Skip to main content

Humic acid applications to lettuce do not improve yield but do improve phosphorus availability

Buy Article:

$63.00 plus tax (Refund Policy)


The effects of humic acid (HA) and phosphorus (P) applications on plant growth and nutrient content of lettuce, together with available soil phosphorus remaining after harvest were examined. The amounts of phosphorus used were 0, 120, and 240 kg ha -1 and those of humic acid were 0, 100, 200, and 300 kg ha -1 . Phosphorus increased the nitrogen content of lettuce significantly (P<0.01) while the application of humic acid did not have significant effect. Humic acid, phosphorus, and HA×P interaction increased the nitrogen content of lettuce significantly (P<0.05). All effects were not significant for plant K, Ca, Mg, Fe, Cu, and Mn contents. Application of phosphorus decreased Zn content significantly (P<0.05). Increased amount of phosphorus caused significant increases in residual soil phosphorus (P<0.01). It was concluded that the application of 120 kg ha -1 of phosphorus together with 300 kg ha -1 of humic acid was convenient for the head weight of lettuce.

Keywords: Nutrient content; plant growth

Document Type: Research Article


Affiliations: Department of Soil Science, Agriculture Faculty, Yuzuncu Yil University, TR-65080, Van, Turkey

Publication date: 2005-03-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more