Effect of Humic Acid and the Level of Nano and Traditional Nitrogen on the Growth and Yield of Potato

Abstract

A field experiment was carried out at the Agricultural Research Station of the University of Anbar-College of Agriculture in the autumn season of 2021 in soil with Sand Clay Loamy textures. To find out the effect of humic acid and the level of nano and Traditional nitrogen on the growth and yield of the potato variety Rivera, the experiment included two factors: the addition of humic acid (H1) at the level of 100 kg ha−1 as well as the comparison and the second factor adding nitrogen sources and their levels, which included the addition of nanonitrogen Nn1, Nn3, Nn2 At level 15, 30, 45 kg N ha−1 and Traditional nitrogen NT1, NT2 at level 150, 300 kg N ha−1 as (urea fertilizer) sequentially. The RCBD was randomized complete block design with three replicates. The results were statistically analyzed and the means of the coefficients were compared at the 0.05 probability level to test for the least significant difference. The results were the following: (1) The addition of humic acid positively affect most of the plant traits. The levels of the treatments of Nano and Traditional fertilizers (urea) and the two interactions recorded a significant increase in most of the studied traits. (2) Nano nitrogen Nn3 treatment achieved the highest rate of plant height, chlorophyll content in leaves, total tuber yield, total number of tuber, and the yield of the dry matter of the vegetative compared to the comparison treatment, while the NT2 urea treatment achieved an noticeable increase in some traits such as the number of aerial branches and the yield of the dry matter found in tubers and starch yield due to their high added quantities. (3) The two-interference treatment achieved the highest value of the fertilization efficiency of production 70.12% when treating the addition of nano-nitrogen with humic acid Nn3H1, and the single nano-nitrogen Nn3 treatment achieved a fertilization efficiency of 68.89%.