Lettuce Nitrogen Uptake and Partitioning
Crops:
Almonds
Barley
Broccoli
Cauliflower
Citrus
Corn for Grain
Corn for Silage
Cotton
Grapevines
Lettuce
Pistachio
Rice
Strawberries
Tomatoes
Walnut
Wheat
Seasonal N Uptake
Nitrogen uptake was determined by harvesting the aboveground
biomass at different times during lettuce development.
Early in the season, lettuce N uptake was low. Between heading
and harvest, however, N demand of lettuce was high. During
this period, which is generally the last month before harvest,
70-80% of total N was taken up (Bottoms et al., 2012).
Nitrogen Partitioning
Wrapper leaves and not marketable heads may contain 10-40% of
the aboveground N (Thompson and Doerge, 1996; Hartz et al.,
2000).
Nitrogen Removed at Harvest
Lettuce yield and N removed at harvest.
Links
References
Bottoms, T.G., Smith, R.F., Cahn, M.D., Hartz, T.K., 2012. Nitrogen requirements and N status determination of lettuce. HortScience 47, 1768-1774.
Hartz, T.K., Bendixen, W.E., Wierdsma, L., 2000. The value of presidedress soil nitrate testing as a nitrogen management tool in irrigated vegetable production. HortScience 35, 651–656.
Thompson, T.L., Doerge, T.A., 1996. Nitrogen and water interactions in subsurface trickle-irrigated leaf lettuce II. Agronomic, economic, and environmental outcomes. Soil Science Society of America Journal 60, 168-173.