Effect of inoculation and nitrogen top-dressing on yield and fodder value of winter pea in wheat mixture

Dvogodišnjim istraživanjima (1999. do 2001.g.) utvrđivan je utjecaj učin-kovitosti bakterizacije sjemena ozimog graška i prihrane dušikom na broj i aktivnost kvržica na korijenu graška, te prinos zelene mase, suhe tvari i krmnu vrijednost smjese graška cv. Maksimirski ozimi i pšenice cv. Sana. Prije sjetve izvršena je predsjetvena bakterizacija sjemena graška s autohtonim sojem Rhizobium leguminosarum bv. viciae iz zbirke Zavoda za mikrobiologiju Agronomskog fakulteta Sveučilišta u Zagrebu. U utvrđivanju (25. 04. 2000. i 2001.) ukupni najveći broj kvržica na korijenu graška utvrđen je na bakteriziranoj varijanti (154), kao i aktivni broj kvržica 144. Prosječni prinosi zelene mase smjese iznosili su od 46,3 t ha-1 (kontrola) do 54,7 t ha-1 (bakterizacija). U ukupnom prinosu zelene mase, udio mase graška iznosio je od 28 % (prihrana dušikom) pa do 34 % (kontrola). Ukupni prinosi suhe tvari iznosili su od 11,65 t ha-1 (kontrola) pa do 13,25 t ha-1 (prihrana dušikom). U masi bakterizirane varijante 2 i kontrolne varijante 1 je utvrđen veći udio graška u suhoj tvari (29,6 i 28 %) u odnosu na dušikom prihranjivane varijante 3 (23,8 %) i 4 (22,5 %). Prinosi sirovih bjelančevina graška u 2001. g. varirali su od 196 kg ha-1 (kontrola) do 300 kg ha-1 (bakterizacija), a pšenice od 1 707 kg ha-1 (kontrola) do 2 111 kg ha-1 (prihrana dušikom). Ukupni prinosi sirovih bjelančevina smjese iznosili su od 1 903 kg ha-1 (kontrola) do 2 407 kg ha-1 (prihrana dušikom).Two year field trials (1999-2001) were carried out to determin the effect of seed winter pea inoculation and nitrogen top-dressing on number and activity of pea root nodules and also on the green mass and dry matter yield of winter pea cv. Maksimirski ozimi and wheat cv. Sana mixture. Just before sowing the inoculation of pea seeds was performed by the indigenous variety of Rhizobium leguminosarum bv. viciae which is part of the microbial collection of the Department of Microbiology at the Faculty of Agriculture University of Zagreb. In the investigation period (25th April, 2000 and 2001) the highest total nodule number on pea root was determined on the inoculated variant (154) as well as active nodule 144. Average mixture green mass yield were ranging from 46,3 t ha-1 (control) up to 54,7 t ha-1 (inoculation). Pea mass content in total green mass yield was from 28 % (nitrogen top-dressing) up to 34 % (control). Total dry matter yields were ranging from 11,65 t ha-1 (control) up to 13,25 t ha-1 (nitrogen top-dressing). Inoculated mass variant 2 and control variant 1 had (29,6 % and 28 %) a higher pea mass content in respect to nitrogen top-dressing variants 3 and 4 (23,8 and 22,5 %). Pea crude proteins yields in 2001 were ranging from 196 kg ha-1 (control) up to 300 kg ha-1 (inoculation) and for wheat, those values ranged from 1 707 kg ha-1 (control) up to 2 111 kg ha-1 (nitrogen top-dressing). Total crude proteins mixture yield were from 1 903 kg ha-1 (control) up to 2 407 kg ha-1 (nitrogen top-dressing)