DIY Homemade Liquid Fertilizer Monitor
After seeing a in-furrow and 2X2 fertilizer monitor system at the Farm Progress Show ($10,000+), I built this DIY system with an Android tablet, an Arduino based control box, and Amazon $10 flowmeters for around $800 (in 2019).

GPA Graph on Tablet
I've simplified the fertilizer monitor app to just a graph of gallons per acre by row.
I run electric pumps for my infurrow and 2X2 systems.
I don't look at pressure. I adjust the gallons per acre by watching the monitor and adjusting the flow.

The fertilizer app running on Android

control box options

12 row circuit (now 16 rows)

Meter support

Stacked blocks

Meter blocks bolted on frame behind sight tubes.

Custom harness at $40/row

Tablet holder

Tablet holder bracket

DIY Manifold
