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Canola generally needs nitrogen, phosphorus and sulphur fertilizer each year. A small percentage of fields will also benefit from a potassium application. The following article suggests what canola needs and what soil and crop residue could provide. The rest will come from fertilizer…
Phosphorus
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A quick test for the safety of seed-placed fertilizer is to turn off the fertilizer feed for about 100 feet, mark the spot, and go back and compare stand establishment in treated and untreated areas…
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Fall fertilizer is best applied as close to freeze up as possible to balance two objectives: (1) allow soil to seal over the band and (2) reduce losses due to high microbial activity in warm soils…
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Canola removes more phosphate than other crops, and studies show that phosphate fertilizer rates have lagged crop removal for years. The result, says soil fertility expert Ross McKenzie, is that about 80% of Prairie fields are deficient in phosphorus… -
1. With phosphorus, ultimately the form you apply is less important than the amount you apply. Crop nutrition specialist Rigas Karamanos used the graph below to show the chronic under-application of P year after year… -
This diagram from IPNI shows where deficiency symptoms are likely to show up on a plant. Nitrogen is mobile, so with an N shortage, plants will move N to new parts of the plant. Therefore deficiency will show up first in older leaves… -
The key with fertility decisions is to apply all of the 4 Rs — right fertilizer source at the right rate, at the right time and in the right place.……
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Phosphorus fertilizer rates have, pretty generally, lagged crop removal for some time. As crops remove the soluble phosphorus in the soil, the soil’s large reserve of less soluble forms will transfer some more phosphorus into the available “labile” pool. However, this labile pool may be losing its ability to keep up, resulting in a “hidden hunger” for phosphate in many… -
The 4 Rs, as described by the Canadian Fertilizer Institute and other crop nutrition organizations, are the right fertilizer source at the right rate, at the right time and in the right place. The 4 Rs will help you make the most of your fertilizer investment. Here are the three basics of canola crop nutrition…
