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bean leaves turning yellow

i'm growing contender and kentucky wonder bush beans. they're about eight inches tall and the leaves have started turning yellow. i'm using composted cow manure and have been sprinkle watering about twice a week. what am i doing wrong? thank you.
billy
 
Texas gulf coast. zone 9
i'll bet it's some sort of soil deficiency. we have a problem with magnesium deficiency around here, which really affects tomatoes.

you could get a soil test done (ask your ag extension agent) or find an old farmer nearby and ask them. it's amazing how much old farmers know. (unless their only anwer is chemicals!)

also, I would try to only water them about once a week--it makes their root systems go deeper and they do better in hot weather. water them deeply tho, when you do. too much water can make leaves turn yellow.

good luck! fresh green beans are worth it!
 
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How are they turning yellow? There are several things that can cause chlorosis (yellowing) but each has slightly different signs.
Nitrogen deficiency is one.
Magnesium deficiency is one.
Zinc deficiency is one.
Iron deficiency is one.
Manganese deficiency is one.
Molybdenum dificiency is one.
There may be another one or two that I've forgotten.
 
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