There are different phenological stages exist of crop from growing stage to emergence , tillering,flowering,grain setting to maturity. How to determine the duration of each stage if we have total growing days e.g if I have total 150 days of wheat crop and I want to find duration of each growing stages. Moreover there are four growth stages according to FAO like initial,development,mid and late stages. How we can map these four stages with phenological stages?
You can have a look at this file recommended by FAO (see Table 11).
Have a vultures eye in field supported by associated physiological changes would strengthen your study. Good curious question....
Hi Gitika Sharma ,
The ff pdf may help to have some information on wheat growth stages.
https://mccracken.ca.uky.edu/files/identifying_wheat_growth_stages_agr224.pdf
Hi Gitika
There exist several different systems for the classification of growth stages. I would recommend to use the BBCH scale (Lancashire et al., 1991; Annals of Applied Biology), which is a uniformed version of the code for cereals by Zadoks et al (1974; Weed Research). This system allows you to classify the growth stages relatively easy and accurately in the field (see DOI: 10.5073/20180906-074619 for detailed information on several crops). To answer your question on how to get the duration of specific phenological stages: First of all you need to frequently rate the growth stage of your crop. The frequency of your rating is mainly determined by the accuracy you want to obtain, the current growth stage and the environmental conditions. From these ratings you then infer the phenological phase you are interested in. For example in wheat, the vegetative phase would be between BBCH 01 and BBCH 31, the reproductive phase between BBCH 31 and BBCH 65 etc.. So your duration would be the difference in days between those growth stages. It is recommended to use growing-degree-days / thermal time (°Cd) rather than calendar days to measure the duration of phenological stages. These are corrected for temperature effects, which affect phenology depending on your environment. Thus it is easier to compare data from different locations or years.
In few crops the active phenological stage could be identified through frequent visit to the research plot. In cereal crops as per my knowledge we can observe it directly in nked eye itself.
Generally, we know days required arround 60 days from panicle initiation to maturity and 25-30 days from 50% flowering to maturity.
Dear Gitika,
You may find it useful as it has mentioned the development stage of the required crop:
Article Evaluation of Variable-Infiltration Capacity Model and MODIS...
Article Hydrological Response to Agricultural Land Use Heterogeneity...
Cheers
Ankur
Thats a very good question, crop pheno-phases should be identified based on morphological differentiation in different functional tissues of a plant part or physiological differentiation,in either case ,there should be quantifiable cehanges in input demand, unless those are discernible , crop phenophases have no meaning. they must lead to better input-use-efficiency , let the plant physiology speak differently....
There are several references, but I will suggest for continuous evaluation
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