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■ Unit conversion

□ Area

	Acre	ha	m2	ft2
Acre	1	0.404686	4,046.86	43,560
ha	2.47105	1	10,000	107,639
m2	0.000247105	0.0001	1	10.7639
ft2	0.000022956	0.00000929	0.092903	1

□ Weight

	lbs	kg
lbs	1	0.453592
kg	2.20462	1
bushel [corn]	56	56 * 0.453592 = 25.4
bushel [wheat]	60	60 * 0.453592 = 27.2
bushel [soybean]	60	60 * 0.453592 = 27.2

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My target nitrogen application rate is 100 N lbs / acre in sorghum, and my plot size is 250 ft²

1 acre = 43,560 ft2
→ 100 lbs / 43,560 ft2

100 lbs : 43,560 ft2 = x lbs : 250 ft2
∴ x = (250 * 100) / 43560 
     → 0.574 lbs

1 lbs : 0.453592 kg = 0.574 lbs : x kg
∴ x = 0.260 kg

Based on the target rate of 100 N lbs/acre, the amount of nitrogen for my plot size is 0.260 g. I’ll apply nitrogen as urea, which contains 46% nitrogen. Here is the equation to calculate the amount of urea.

Therefore, I need to apply ca. 565 g of urea to meet my nitrogen requirement of 260 g for your plot size.

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