For optimal onion production, it is crucial to apply fertilizer regularly, ensuring the highest yields and the best quality onions. The application of fertilizers should align with the plant’s growth stages, providing appropriate nutrient rates and ratios. Timely fertilization plays a vital role in the successful production of onion plants.
Early growth stage
This refers to the timeframe that encompasses seed sowing, germination, transplanting, and approximately 2-3 weeks following the transplantation of seedlings.
For the nursery, it is recommended to administer a drench of OPTIMIZER at a rate of 20ml per 20 liters of water. This aids in breaking seed dormancy, promoting even germination, and supplying nutrients to the emerging seedlings.
To encourage robust early growth, enhance root development, facilitate healthy shoot growth, and provide nourishment to the transplanted seedlings, it is advisable to spray the crop with one of the following options: GOLDCHANCE SUPER START at a rate of 50g per 20 liters, or LAVENDER at a rate of 20ml per 20 liters, or VITABOR GOLD at a rate of 30ml per 20 liters, or PLANT SOUL at a rate of 20ml per 20 liters.
To mitigate the risk of transpiration shock, seedlings should be sprayed with OPTIMIZER at a rate of 10ml per 20 liters.
During the transplantation process, the main field should be treated with either DAP or manure, depending on the soil’s fertility level, in order to provide necessary nutrients.
During this particular stage, the crop exhibits active growth and engages in photosynthesis to accumulate sufficient resources for later utilization during bulbing.
To ensure continuous growth and development, foster robust and healthy leaf growth, and prevent any limitations in photosynthetic growth, it is recommended to apply one of the following options to the crop: GOLDCHANCE SUPER GROWTH at a rate of 50g per 20 liters, or LEGENDARY at a rate of 40ml per 20 liters, or LAVENDER at a rate of 20ml per 20 liters.
The ultimate size of the onion bulb depends on the quantity and size of the green leaves or tops at the time of bulb maturity. Each leaf corresponds to a ring of onion, and the larger the leaf, the larger the resulting ring.
To provide additional nutrients during this stage, top dressing can be carried out using CAN. Other basal fertilizers like NPK 23:23:0 can also be applied.
Bulb formation & development
To achieve optimal results, it is crucial to provide the crop with sufficient nutrients during this stage.
By utilizing sprays such as GOLDCHANCE SUPER FLOWERS & FRUITS at a rate of 50g per 20 liters, LEGENDARY at a rate of 40ml per 20 liters, DIMIPHITE at a rate of 20ml per 20 liters, GREENPHITE at a rate of 50ml per 20 liters, or VITABOR GOLD, the following benefits can be obtained:
- Sustaining early growth and promoting bulb development
- Supporting leaf growth
- Maximizing the dry matter content and overall quality of the bulbs
- Improving the storage quality of the bulbs
- Maintaining bulb firmness and size
- Enhancing the color of the bulbs
- Ensuring ripening and early maturity
Important notes to consider:
- At all stages, it is recommended to spray OPTIMIZER at a rate of 10ml per 20 liters. This boosts the crop’s immunity, manages stress, and enhances overall performance by providing essential macro and micronutrients as well as growth hormones.
- Basal fertilizers (e.g., DAP, CAN) and manure should be mixed with HUMIPOWER at a rate of 1kg of Humipower into 50kg of fertilizer or 1 ton of manure. Humipower improves nutrient uptake, stimulates growth, enhances soil structure, and adds organic matter to the soil, among other benefits.
- When conducting foliar sprays, it is advisable to mix the foliar feed with INTEGRA at a rate of 3ml per 20 liters. INTEGRA acts as a sticker, spreader, and penetrant, enhancing the absorption of the fertilizer by the crop’s foliage.
- Proper timing of fertilizer application has a significant impact on crop yields. It increases yields, reduces nutrient losses, improves nutrient utilization efficiency, and prevents environmental damage.
- Foliar sprays should be repeated on a weekly basis while monitoring the overall performance of the crop.
- Once the neck of the onion starts feeling soft, no further fertilizer should be applied. This typically occurs approximately 4 weeks prior to harvest.