Journal of Food, Agriculture and Environment

Response of the growth and N and P nutrition to mitigating and optimization fertilization with plant growth regulators in lettuce

Author(s):

Baozhen Li ^1#, Xia Li ^{1, 2#}, Xiaorong Zeng ^1,2, He-ai Xiao ¹, Yong Li ¹, Caiyan Chen ¹, Wenxue Wei ¹, Jinshui Wu ¹*

Recieved Date: 2012-07-08, Accepted Date: 2012-10-04

Abstract:

To alleviate nitrate contamination of vegetables and reduce fertilizer use without damaging yield, we studied the effects of 15 combinations of plant growth regulators (PGRs) on growth and nutrient uptake of lettuce grown in pots with half rate of N-P-K (hNPK) fertilizer. The biomass of most PGR-treated plants was similar to that of the full rate of NPK (fNPK) treatment. Compared with hNPK, dry weight was significantly increased (14.4-16.2%) when treated with 3 µM indole 3-acetic acid (IAA), 2 µM 6-benzyl aminopurine (BA), and 150 µM vitamin B1 (VB₁); 6 µM IAA, 1 µM BA, 0.5 µM gibberellic acid-3 (GA3), and 150 µM VB₁; and 6 µM IAA, 2 µM BA, 0.25 µM GA3, and 150 µM vitamin C (Vc). N and P contents increased significantly (by 14.0-35.2%, and 17.1-57.9%, respectively) in most PGRs treatments with hNPK. The PGR treatment with 6 µM IAA, 2 µM BA, 0.25 µM GA3, and 150 µM Vc significantly increased P by 13.0% compared with fNPK. The nitrate content of the PGR- treated lettuce was significantly reduced by 11.1-36.0% and 33.6-52.1% compared with hNPK and fNPK, respectively. Therefore, combining PGRs with hNPK fertilizers could simultaneously maintain high production, reduce fertilizer use, and improve vegetable quality. 

Keywords:

Biomass, nitrate, nitrogen, phosphorus

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Agriculture
Pages: 676-679

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