Open Access
Table 1.
Graded content of macroelements in potatoes (according to V.V. Tserling, 1990)
| Element | Phase, period | Indication organ | Content grade | |||
|---|---|---|---|---|---|---|
| Very low | Low | Optimal | High | |||
| Total nitrogen | Shoots 6-7th leaf | 2-3rd leaf 4th leaf from top | <4.0 | 4.0-4.2 | 4.5-6.0 | >7.0 |
| Budding | 4-5th leaf from top | <3.0 | 3.5 | 4.5-5.0 | >5.0 | |
| Total phosphorus | Shoots | 2-3th leaf 4th leaf | <0.3 | 3 | 0.4-0.5 | >0.6 |
| 6-7th leaf | from top | <0.25 | 0.3-0.36 | 0.40-0.50 | >0.50 | |
| Budding | 4-5th leaf from top | <0.2 | 0.3-0.38 | 0.40-0.60 | >0.65 | |
| Total potassium | Beginning of flowering | Upper developed leaves | <0.5 | 0.5-0.7 | 0.8-3.0 | >3.0 |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.