#42, #43 - clean, crisp, simple and suggestive...fresh green for agro, blue for business, no negative emotional valence and goes well with this positive green. The upside-down dot from the letter 'i' stands in for the injection jet/nozzle/head in the manifold/pipe/line. #43 overtly shows a pipe drawing end while #42 leaves that bit aside. Let me know your thoughts, Erik...
like this one better, not sure about the leaf.... can you try different elements. i agree with you that we had too many dots (ie. on the letters... i like your reduction to one to indicate the injection point.) but i need a logo that works in the ag/green industry and other industries as well.
#153 - Since the company is dealing with fluid technology, a droplet seem appropriate. I also changed to upper case and switched out the green for gey on the injection point. Let me know if I can show you anything else...