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2009, vol. 46, iss. 1, pp. 73-80
Effects of seed inoculation and incorporation of different nitrogen rates on nitrogen fixation parameters
aInstitute of Field and Vegetable Crops, Novi Sad
bConcern Farmakom MB, Šabac
From the point of view of agricultural production, nitrogen deficiency in the soil results in significant yield losses and yield quality reduction. Symbiotic fixation of atmospheric nitrogen plays a significant role in the supply of plants with nitrogen. Soybean (Glycine max. (L.) Merr.) is one of the most important legumes in Serbia and the world, most notably because of the outstanding chemical composition of its grain. The objective of this paper was to use nitrogen fixation parameters to determine the optimum amounts of mineral nitrogen needed when growing soybean using inoculation with the biofertilizer NS-Nitragin. A trial on a chernozem soil was set up at the Bački Petrovac experiment field of the Institute of Field and Vegetable Crops using a randomized block design with four replicates. The soybean cultivar Balkan and four rates of nitrogen fertilizer (0, 30, 60, and 90 kg N/ha) were used in the experiment. Each of the nitrogen treatments had two variations, with and without inoculation. Just before sowing, the seed was inoculated the soybean biofertilizer NS-Nitragin. The effects of inoculation and different nitrogen fertilizer rates on the effectiveness of symbiotic association were determined at soybean flowering based on the number of nodules formed on the root and the dry matter weight and nitrogen content of the above-ground plant parts, root, and nodules. On an average for all the fertilization treatments, the above-ground weight of the inoculated plants increased by 19% relative to the uninoculated treatments, while the nitrogen content increased by 23%. The nitrogen content of the root system in the inoculated treatments increased by 15% relative to uninoculated plants, and the root system was also more developed (11%) in the former than in the latter. The incorporation of 60 kg N/ha before sowing along with inoculation produced the greatest above-ground and root weights as well as the highest nitrogen content of the above-ground parts and root. Inoculation had a positive effect nodule number (205% increase), weight (59% increase), and nitrogen content (60% increase). Inoculation accompanied by a nitrogen rate of 30 kg/ha produced the best nodulation and the largest weight and highest nitrogen content of nodules.
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article language: Serbian
document type: Original Scientific Paper
published in SCIndeks: 23/04/2009

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