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Uptake of NPK nutrients by yield of corn depending on nitrogen fertilization. Doctoral dissertation  [2010]

Latković, D. Univerzitet u Novom Sadu, Novi Sad (Serbia). Poljoprivredni fakultet [Corporate Author]

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The purpose of the study was to investigate the content and uptake of NPK nutrients by six corn inbred lines belonging to different FAO maturity groups, depending from nitrogen fertilization (control - without mineral fertilizer; 40 kg N/ha; 80 kg N/ha and 120 kg N/ha). At the same time the content of NO3-N in the soil was followed across the depth of the soil profile from 0 to 120 cm in the spring, before planting and in the autumn, after the harvest of the corn lines. Research was conducted at a multiyear stationary field experiment owned by the Institute of Field and Vegetable Crops in Novi Sad (Serbia) at the location of Srbobran during the period from 1996 to 1999 on carbonated chernozem soil type. The average N content in plant material for all corn lines tested and all variants of fertilization during the four years of trial was 1%. The average content of phosphorus in the whole corn plant for all lines, fertilization variants and years of the study was 0.20%. The highest potassium content was find in stalk (0.84%), in cob (0.65%) and in grain (0.44%), respectively. The yearly nitrogen uptake by grain, cob and stalk depended on corn line, quantity of nitrogen fertilizer applied, as well as from the year of experiment. The average total uptake during four year period was 87.08 kg N/ha annually, out of which the uptake by grain was 56.16 kg n/ha. The shape of the curve of the effect of nitrogen fertilizer applied on the amount of nitrogen uptake by gr
ain was characteristic for quadratic regression. The average yearly uptake of phosphorus during the four year period of the study was 18.15 kg/ha.