Root vegetables and tubers
PDFCurrent knowledge to the nutrient care in carrots
The carrot cultivation has concentrated more and more during the last years. The rising demands for yields with appropriate high quality standards led to a specialization. The high expectations can be reached only with an optimized and conformist fertilization.
Near the essential soil examinations the aid of the complex plants analysis has established itself to the supplement of these results during the last years in the vegetable gardening. With the help of these examinations the "performance" of the soil state is established. So an aimed nutrient supplement can be planned to the increase of quality and yield.
Phosphorus and magnesium lack
The result of the complex plants analysis during the last years have proved that with the macronutrients particularly the phosphorus and magnesium care lay with more than half of the examined tests in the undersupplied area.
With a magnesium lack (pic 01)first yellow, afterwards brown leaf tops on older leaves will appear.
A phosphorus lack (pic 02) is indicated by reddish leaves, particularly at the midrip. The growth is stunted, the plants remain small.
magnesium-deficiency (pic 01)
lack of phosphurus (pic 02)
Micronutrient supply with boron, zinc, manganese and molybdenum
Boron lack inhibits the formation of blade masses, together with a reduced assimilation surface, with a serious lack cracks and hollows with appear in and on the carrots.
Zinc lack causes a disturbed auxine metabolism, the consequences are small leaves and dwarfism.
A lack of manganese appears by a yellow coloring between the nerves. With a manganese lack the first symptoms will appear on the just entirely developed leaves and later also on the younger leaves. In contrast to the magnesium lack where these first symptoms appear on the oldest leaves.
Molybdenum lack leads to a burst of carrots.
By a multiplicity of foliar fertilization attempts in carrot cultivation during the recent years the effectiveness of this measure can be covered.
Building on the achievements of the complex plants analysis the following attempts were executed.
The results show that this strategy contribute to increase the yields and protect the high quality standards.
Lebosol®-Magphos improves initial development of carrots
Agravis Raiffeisen AG, Abbenhausen, Niedersachsen, 2009-2013
Fertilization after results of a complex plant analysis increases the yield of carrots
Agravis Raiffeisen AG, Abbenhausen, Niedersachsen, 2011-2014
Main recommendations
| Aim/Problem | Recommendation | Time |
|---|---|---|
| Improvement in effectiveness and tolerability of soil-applied herbicides | 0,2 - 0,6 l/ha Herbosol® (Increase to 0.6 l/ha on light soils with a low humus content; reduce to 0.2 l/ha for heavy soils with a high humus content.) | With soil-applied herbicides |
| Promotion of root formation, growth | 5 - 10 l/ha Aminosol® | 7 - 10 days after planting |
| Improvement in effectiveness and tolerability of plant protection products | 150 - 300 ml Aminosol® (per 100 l spray water) | With plant protection products |
| Improvement in effectiveness and tolerability of plant protection products | 1 - 2 l/ha Aminosol® | With post-emergence herbicides, in extreme weather conditions |
| To cover periods with poor growth conditions | 4 - 6 l/ha Lebosol®-Total Care | In the event of stress at the site |
| Calciumtransport, Ertrag, Knöllchenbildung, Qualität (Risse bzw. hohle Knollen, innere Verbräunung) |
1 - 2 times 0,25 l/ha Lebosol®-Molybdän + 1 - 4 times 2 - 3 l/ha Lebosol®-AqueBor SCor1 - 4 times 2 - 3 l/ha Lebosol®-AqueBor SC (Mo) |
Once sufficient leaf mass has developed |
| Improvement in leaf quality, photosynthesis rate, N efficiency | 2 - 3 times 1 l/ha Lebosol®-Mangan GOLD SC | Once sufficient leaf mass has developed |
| Calcium transport, internal quality, vitamin synthesis | 1 - 3 times 0,5 l/ha Lebosol®-Zink 700 SC | Once sufficient leaf mass has developed |
| Improvement in quality and shelf life | 2 - 4 times 5 l/ha Lebosol®-Kalium 450 | Once sufficient leaf mass has developed |
| Improvement in leaf quality, chlorophyll, vitality, photosynthesis rate | 2 - 3 times 3 - 5 l/ha Lebosol®-MagSOFT SC | Once sufficient leaf mass has developed |
| Storage stability, increase in resilience | 3 - 4 times 4 - 6 l/ha Lebosol®-Calcium-Forte SC | Once sufficient leaf mass has developed |
| Vitalisation, improvement in the photosynthesis rate, resilience, internal quality | 2 - 4 times 4 - 6 l/ha VITALoSol® GOLD SC | Once sufficient leaf mass has developed |
| Initial development, vitality, energy and water balance, N efficiency | 1 - 2 times 5 l/ha Lebosol®-Magphosor1 - 2 times 6 - 8 l/ha Lebosol®-PK-Max | Once sufficient leaf mass has developed |
| Treated crops are avoided by mice | 3 - 5 times 5 l/ha Lebosol®-Schwefel 800 OD | When required |
| Treated crops are avoided by furred game | 2 l Aminosol® (With 2 l water 2 - 3 days beforehand (quantity for 1 ha)) | When required |