Correcting nitrogen deficiency in beans
Recently we found ourselves correcting a nitrogen deficiency in our green beans. They were beginning to turn yellow throughout the entire plant, meaning we have a nutritional deficiency.
To ensure we correctly identified the deficiency and made the right correction, we went to the MGC book. On page 147 of the Mittleider Gardening Course shows us a general yellowing of the entire plant is a nitrogen deficiency. It calls for a correction of 1/4 ounce per linear foot of nitrogen to be added. The nitrogen should be worked into the soil and watered into the soil.
Urea is available locally, 46-0-0, so we will use it as our form of nitrogen.
What caused the deficiency?
It is normal to see deficiencies in your garden. Some plants use more nitrogen than others, making them more susceptible to some form of nutrient deficiency .
In our case these beans were started in some recently mixed sand and sawdust in a grow box. The natural decomposition of that sawdust used up the available nitrogen. One application of the urea 46-0-0 was enough to bring the beans green color back.
It may take a week or two for plants to recover if you have correctly identified the problem. If after one week no improvement is seen then look for other possible causes. As always, it would behoove the gardener to refer to the Mittleider Gardening Course book.