Effect of spraying number with potassium and liquid humate on (2) oil yield and chemical composition of Indian mustard Brassica juncea (L.) Czern. and Coss.

A study was conducted during two growing seasons of 2011/ 2012 and 2012/2013 in a private orchard at Abu Al- Khaseeb district, Basrah, to study the effect of number of spraying with potassium and liquid humate and their interactions on oil yield of Indian mustard plant Brassica juncea (L.) Czern. and Coss .and its chemical composition. The study Included 18 factorial treatments, which were the combinations of three potassium concentrations 0, 1.5 and 3.0 ml.l.-1 , three liquid humate concentrations 0, 50 or 70 ml.l.-1 spraying once or twice. Complete Randomized Block Design in a factorial experiment was used with three replicates. Treatment means were compared according to the Least Significant Difference (LSD) at 0.05 levels . Results showed that, plants sprayed with potassium at 3.0 mg l-1 gave significant increases in oil p ercentage (27.9% and 30.1%), oil yield. plant-1 (14.7 and 16.5g) and productivity of oil. hectare-1 (527.8 and 591.0 kg) for the two growing seasons, respectively. On the other hand, plants sprayed with liquid humate at 70 mg l-1 gave significant increases in oil percentage (28.8 and 30.6%), oil yield. plant-1 (15.8 and 17.8 g) and productivity of oil. hectare-1 (567.1 and 635.9 kg) for both growing seasons, respectively. Meanwhile, plants sprayed twice gave significant increases in oil percentage (26.4 and 28.8 %), oil yield.