Canopy temperature of high-nitrogen water-stressed cotton
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Frequently Asked Questions (18)
Q2. How many infra-red thermometers were used to monitor Tc?
A total of 18 wireless, solar-powered, infra-red thermometers (ARDUCrop, CSIRO, Canberra, Australia) were used to continuously monitor Tc from first square (40 DAS) to flowering (86 DAS).
Q3. What was the effect of high nitrogen on the canopy temperature?
In the field, under furrow-irrigated growing conditions plants supplied higher/excessive nitrogen, marked by no difference in lint yield and fibre quality, had warmer Tc.High nitrogen stimulated growth and altered leaf gas exchange with subsequent effect on canopy temperature.
Q4. What is the effect of adding a spline term on the tc?
Day was fitted as a covariate to model any linear trends in the data and both a sin and cosine term was included to model the overall diurnal pattern of Tc. Adding a spline term accounts for day-to-day smooth variation in Tc.
Q5. How many leaves were collected in a water stress regime?
Leaf ABA, ABA-GE and phaseic acidEighteen young unfurled leaves, one per block per treatment, were collected on day 7 of a water stress regime before pots were watered, to measure ABA, ABA-GE, and phaseic acid.
Q6. How long did the plant stay well-watered?
After the first 7-day stress, plants were kept well-watered for the next seven days to encourage recovery from stress before reinitiating a second 7-day period of water stress.
Q7. How many seeds were sown in the glasshouse?
Glasshouse experimental design and crop husbandryAbout 25 seeds of cotton (Gossypium hirsutum L. cultivar Sicot 71BRF) were sown into 8 L plastic pots (0.25 m in diameter) filled with soil.
Q8. How was the leaf water potential determined?
One youngest fully expanded leaf (from the terminal bud of the main stem) per experimental unit was used to determine solar noon leaf water potential (ψleaf) according to Scholander et al. (1965).
Q9. How long did the nitrogen treatment take to grow?
The application of the nitrogen treatment to the 200 and 300 N plants at 60 DAS resulted in significant growth as soon as five days after application of N (data not shown).
Q10. What was the main effect of water and nitrogen on photosynthesis?
For photosynthesis, main effects of water and nitrogen were both significant (P<0.001 for water and P=0.005 for nitrogen) whereas for transpiration only the main effect of water was significant (P<0.001).
Q11. What does the author acknowledge that the water stress imposed in the glasshouse does not fully represent?
The authors acknowledge that the water stress imposed in the glasshouse does not fully represent conditions experienced in the field, including, for example, the absence of wetting and drying cycles.
Q12. What are the effects of increased nitrogen supply on plant growth?
under water deficit stress the effects of increased nitrogen supply were limited to structural properties (i.e. formation of leaf tissues, Figure 3).
Q13. Why is the increased Tc observed in the cotton field?
The authors recommend that future studies should investigate whether the cause of the observed increased Tc is solely due to increased plant water demand associated with larger plants.
Q14. What is the effect of nitrogen on cotton lint quality?
Irrespective of nitrogen supplied, lint quality was within the desired range for micronaire (3.8 to 4.5), close to the target fibre length of Australian breeding projects (32 mm) and similar to that of premium fibre grown under the same environmental conditions for other fibre quality characteristics (Clement et al., 2012, 2014; Constable et al., 2015).
Q15. What is the impact of the Tc based irrigation system?
These results have implications for the Australian furrow irrigated cotton system, which is beginning to adopt the Tc based irrigation scheduling system.
Q16. What is the reason for the increase in lint yield?
In addition, future field studies should confirm if the lack of lint yield and fibre quality response to nitrogen is associated with increased plant biomass and water use.
Q17. What was the effect of water and nitrogen interaction on stomatal conductance?
The effect of water and nitrogen interaction was significant for stomatal conductance (P=0.034), marginal for photosynthesis (P=0.052) and not significant for transpiration (P=0.487) in Experiment The author(Figure 4).
Q18. What is the effect of ABA on stomatal conductance?
It has been suggested that xylem sap ABA has better control of stomatal conductance than bulk leaf tissue ABA (Saradadevi et al., 2016) because it is thought that the effect of ABA on stomatal conductance is driven by the accumulation of apoplastic ABA (Sirichandra et al., 2009).