EFFECT OF PRODUCTION FACTORS ON THE DRY-MATTER PRODUCTION AND YIELD COMPONENTS OF WINTER-WHEAT

The effect of production technology factors (fertilisation, forecrop, irrigation, soil cultivation) on the dynamics of dry matter accumulati on, the yield components and the yield in winter wheat was studied in a long-term experiment set up at the Latokep Experimental Nursery of D ebrecen University of Agricultural Sciences. The following conclusions could be drawn from the results: The dry matter accumulation of winte r wheat continued until the end of June under the experimental conditi ons in 1997, with an intensive period of accumulation between early Ma y and late June (Feekes scale 16-18). The effect of fertilisation rang ed from 5.0-9.6 t/ha after maize and 4.2-6.3 t/ha after peas, dependin g on the water supply. After maize NPK fertilisation had a decisive ef fect on the magnitude and stability of the yield. The yield increase w as due to improvements in spikelet number, number of grains per spike and grain mass per spike. No significant correlation was found between the,thousand grain mass and the yield average.