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field affected by localized decline

Localized Decline

Localized Decline published on No Comments on Localized Decline

We continue to get a few calls regarding Localized Decline, perhaps more this year than the last couple.  The field shown at right had about 7 to 8 pounds of actual zinc per acre applied to it when the problem showed up.  Apparently, that is not enough in this field.  Dr. Harrell’s studies have shown that about 10 pounds of actual zinc as zinc sulfate or 2 pounds as zinc chelate are necessary to correct the problem.  In severe cases more is needed.

What confused me when I visited the field were the conspicuous green drill rows in contrast to the affected plants.  The farmer told me all of the green rows are where there was an excessive amount of seed as a consequence of a malfunction of the planter not detected until much of the field had been planted.  This could provide another clue.  Plants showing the symptoms almost always have very high levels of iron and aluminum in them.  It could be a dilution effect of the toxic elements because each seedling is getting a lower dose of these elements.

field affected by localized decline
field affected by localized decline

Localized Decline in Rice

Localized Decline in Rice published on No Comments on Localized Decline in Rice

It has been a while since I have used photographs of localized decline in Field Notes.  The affected field is in Evangeline parish.  I do not have any soil test data, but the field representative said he suspected a zinc deficiency in the soil.  Dr. Dustin Harrell’s studies have shown that high levels of zinc can prevent the problem in areas of known problems or correct it in situations like this one.  The field has been fertilized and flooded and draining will compromise fertility and weed control.  Ten pounds of actual zinc as zinc sulfate or two pounds as a foliar chelate were recommended.  The symptoms here are thinning of the stand and bronzing of the lower leaves.  You do not have the advantage of a view of the remainder of the field; however the affected areas were very obvious.

 

area rice field affected by localized decline
area of rice field affected by localized decline
 

symptoms of localized decline on rice plants
symptoms of localized decline on rice plants