Why Corn Leaves Turn Yellow

Tips, Tricks

1. Thank you Thomas Smith great video direct and very clear.
2. Would blood meal work? My corn is only a foot and its already going yellow on the bottom leaf. The rest of the plant looks good. 
3. I'm glad to hear of your success. Like any grass, corn is a heavy user of nitrogen.
4. Yes, it's likely that nitrogen would be the culprit here as well. Nitrogen is not only mobile in the plant but it is also mobile in the soil. You may be experiencing too much loss from your soil mix due to watering. This is a natural occurence that can be remedied with multiple small applications of a nitrogen based fertilizer during your growing season.
5. The most likely cause is a lack of nitrogen. This nutrient is "mobile" in the plant and will be moved from the lower leaves first in times of need. I would be interested to know if your entire plants are looking a little pale as well. This would also point to nitrogen. One option would be to add a nitrogen only fertilizer such as 21-0-0 (ammonium sulfate) at the rate of 1 pound for each 100ft of row. Apply the fertilizer in a narrow band 6 inches from the plants and water in thoroughly.
6. Is this true also for young pumpkin plants? Every year I grow pumpkins, they start out great, but within a month, the bottom leaves start to turn yellow, and sometimes they just spread to more and more of the leaves on the plants. Now these are young plants, a month old since germination. I use miracle grow garden soil so I know they have plenty of nitrogen. Any help would be appreciated.
7. I used 46-0-0 lawn fertilizer works great on my corn.