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The best way to know the fertilizers to use in onion farming is through soil testing. Soil testing enables a farmer to know the soil composition and the required corrections for effective onion production. However there is a basic guide on fertilizer application that we will dive into in this article. Onion Doctor provides Soil testing services at competitive prices. Be sure to contact us for a quote.
Onions require a high source of nitrogen. A nitrogen-based fertilizer (ammonium sulfate or ammonium nitrate) should be applied at the rate of one cup per twenty feet of row. The first application should be about three weeks after planting and then continue with applications every 2 to 3 weeks.
Potassium is necessary for good photosynthetic activity, migration, and utilization of synthetic carbohydrates. Its deficiency causes the yellow-green leaves, tops, and small bulbs to dry out. Onion cultivation requires 100 kg nitrogen, 50 kg phosphorus, and 50 kg potash
Fertilization regime
Fertilizer application for Onion should therefore start by first week after transplanting, with an NPK regime for establishment of the crop. 40% of the N, and K as well as Calcium requirements should then be applied by the 3rd-4th week during the first Top- dress. The second Top-dressing should then be done at the Bulbing stage.
Onion Nutrition
All basal fertilizers (e.g. DAP, CAN, etc.) and manure should be mixed with HUMIPOWER at the rate of 1kg Humipower into 50kg fertilizer or 1 ton of manure. Humipower helps to improve on the nutrient uptake by the crop, stimulates growth, improves soil structure, and adds organic matter to the soil among other benefits.
OPTIMIZER 10ml/20l should be sprayed at all stages in order to boost crop’s immunity, manage stress, and improve the general performance of the crop. It supplies both macro and micro nutrient elements and growth hormones.
Fertilizer application timing has a significant effect on crop yields. Proper timing of the fertilizer application increases yields, reduces nutrient losses, increases nutrient use efficiency and prevents damage to the environment.
Once the neck starts feeling soft do not apply any more fertilizer. This should occur approximately 4 weeks prior to harvest.
Onion Doctor supports small holder farmers across Africa with quality and affordable Onion and Garlic seedlings, Onion seedlings, Farm planning services, Soil testing, Drip irrigation installation and maintenance, Agronomic support, Onion and Garlic value pack, Farm management, E-extension and on-farm training for farmers to optimize on yields and get maximum profits.