Uptake and utilization of nitrogen added through the aboveground organs at heading time of wheat
1983
Djokic, D. (Institut za strna zita, Kragujevac (Yugoslavia))
This paper investigates the capability of wheat crop to accept and utilize nitrogen added in earing through the above-ground organs, in the quantities that start causing leaf damages. The following wheat varieties were used in the investigation:Kg-56,Morava,Novosadska rana 2, Sava and Zlatna dolina. The N content in the 3 top leaves in the blooming stage increased, due to foliar top-dressing, from 2.55 to 3.44%, or expressed relatively, by 34%. The content and quantity of N in the above-ground parts increase too. The N share of single organs in the total quantity of N in the above-ground parts did not change notably under the influence of top-dressing. This was the average for all varieties. In full maturity, the quantity of N in the above-ground parts increased by 55-71 kg N/ha, due to top-dressing in earing. The ratio between the N concentration in the grain and in the straw, as well as in the distribution of N between the grain and straw did not change notably under the influence of foliar top-dressing. Concentrations and quantities of N in the straw were higher in the variants top-dressed with N in earing. The quantity of N in the above-ground parts in the after-blooming period increased by 39 kg N/ha in the control and 56 kg N/ha in the variants top-dressed with N in earing. Uptake of N by the wheat crop increased by 35%, expressed relatively, that being the average for all varieties. The increase of the dry matter in the above-ground parts in the period between blooming and maturing was somewhat higher in the variants with foliar top-dressing in earing. In case of foliar top-dressing, variety differences in the content and quantity of N in the above-ground organs came into prominence.
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