Effect of Sowing Rate of Italian Ryegrass Drilled into Pea Stubble on Removal of Soil Mineral Nitrogen and Autumn Nitrogen Accumulation by Herbage Yield
B. Kramberger1, A. Gselman1, S. Kapun2, M. Kaligaric3
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1University of Maribor, Faculty of Agriculture, Vrbanska 30, 2000 Maribor, Slovenia 2Institute of Agriculture, Štefana Kovaea 40, 9000 Murska Sobota, Slovenia 3University of Maribor, Department of Biology, Koroška cesta 160, 2000 Maribor, Slovenia
Pol. J. Environ. Stud. 2007;16(5):705–713
The experiment was carried out in Slovenia in 2002-03 and 2004-05. The experimental design was a randomized completed block, with four replicates. In the summer after pea harvesting, 10, 20 and 30 kg of Italian ryegrass ha-1 were drilled into minimally cultivated pea stubble, in which, on average, 12.5 pea grains m-2 were left among crop residues. The ryegrass/pea mixtures in our experiments took up the soil mineral nitrogen the most efficiently and accumulated the highest amount of nitrogen in the autumn herbage yield, at a seeding rate of 30 kg drilled Italian ryegrass. The differences among treatments regarding 0–60 cm soil NO3-N and NH4-N contents were highest at the first cut and decreased until March of the next year. In order to achieve efficient early and high N uptake of mineralized nitrogen, it is not recommended to lower the sowing rates of Italian ryegrass for drilling into pea stubble to reduce the high cost of catch crop seeds.