EFFECTS OF NITROGEN SUPPLY ON RATE OF WEIGHT OF STRAW AND EAR AND ON THE CHLOROFILL CONTENT OF THREE WINTER WHEAT VARIETIES PUBLISHEDIstván KRISTÓ - Melinda TAR – Katalin Irmes - Péter JAKAB - István Mihály PETRÓCZI firstname.lastname@example.org
The aim of our study was to determine the effect of N fertilization on the proportion of straw and ear of three winter wheat varieties, and to demonstrate the possibility of using Hydro N-Tester in precision crop production. Our experiments were carried out in Szeged – Öthalom on 10m2 experimental plots, three winter wheat varieties (GK Békés, GK Csillag, GK Petur), in two growing seasons (2010/2011, 2011/2012), 2 fertilizer treatment per growing season, with 3 repetitions, random block arrangement. To determined the rate of weight of straw and ear in the full ripening of winter wheat, right before harvest samples were taken, in 3-3 replications for varieties and treatments. The relative chlorophyll concentration of the wheat leaf was measured using a Hydro N-Tester portable chlorophyll measuring instrument. Measurements were made for N-treatments and wheat varieties in the first year, four (April 6, April 15, May 5, May 17), and the second year at three times (April 18, May 4, June 7). We can conclude, that the rate of weight of straw and ear was hardly changed by fertilizer treatments, but rather the characteristics of varieties were enforced. Comparing the varieties in both years (2010/2011, 2011/2012)and in both fertilizer treatments, we found that the highest rate of weight of straw and ear was in GK Csillag variety and the lowest rate of weight of straw and ear in GK Petur variety. Hydro N-Tester is suitable for determining the N-supply of winter wheat, as a top dressing after a week was able to be measured in the leaves the change of chlorophyll amount. The values obtained with the Hydro N-Tester depend not only on the amount of N applied, but also on the varieties. It would be advisable to carry out more of these tests to detection the characteristics of the winter wheat varieties.
winter wheat, nitrogen fertilization, N top dressing, rate of weight of straw and ear, Hydro N-Tester
Field crops and pastures