literature reviewed suggests that increased WP can be attributed to the following reasons:water loss through evaporation is reduced; the negative effect of drought stress during specific phenological stages on biomass partitioning between reproductive and vegetative biomass (harvest index) (Fereres and Soriano, 2007; Hsiao et al., 2007; Reynolds and Tuberosa, 2008) is avoided, which stabilizes or increases the number of reproductive organs and/or the individual mass of reproductive organs (filling) (Karam et al., 2009); WP for the net assimilation of biomass (Eq. (1), with biomass in the numerator and with Ta in the denominator) is increased as drought stress is mitigated or crops become more hardened.
Q12. What is the CWPs function for sugarbeet?
A convex quadratic CWPs function was reported for lentil (Oweis et al., 2004), cotton (Henggeler et al., 2002), green gram (Webber et al., 2006), soy bean (Sincik et al., 2008) and safflower (Lovelli et al., 2007) in varying locations, while a linear CWPs function with positive extrapolated Y-intercept (cf. Fig. 2a, linear approximation of upper sub-section of d) or a convex quadratic CPWs function was found for sugarbeet (Bazza (1999) and Doorenbos and Kassam (1979), respectively).
Q13. What is the effect of water on the net assimilation of biomass?
This effect is thought to be rather limited given the conservative behavior of biomass growth in response to transpiration (de Wit, 1958; Steduto et al., 2007); WP for the net assimilation of biomass is increased due to the synergy between irrigation and fertilization.