TY - JOUR
T1 - Lesquerella seed and oil yield response to split-applied N fertilizer
AU - Liu, Jiangang
AU - Bronson, Kevin F.
AU - Thorp, Kelly R.
AU - Mon, Jarai
AU - Badaruddin, Mohammad
AU - McCloskey, William B.
AU - Ray, Dennis T.
AU - Chu, Qingquan
AU - Wang, Guangyao
PY - 2014/9
Y1 - 2014/9
N2 - Agronomic management information is critical for successful commercial production of new crops such as lesquerella [Physaria fendleri (A. Gray) O'Kane & Al-Shehbaz]. Response of lesquerella to six nitrogen (N) fertilizer rates under well-watered and water-stressed treatments were studied in irrigated desert conditions in the southwestern United States to establish guidelines for lesquerella N management. Seed and oil yield, seed and straw N concentrations, N harvest index, and total N uptake were recorded at harvest and destructive biomass samples were also collected during growing season for plant N status. Although soil NO3-N was low due to a cover crop to remove excessive N in the soil, pre-plant N fertilizer did not affect lesquerella growth at the early growth stage. For the treatments with high N fertilizer rates (224 and 336kgha-1), lesquerella plant N concentrations were relatively stable before the first bloom, decreased drastically until mid-bloom (one month after the first bloom), and then continued to decrease at a lower rate until harvest. As N fertilizer rates increased, seed and straw N concentration increased linearly under both well-watered and water-stressed conditions. Lesquerella seed and oil yield had a quadratic relationship with N fertilizer rate. Because seed oil concentration decreased as N fertilizer increased, N fertilizer rate for the optimum oil yield was lower than the N fertilizer rate for the optimum seed yield. According to seed and oil yield as well as plant N status under different N fertilizer rates, we provided a guideline for N fertilizer management for lesquerella.
AB - Agronomic management information is critical for successful commercial production of new crops such as lesquerella [Physaria fendleri (A. Gray) O'Kane & Al-Shehbaz]. Response of lesquerella to six nitrogen (N) fertilizer rates under well-watered and water-stressed treatments were studied in irrigated desert conditions in the southwestern United States to establish guidelines for lesquerella N management. Seed and oil yield, seed and straw N concentrations, N harvest index, and total N uptake were recorded at harvest and destructive biomass samples were also collected during growing season for plant N status. Although soil NO3-N was low due to a cover crop to remove excessive N in the soil, pre-plant N fertilizer did not affect lesquerella growth at the early growth stage. For the treatments with high N fertilizer rates (224 and 336kgha-1), lesquerella plant N concentrations were relatively stable before the first bloom, decreased drastically until mid-bloom (one month after the first bloom), and then continued to decrease at a lower rate until harvest. As N fertilizer rates increased, seed and straw N concentration increased linearly under both well-watered and water-stressed conditions. Lesquerella seed and oil yield had a quadratic relationship with N fertilizer rate. Because seed oil concentration decreased as N fertilizer increased, N fertilizer rate for the optimum oil yield was lower than the N fertilizer rate for the optimum seed yield. According to seed and oil yield as well as plant N status under different N fertilizer rates, we provided a guideline for N fertilizer management for lesquerella.
KW - Lesquerella
KW - Nitrogen
KW - Oil yield
KW - Seed yield
UR - http://www.scopus.com/inward/record.url?scp=84903832776&partnerID=8YFLogxK
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U2 - 10.1016/j.indcrop.2014.06.024
DO - 10.1016/j.indcrop.2014.06.024
M3 - Article
AN - SCOPUS:84903832776
VL - 60
SP - 273
EP - 279
JO - Industrial Crops and Products
JF - Industrial Crops and Products
SN - 0926-6690
ER -