%A Din, Intisar ud %A Sarwar, Muhammad %A Muhammad Jamil Khan, Qudrat Ullah Khan, %A Din, Fakhar ud %A Din, Fasih ud %D 2018 %T 22. Onion (Allium cepa L.) yield and phosphorus use efficiency as affected by plant extracted humic acid application %K %X To study the effect of plant derived Humic acid (HA) on the nutrient use efficiency and yield of onion a pot experiment was conducted in a greenhouse of Land Resources Research Institute, National Agricultural Research Centre Islamabad, during year 2013. The experiment was laid out in Complete randomized design with two factor i.e. HA (150 mL 5 kg -1 and 300 mL 5 kg -1 ) and Phosphorus (P) levels (60 kg ha -1 P 2 O 5  (75 %) and 80 kg ha -1 P 2 O 5 (100 %). Soil application of plant derived HA @ 300 mL 5 kg -1 along with 80 kg ha -1 P 2 O 5 as Di-ammonium Phosphate (DAP) recorded the highest onion yield of 13.47 t ha -1 . However it was statistically at par with the treatment receiving 75% (60 kg ha -1 ) P application along with plant derived HA @ 150 mL 5 kg -1  soil. Secondly soil application of plant derived HA @ 300 mL 5 kg -1 along with 80 kg ha -1   P 2 O 5 showed highest content of  P (0.22%) in onion plant at maturity whereby HA @ 150 mL 5 kg -1 along with 60 kg ha -1   P 2 O 5 (75% RDF) registered highest content of N (4.1%). It may concluded from the result of the experiments that HA applied @ 300 mL 5 kg-1 integrated with Phosphatic fertilizers gave promising result and may be recommended for enhancing the onion yield and P and N concentration of soil. Keywords : Humic acid; Onion; Phosphorus; Nutrient concentrations; Yield http://dx.doi.org/10.19045/bspab.2018.70073 %U https://thepab.org/index.php/journal/article/view/477 %J Pure and Applied Biology (PAB) %0 Journal Article %P 590-594%V 7 %N 2 %@ 2304-2478 %8 2018-05-19