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Avoid Oilseed Seedling Damage From Fertilizer
Small amounts of fertilizer are most available to crops, including oilseeds, if placed with the seed. But, seedling damage can also occur with this type of fertilizer placement depending on the crop, type and rate of fertilizer, soil texture, and soil moisture.
Oilseed crops are more sensitive to fertilizer placed with the seed than cereal crops like wheat and barley. Maximum rates of actual plant food placed with canola, crambe, flax, mustard, and sunflower seed is 5 to 10 pounds per acre of nitrogen (urea not recommended) and 20 pounds per acre of phosphorus. Fertilizer placement with soybean seed is not recommended.
Fertilizers can cause damage by drawing moisture away from the seedling (may kill by dehydration) and by actual toxicity to the seedling.
Nitrogen fertilizers are more harmful to the crop seedling than phosphate fertilizers. Fertilizers containing urea are more harmful than ammonium nitrate. Also, fertilizer damage tends to be greater on sandy soils and under dry conditions.
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