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By-Plant N Management

By-Plant N Management. Oklahoma State University. Scale. Ames, IA. Ames, IA. Stillwater, OK. By-Plant N Management. Paul Hodgen, Jim Schepers, 15N. 60% of by-plant N accounted for in individual plants. Ames, Iowa. Shelton, NE. Ames, IA.

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By-Plant N Management

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  1. By-Plant N Management Oklahoma State University

  2. Scale

  3. Ames, IA

  4. Ames, IA

  5. Stillwater, OK

  6. By-Plant N Management

  7. Paul Hodgen, Jim Schepers, 15N 60% of by-plant N accounted for in individual plants

  8. Ames, Iowa

  9. Shelton, NE

  10. Ames, IA

  11. At the sites with the highest average corn grain yield (11478 and 14383 kg ha-1, Parana Argentina, and Phillips, NE), average plant-to-plant variation in yield was 4211 kg ha-1 (67 bu ac-1) and 2926 kg/ha (47 bu ac-1), respectively.  As average grain yields increased, so too did the standard deviation of the yields obtained within each row.  This clearly indicates that by-plant variability can be expected in high and low yielding environments.  Furthermore, the yield range (maximum corn grain yield minus the minimum corn grain yield per row) was found to increase with increasing yield level.  This work shows that regardless of yield level, plant-to-plant variability in corn grain yield can be expected and averaged more than 2765 kg ha-1 over sites and years. Agron. J. 97:1603-1611

  12. Causes for Delayed and uneven emergence • •variable depth of planting • •double seed drops • •wheel compaction • •seed geometry within the furrow • •surface crusting • •random soil clods • •soil texture differences • •variable distance between seeds • •variable soil compaction around the seed • •insect damage • •moisture availability • •variable surface residue • •variable seed furrow closure • •volunteer • early season root pruning (disease, insect)

  13. 5-Plant Sequence

  14. Formula

  15. Treatment Structure

  16. By-plant By-row Methods of placement Betweenrows

  17. SED = 1.15

  18. SED = 0.55

  19. By-plant fertilization method had slightly higher yields in five out of six site-years, especially at the low N rate. • In five of six site years the middle N rates of 67 and 90 kg N ha-1 showed grain yields as high as or higher than the 135 and 225 kg N ha-1 N rates. Results

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