Home Crop Monitoring Corn School: Nitrogen loss and late-season impacts

Corn School: Nitrogen loss and late-season impacts


An absence of late-season nitrogen and denitrification has been a priority this 12 months, which is inflicting lower than optimum development in corn crops in elements of Ontario.

Matt Chapple, market agronomist at Satisfaction Seeds, has been getting loads of calls this rising season in regards to the problem, and on this Corn Faculty episode, Bernard Tobin joins Chapple within the subject, at Satisfaction Seeds’ Training Centre to speak about it.

“This particular plant, we’re seeing that firing up from the bottom, we’re at the ear leaf, we’re very pale, this if not what we would like to see, and in fact now that we’ve had pollination, we’re seeing tip-back in the plant,” says Chapple.

Earlier climate occasions within the rising season are taking part in a giant half in what’s happening, says Chapple.

Facet-dress nitrogen was utilized early, at time, and the crop was rising very well, however extra moisture within the month of July brought about leaching losses and denitrification, so plant-available nitrate decreased. The stress on the crop could be seen first in compacted areas, resembling headlands.

Chapple says that he’d somewhat see denitrification and leaching loss of nitrogen early within the season as a result of he believes soil mineralization can greater than make up for these losses, which permits extra time for administration alternatives.

“We know that as we get farther into the growth stages, that those yield losses are irreversible,” says Chapple.

From the V6 to V10 development phases, the corn plant could be taking over as a lot as one pound of nitrogen per inch of development, and by the point the plant reaches the R phases, 80 per cent of the plant’s nitrogen has been taken up, says Chapple.

Nothing a lot could be completed at this level of the rising season, however planning for harvest, and for subsequent 12 months, may help to mitigate these nitrogen losses from taking place once more. Chapple says to evaluate low-nitrogen crops earlier than harvest — push checks because the crop progresses, or prematurely senesces, for one; acknowledging illness stress sooner or later; a pinch take a look at because the plant turns brown to find out stalk integrity; and assessing ears to calculate losses on the header.

“There’s so many great corn farmers in Ontario, and they know their soils, and they know their nitrogen strategies,” says Chapple. He suggests to get nitrogen down in starter type with the seed, to separate purposes, or get nitrogen down with herbicide — however to concentrate on the climate and environmental situations as a way to maximize nitrogen by to grain-fill.


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