What is the net assimilation rate?
A USEFUL measure of the photosynthetic efficiency of plants is ‘net assimilation rate’ (E) defined by Gregory1 as the rate of increase of dry weight (W) per unit of leaf area (L); that is: In measuring W the plant is destroyed, so changes in W can be determined only by successive sampling from a population of plants.
How is net assimilation rate calculated?
Net assimilation rate (g m−2 day−1) Plant height (m)
What is the formula of crop growth rate?
Crop growth rate: it is measured as mass increase in crop biomass per unit ground area per unit time. C ̅ = (1/P) x (W2-W1) / (t2-t1).
What is CGR in agriculture?
Leaf area ratio (LAR) 1. Crop growth rate (CGR):- Crop growth rate (CGR) is the gain in dry matter production on a unit of land in a unit of tune.
What does net assimilation mean?
a measurement of plant growth (weight increase per unit time) by assessing change in a particular part of the plant (usually leaf area) rather than in the overall plant.
What is crop growth rate?
Relative Growth Rate (RGR): Crop growth rate is a measure of the increase in size, mass or number of crops over a period of time. The increase can be plotted as a logarithmic or exponential curve in many cases.
How do you calculate the relative growth rate of a plant?
In classical growth analysis, relative growth rate (RGR) is calculated as RGR = (ln W2 – ln W1)/(t2 – t1), where W1 and W2 are plant dry weights at times t1 and t2.
What is crop growth rate and relative growth rate?
Growth analysis parameters like crop growth rate (CGR) are product of LAI. Relative growth rate (RGR) measures the increase in dry matter with a given amount of assimilatory material at a given point of time and net assimilation rate (NAR) is the net gain in total dry matter per unit leaf area per unit time.
How is RGR calculated?
How is CGR calculated?
To calculate the CAGR of an investment:
- Divide the value of an investment at the end of the period by its value at the beginning of that period.
- Raise the result to an exponent of one divided by the number of years.
- Subtract one from the subsequent result.
- Multiply by 100 to convert the answer into a percentage.
What is relative growth rate in plants?
Relative growth rate (RGR), or the rate of accumulation of new dry mass per unit of existing dry mass, is a major determinant of plant competitiveness. RGR is an indirect measurement of the rate of resource acquisition, and numerous studies have found that increasing crop RGR increases weed suppression (Didon, 2002).
What is net assimilation rate?
net assimilation rate. a measurement of plant growth (weight increase per unit time) by assessing change in a particular part of the plant (usually leaf area) rather than in the overall plant.
How is the net assimilation rate of a plant calculated?
This is an index of the productive efficiency of plants calculated in relation to total leaf area. It is synonymous with the term net assimilation rate. The usual symbol is E: the rate of dry weight production expressed per unit of total leaf area, LA. Its dimensions are mass per area per time, typically mg mm −2 day −1 or g m −2 day −1.
What was the shift from relative growth to net assimilation rate?
The shift from plant growth analysis based on relative growth rate and its components, that is, net assimilation rate and leaf area ratio, to crop growth analysis based on capture and efficiency in the use of resources was a milestone in crop physiology (Monteith, 1994 ).
What is the net assimilation rate of groundnut?
Rao (1999) in his study reported that both HTs (40 vs. 35 °C) and CO 2 (660 vs. 330 ppm) significantly increased the net assimilation rate (NAR) of groundnut. At 330 ppm CO 2, NAR increased from 4.092 to 4.328 g m − 2 day − 1 with the increase in temperature from 35 to 40 °C.