Two-year field experiments (2008-2010) were conducted at the Didactic and Experimental Station in Timişoara. Research objects were the influence of total doses, time and spliting of nitrogen on the protein content of Annabell two row spring barley variety. The various treatments were laid down in a randomized complete block design with three replications in the climatic conditions of Timişoara. We monitored four nitrogen doses, three splits applications (% from total nitrogen doses) and two times of nitrogen application in growth stage. The experimental crop was top dressed with the following amounts of nitrogen: 40, 60, 80 and 100 kg ha-1, then at growth stage these dosages were divided (30%, 50%, 70%), and the application have been made in one-stage: two leafs and three-stages: two leafs; boot stage; soothing stage. The control variant was not top dressed. Two row spring barley has to fulfill several quality demands to be fully accepted and paid by the malting industry. The variety has to be selected by the industry, the vitality of the lot has to be high, the husk has to be uninjured and the grain protein content has to be at the proper level and as even as possible. The average data obtained after two years of study indicate an increasing in protein content with increase in split doses of nitrogen and time of (N) applications. In 2008/2009 year crop, the lowest protein content was obtained in the variants fertilized with low doses of (N) in one-stage application while in three-stages application, the increase in protein content was on average by 11,3% (N0) to 13.2% (N100). In the 2009/2010 year crop we can see that, depending on the split nitrogen doses and timing of (N) applications, we could record an amplitude of the variation between 11.1% (N0) to 13.2 % ( N100).

spring barley; nitrogen timming; grain protein content; split applications

Presentation: oral