I would like to know what are the visual indicators that can be used to determining the quality of the soil and plants by looking at the in-situ photos?
Can the following quality indicators be determined by visual check such that a decision making can be done?
- Approximate Soil Salinity
- Soil pH
- Soil Moisture
- Soil Content (red indicates presence of iron etc)
- Presence of weeds
- Presence of bug infestation (perhaps different visual patterns to identify kind of infestation)
- Plant Health (rigid looking vs hanging etc)
The above is whats there in the top of my head, can this list be expanded and upto what degree the quality indicators can be relied upon?
Note: Soil salinity might not be easily determined if the excess salt doesn't precipitate (visible white layer on the soil can help determine the excess of salt hence its not a good visual quality indicator for most of the time.