[Productivity of pea, barley and their mixtures and the relationship between the grain protein content and nitrogen fertilizer and nitragine]
2000
Auskalnis, A. | Dovydaitis, V. (Lithuanian Inst. of Agriculture, Dotnuva (Lithuania))
Field experiments were carried out at the Lithuanian Institute of Agriculture at the Department of Soil Management over the period 1995-1997. The objective the experiments was to investigate the variation of barley cv. 'Roland' and pea cv. 'Odin' seed yield and protein content in relation to the rates of ammonium nitrate applied to these crops. Furthermore, we compared the performance of semileafless pea cv. 'Odin' and spring barley cv. 'Roland' mixtures with the performance of the same pea and barley cultivars grown in pure stands. Average data of 1995-1997 suggest that pea-barley mixture was not superior to pure peas. In 1995 peas were significantly affected by lodging, and mixtures were harvested with smaller seed losses. Seed and protein yield was higher than that of pure peas. Barley grain grown in mixture with peas had by 0.5-1.4 percent unit higher protein content than pure barley. Fertilization of barley with N 90 increased protein content in grain by 0.6 percent unit, grain yield by 55.6 and digestible protein content by 70.5. Peas without nitrogen fertilizers were by 62.8 more productive than barley, and digestible protein content was 4.4 times higher. Only a moderate nitrogen fertilizer rate N 30 increased protein content in pea seed by 1.1 percent unit, but as compared with barley, pea seed contained 2.8-3.6 times more protein. Nitragine did not increase the pea seed yield either
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