Impact of Humic Acid and Nitrogen Fertilization Treatments on Productivity and Grain Quality of Some Barley Varieties

Abstract

The study aims at evaluating humic acid application and nitrogen fertilization treatments viz., control, nitrogen foliar application (4%), 30 kg N fad -1 , 30 kg N fad -1 + N foliar application (4%) and 60 kg N fad -1 on productivity, grain quality and nitrogen use efficiency (NUE) of three barley varieties. In addition, the yield analysis of the three barley varieties viz., Giza129, Giza131 and Giza135 was investigated. Humic acid application enhanced barley productivity, quality and NUE. Giza131 surpassed the other two varieties in grain yield, some components and NUE in both seasons except protein content. Raising N level up to 60 kg Nfad -1 had a significant impact on all studied traits compared with control treatment, except NUE. Co-application of 30 kg N fad -1 +N foliar application improved barley yield, most of its attributes, grain quality and NUE, which reflect the efficacy of N foliar application in fulfilling barley nitrogen requirements with the soil N applications. Additionally, path analysis indicated that: the grain number spike -1 had the highest direct effect on the grain yield among the varieties Giza129 and Giza131, the highest indirect effects on grain yield were assigned for grain weight spike -1 and spike number m -2 , while spike numberm -2 had the greatest direct effect on the yield of Giza135, which demonstrates the importance of these traits in improving barley grain yield.

Response of some Cultivars of Barley to Humic Acid under Saline Soil Conditions - Siwa Oasis

“…In the first season, grain yield kg/ha ranged greatly from 3119 (0 kg/ha) to 3871 (3 kg/ha), and in the second season, it ranged significantly from 3005 (0 kg/ha) to 3733 (3 kg/ha). Additionally, in this regard, the varietal differential for grain yield was reported by (Zahraa et al 2022, Salwa and El-Sanatawy. 2022and Amer et al 2020.…”