Effects of acute X-irradiation on grassland and different varieties of rye applied during the growth period

Grassland, 15 years old, was irradiated during the growing period 6 times with different doses of radiation and cut 4 times. Radiation affected growth in different ways, partly resulting in enhanced growth and partly in growth depression, fractionation of radiation playing a very dominating role. Furthermore, radiation effects are very much coupled with the temperature at the time of radiation. A simular examination was carried out with winter rye. The results are discussed in connection with temperature hardiness of the varieties and with regard. (GSE/LN)