A CONTRIBUTION TO THE QUESTION OF THE EFFECT OF RADIOACTIVE RADIATIONS ON PLANT GROWTH AND YIELD (in German)
The stimulating effect of small doses of P/sup 32/ and Ca/sup 45/ as well as the effect of radioactively labelled superphosphate on plant growth was examined in vitro on oats and summer barley. A 24-hour soaking of oat grains in a radioactive solution of NaH/sub 2/PO/sub 4/ and Ca(NO/sub 3/)/sub 2/ with activities of 55 and 71 mu c Ca/sup 45/ and P/sup 32//1, respectively, did not produce a verifiable yieid increase either in sandstone or limestone soil. Similar results were obtained in experiments with radioactively labelled superphosphate given in quantities of 0.270 and 0.846 g P/sub 2/O/sub 5/ with a specific activity of 0.4 mc P/sup 32// P/sub 2/O/sub 5/. In three cases of slight yield increase, the results could not be verified. In one case, after 41 days of growth, differences were found between inactively and radioactively fertilized plants, but these differences had disappeared by the time the plants were ripe. In addition, experiments are described which permit conclusions on the sensitivity of summer barley, maize, and bush beans to higher doses of P/sup 32/. With summer barley, clear signs of radiation damage appeared with 350 mu c P/sup 32/25 1 and a specific activity of 2 mc P/sup 32//g P/sub 2/O/sub 5/. Experiments in vitro with summer barley in silicic sand revealed that an addition of P/sup 32/ with a speciflc activity of 6 mc P/sup 32//g p/sub 2/O/sub 5/ caused complete destruction, in the bifoliate stage as well as at the time of sprouting. An increase in the specific actiaity of P/sup 32/ (3 to 6 mc/g an increase in the extent of plant damage. The characteristics of this P/sup 32/ damage are growth inhibition of the youngest leaf, chlorophyll defects (marbling), and increased side-sprouting. Maize showed radiation damage at 2 mc P/sup 32//g P/sub 2/O/sub 5/ in experiments in vitro with silicic sand. On the other hand, bush beans showed no exernal changes even at 4 mc P/sup 32//g P/sub 2/O/sub 5/. However, they had a lower yield than the control plants. (auth)
- Research Organization:
- Universitat Jena, Germany
- NSA Number:
- NSA-12-009578
- OSTI ID:
- 4338698
- Journal Information:
- Atomipraxis, Journal Name: Atomipraxis Vol. Vol: 4
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
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