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Nitrate levels in Silage

aidanki · 2018-05-21 23:05:24

tested last week and still high in nitrates field 1had a reading of 2000 and field 2 had a reading of 7000 Need to be under 1000 I think before cutting is recommended I did some research and came up with the following, do we have any scientists who can confirm my calculations. After some research it appears that the 2000…

21-05-2018 11:05pm

#1

aidanki

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tested last week and still high in nitrates

field 1had a reading of 2000 and field 2 had a reading of 7000

Need to be under 1000 I think before cutting is recommended

I did some research and came up with the following, do we have any scientists who can confirm my calculations.

After some research it appears that the 2000 and 7000 are PPM and levels should be under 1000ppm or 0.1%DM before cutting. http://www.yara.ie/news/94536/nitrates-and-silage-fermentation/

One hectare of grass has 5000kg DM, from 25000kg fresh weight. https://www.agriland.ie/farming-news/fertilising-rules-for-this-years-grass-silage/ the article mentions 10tonne per acre or 25000kg per hectare.

Thus 0.1% is 5kg of Nitrogen, thus we conclude I have 10kg of N in Field 1 and 35kg of N in Field 2.

Therefore Field 1 has to dissipate via growth 5kg of Nitrogen and field 2 has to dissipate 30kg of Nitrogen.

https://www.agriland.ie/farming-news/fertilising-rules-for-this-years-grass-silage/ This article says growing grass consumes 2.5kg/Ha per day, thus we conclude the Nitrates in Field 1 should be at the 0.1% threshold in 2 days (5/2.5) and in Field 2 in 12days (30/2.5).

Anyone able to confirm my understanding ?

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