The Effect of Organic and Biofertilizers on Carbon and Nitrogen of Biomass in Soil Seasoned with Broccoli

Abstract The purpose of this experiment is to examine the impact of organic fertilisers and biofertilizers on the carbon and nitrogen biomass during the blooming and full maturity stages in broccoli-planted soil. The experiment was conducted in a field in the Al-Nouriya district of Al-Diwaniyah Governorate in 2023, on a clay-silty soil mixture. The researchers used a Randomised Complete Blocked Design for the factorial experiment. (R.C.B.D) with three replicates. The first factor included the addition of biological fertilizers ( Pseudomonas fluorescens bacteria and Trichoderm harzianum fungi) which coded by (F, B) respectively, while the second factor is addition of organic fertilizer with one level (10 tons ha −1 ) (Yellow corn cobs, rice straw, and wheat waste) which coded (O 1 , O 2 , O 3 ) respectively. The third factor included adding two levels of seaweed extract (20 and 40) kg ha −1 , coded (A 1 and A 2 ) respectively, in addition to the comparison treatment. (Without adding fertilizer). During the maturity and blooming stages, the fertiliser combination (FO2) had the highest value of biomass carbon at 221.1 and 248.6 mg C kg soil −1 , respectively, indicating that the additional fertilisers significantly affected biomass carbon and nitrogen. During the blooming stage, the nitrogen content of the soil reached 71.02 mg N kg −1 , while at full maturity, it reached 91.47 mg N kg −1 , all thanks to the fertiliser combination (BO2).