Impact of bio-fertilizer and nano iron and chelated iron in the growth and production of cayenne pepper

An experiment was carried out inside in 2020-2021 season to study the effect of three fertilizer usage on plant growth and yield of chili peppers under plastic tunnel conditions. The treatments included as soil fertilizer application with Bio-health with three treatments (seed pollination, dipping seedlings, and soil injection with Bio-health), as a foliar fertilizer with Nano-iron (0, 0.75, 1.5 gm. L−1) and chelated iron (0, 5, 10 gm. L−1). Three levels of both Nano and chelated iron, The experiment was laid out in a randomized complete block design (RCBD) with three replications. The results showed that: The treatment of nano scale iron (1.5 g. L−1) was significantly higher by giving the highest averages of nitrogen, phosphorous, potassium, iron, zinc and manganese elements absorbed by plant leaves, which amounted to (3.13% ‘0.40%, 2.3%, 110.31 g. kg−1, 15.02 g. kg−1, 51.38 g. kg−1) respectively, while the treatment of chelated iron (10 g. L−1) was significantly superior and gave the highest averages for the above elements as (2.95%, 0.38%, 2.09%, 94.86 g. kg−1). 13.55 g. kg−1, 45.60 g. kg−1) respectively, and the treatment of biological fertilizer (injection into the soil) significantly outperformed its administration with the highest averages reaching (2.92%, 0.39%, 2.15%, 96.64 g. kg−1, 13.86 g. kg−1, 47.10 g. kg−1) respectively. The present study revealed that there was variability among the used fertilizers, showing that it could be used for further improvement in growth and yield.