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Top leaf death in irrigated corn at the Dean Leaf Research and Extension Center, Alexandria, Louisiana, three quarter milk stage. July 17, 2018. Primarily due to high temperatures.

Top Leaf Death or Dieback in Corn

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Please see this post on top death in field corn by Dr. Dan Fromme: LSU AgCenter Corn, Cotton and Grain Sorghum Specialist.

We all know that as a corn crop progresses toward physiological maturity, the leaves naturally begin to senesce (die).  The timing and pattern of leaf senescence are genetically regulated but are also influenced by environmental triggers, including sever photosynthetic stress.  This year, where much of the grain fill period has experienced severe drought and/or heat stress, the onset of leaf senescence can occur earlier than expected prior to kernel black layer.  This means leaves begin to die sooner than expected, and the leaf pattern of leaf senescence sometimes changes.

Top leaf death in irrigated corn at the Dean Leaf Research and Extension Center, Alexandria, Louisiana, three quarter milk stage. July 17, 2018.  Primarily due to high temperatures.
Top leaf death in irrigated corn at the Dean Leaf Research and Extension Center, Alexandria, Louisiana, three quarter milk stage. July 17, 2018. Primarily due to high temperatures.

Most often the leaf pattern of senescence that we see in most years is one where leaf death begins at the bottom of the plant and slowly moves up toward the upper leaves.  However this year, due the late season stress, leaf senescence is progressing from both the bottom and the top of the plant with green leaves remaining in the middle of the plant for some time until complete leaf senescence occurs.  Also, these fields appear to cause an unusual golden glow in the upper canopy against the morning or evening sun.  The impact or effect on grain yield will depend on how early in the grain filling period the death of the upper leaves occurs.  This year, we might see some test weights on the low side.

Citations:  Nielson, R.L., Top leaf death or dieback in corn .2011.  Purdue University Department of Agronomy.

Soybean Nutrient Profile: Calcium

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Click on the link below to see this week’s featured nutrient, calcium.  This nutrient profile is a part of a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a thirteen part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions. 

Soybean Nutrient Profile: Calcium

Check back weekly to find the newest soybean nutrient profile.  Contact your local extension agent with any questions you may have.

Soybean Nutrient Profile: Sulfur

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Click on the link below to see this week’s featured nutrient, sulfur.  This nutrient profile is a part of a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a thirteen part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions.  

Soybean Nutrient Profile: Sulfur

Check back weekly to find the newest soybean nutrient profile.  Contact your local extension agent with any questions you may have. 

Soybean Nutrient Profile: Nitrogen

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Click on the link below to see this week’s featured nutrient, nitrogen.  This nutrient profile is a part of a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a thirteen part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions.  

Soybean Nutrient Profile: Nitrogen

Check back weekly to find the newest soybean nutrient profile.  Contact your local extension agent with any questions you may have. 

Soybean Nutrient Profile: Phosphorus

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We are already on our third installation of the soybean nutrient profile series.  Click on the link below to see this week’s featured nutrient, phosphorus.  This nutrient profile is a part of a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a thirteen part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions.   

Soybean Nutrient Profile: Phosphorus

Check back weekly to find the newest soybean nutrient profile.  You can also find the links to the two previous nutrient profiles below.  Contact your local extension agent with any questions you may have. 

Soybean Nutrient Profile: Potassium Soybean Nutrient Profile: Manganese

Soybean Nutrient Profile: Potassium

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Click the link below to find the second installation of the soybean nutrient profile series featuring potassium.  This nutrient profile is a part of a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a thirteen part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions.   

Soybean Nutrient Profile: Potassium

Check back weekly to find the newest soybean nutrient profile.  Contact your local extension agent with any questions you may have.

Soybean Nutrient Profile: Manganese

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Click the link below to find the first soybean nutrient profile on manganese.  This nutrient profile is the first in what will be a weekly series dedicated to the function of the 16 essential nutrients in soybean.  After excluding carbon, hydrogen, and oxygen, we are left with a 13 part series in which we will explore how nutrients are used throughout the plant as well as how to identify deficiency symptoms and develop nutrient management decisions.   

Soybean Nutrient Profile: Manganese

Check back weekly to find the newest soybean nutrient profile.  Contact your local extension agent with any questions you may have.

Louisiana Rice Notes #4

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This edition covers upcoming field days, crop update, disease management, rice drying and rice irrigation survey results, a new channeled apple snail survey, and how to join the text message group. This edition and older editions can be found on the LSU AgCenter’s Rice website here: http://www.lsuagcenter.com/topics/crops/rice/field_notes

Louisiana Rice Notes #3

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The third edition of  Louisiana Rice Field Notes for 2018 is now available. This edition covers planting progress, DD50 heat units, stunted rice, rice seed and seedling diseases, channeled apple snail damage, Loyant herbicide use, and a consultant quiz. Older editions can be found on the LSU AgCenter’s Rice website here: http://www.lsuagcenter.com/topics/crops/rice/field_notes

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