Mohamed Sami Elsaka, Tamer Khalifa and Heshm AboElsoud( 2019). Impact of Fulvic Acid and Nitrification Inhibitor on Wheat Production and NO3-N losses in Clay SoilEnv. Biodiv. Soil Security, Vol. 3, pp. 241 - 254 (2019)
Abstract: TWO field experiments were conducted at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, Egypt, during two successive seasons (2017/18 and 2018/19) to study the effect of fulvic acid and nitrification inhibitor on NO3 leaching and wheat productivity. The split plot design with three replicates was used with three doses of fulvic acid (i.e., 0, 4.76 and 9.52 kg ha-1), whereas the main plots represented bynitrogen fertilizerswith and without nitrification inhibitor at rate of 90, 135 and 180 kg N ha-1 in sub-plots. Nitrification inhibitor 3, 4-dimethylpyrazole phosphate (DMPP) was applied at rate of 8%. Results indicated that the highest mean values of soil salinity (EC), OM and available NPK were obtained from soil in plots received 180 kg N ha-1 with DMPP + 9.52 kg fulvic acid ha-1. The highest mean values of plant height (110.34 and 111.42 cm), 1000-grain weight (55.60 and 61.00 g), grain yield (7.62 and 7.95Mg ha-1); straw yield (13.64 and 14.02Mg ha-1); N concentration in grain and straw (2.09 and 0.84 %, respectively),N content of grain (152.97 and 149.56 kg N ha-1); N content of straw (99.51 and 95.58 kg N ha-1) and total N uptake by wheat (252.49 and 245.14 kg N ha-1) were recorded by 180 kg N ha-1 combined with 8% DMPP + 9.52 kg fulvic acid ha-1 in first and second seasons, respectively. Meanwhile, the lowest leaching values in both seasons were achieved in plots received 90 kg N ha-1combined with 8% DMPP + 9.52 kg fulvic acid ha-1 after 4th irrigation. Based on the results of the current study, the combinations of fulvic acid and nitrogen fertilizer with DMPP can be considered as integrated nutrient management to improve the soil fertility and wheat productivity and save the environment from pollution.
Keywords: (Fulvic acid, Nitrification inhibitor, N leaching, Wheat productivity.)
