Crop growth rate is a mechanism used to assess the growth of plants, for which Net Assimilation Rate is the important criterion where increase in weight per unit of leaf area and time is assessed. For this purpose we need to identify spatial and temporal integration of plant processes, rate of dry matter accumulation at different stages of crop cycle. There is also need to quantify the effects of environmental influences and GxE interaction, daily performance measurement of crop canopy. If we consider all these points, CGR can be calculated for different crops. CGR has been worked out for several crops, we need to scan literature. In specific there are many areas for future research.
but I wanna know the max of quantity of CGR in c3,c4 cam?
for example ;g / m2/day
c3 = 20-30
c4 = 30-70
cam = 10-15
Do you think are they correct?
Appreciate for your useful information
But as you know it is not complete answer
Compliments to Hesam for a good reply. Thank you Alireza for insights on CGR.
We can often find values of up to 30 g/m2/day in C3 crops, higher values are rare, at least over longer periods, so 20-30 are realistic in practice. The values for C4 plants are higher, but 70 g/m2/day seem very high. I have less experience with C4 crops, but as far as I understand, 50 would be a more realistic value than 70.
While the optimum productivity for plants of different photosynthesis types is fascinating we must not forget that a C3 crop can be highly efficient in low temperature regimes as winter annuals and C4 metabolism is more a tropical adaptation. CAM crops do not appear high productive compared to C3 and C4 but are more conservative of scarce water. In terms of productivity C3 plants can be more digestible than many C4 plants. If we think concentrating on C4 metabolism will resolve our food and productivity challenges it might be a bridge too far. Some thoughts.
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