Effect of nitrogen doses on yields of mixtures pea with spring barley
2007
Ksiezak, J.,Instytut Uprawy Nawozenia i Gleboznawstwa, Pulawy (Poland). Zaklad Uprawy Roslin Pastewnych
Getting new knowledge about relations between content of semi leafless variety of pea cultivated in a mixture with spring barley and the level of nitrogen fertilization was the aim of the research work. The field experiment with a mixture of pea (Ramrod variety) and barley (Rataj variety) was conducted in the years 1998-2000 at the Experimental Station in Grabow (Poland). In this experiment the level of fertilization (kg/ha): N1 - 0, N2 - 30, N3 - 60, N4 - 90 was the 1st rank factor and the percentage of pea in a mixture: 30, 40 and 50 percent was the 2nd rank factor. In order to determine the amount of biologically fixed nitrogen by pea cultivated in a mixture with barley a special OECD (Organization for Economic Co-operation and Development) method for nutrient balance calculation on the field level was used. 30 kg/ha is a sufficient rate of nitrogen for mixtures of semi leafless variety of pea Ramrod with barely cultivated on very good rye complex. Increase of pea percentage in a mixture from 30 to 50 did not significantly influence the level of yielding of a mixture independently on the level of nitrogen fertilization. Nitrogen fertilization of a mixture in rates between 30 and 90 kg/ha decreased the percent share of pea in the yield, however this decrease was stronger in a year with more favourable distribution of precipitation than in conditions of poor humidity. Increase of nitrogen fertilization of a mixture up to 90 kg/ha significantly reduced the process of symbiotic nitrogen fixation by pea. Each 10 kg of nitrogen applied in a rate 30 and 60 kg/ha decreased the amount of nitrogen fixed symbiotically by 8 kg/ha, whereas in a rate of 90 kg/ha decreased even by 9 kg/ha
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