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This cultivator easily adjusts to various row widths. Some narrow- row farmers use herbicides and get by with a single cultivation or none at all. tmiGnrar* WHAT ABOUT NARROW ROWS? One night at an association meeting somebody says there's a leptospirosis epidemic in the next county* What do you do? You offer to do what you can to help. Then you continue with the meeting. Because you did what needed to be done long ago. You vaccinated with Pfizer Leptospira Pomona Bacterin, a chemically-killed whole broth culture of Leptospira pomona, which assures high potency in every dose. In most cases, a single injection annually protects your animals against "Lepto" throughout the entire year. What's more, Pfizer Leptospira Pomona Bacterin is aluminum hydroxide adsorbed. This means you get slower absorption and better immune response. So, inoculating your cattle, swine, sheep and horses widi Pfizer Leptospira Pomona Bacterin is doing a favor for both your ?nirn?ils and your neighbors. You'll sleep better, too. Next time ask for Pfizer. Agricultural Diviiioo, Chu. Pfbet &• Co.. Inc.. New York. N-Y. 10017 Leptospira Pomona Bacterin ' arrow rows are catching on faster than pop-open beer cans. No doubt about it, narrow rows can widen profits ... on your farm as well as your neighbors'. "Okay, I'll agree to that," reply a lot of farmers with whom we've discussed the narrow-row subject "But can I afford to make the changeover now? I'm geared to 38" rows with my planting, cultivating and harvesting equipment... some of my equipment's half-new." Then they play their aces: "What does changing over to narrow rows cost? And how many extra bushels will I have to raise on each acre before such a changeover pays off?" Such questions aren't easily answered. Briefly, here are some of the things to consider, basing the figures on the Doane Agricultural Service chart below: 1 — Herbicide costs will be higher. Figure $1.45 an acre more. Going from 40-inch to 30-inch rows means 25% more herbicide. 2 — Seed cost will be higher for soybeans, but not for corn, unless you increase plant population. Soybeans for seed cost about 600 more per acre. Every 2,000 plant-per-acre increase in seed corn will add about 35<: per acre. 3 — Labor, tractor and combine costs for soybeans total 210 less per acre for 6-row narrow equipment over the 4-row equipment, and 41<: less for com. One trip with 6 rows at 30 inches covers 180 inches, while 4 rows at 40 inches covers only 160 inches of machine width. If your combine can be switched to narrow-row harvesting by simply changing cornheads like this one, a major portion of narrow-row changeover costs arc eliminated.