The accumulation patterns of Na, K, Ca and Mg in tissue plants of shallots (Allium ascalonicum L) during its growth have been studied. In this experiment, local variety of shallots from Brebes farm, Central Java Indonesia was applied with two treatments of phosphate fertilizer (50 and 400 P2O5 kg/ha) . Nutrient elements were measured using Instrumental Neutron Activation Analysis (INAA) techniques. The samples were irradiated using thermal neutron flux 1.5 × 1013 n cm-2 s-1for 10 s and 2.5 min cooling times at the JRR-3 M Research Reactors of Japan Atomic Energy Research Institute. There is a tendency that during growth, K content in the bulbs increased until harvest time, and the concentrations were higher than Mg and Ca. Mg content of leaves increased until five weeks and then decreased until senescent time, their concentrations are higher than K and Ca. The addition of P2O5until 400 kg/ ha caused significantly difference in small amounts of Na in the bulbs and stems, K in the bulbs, stems and leaves, Mg in all parts of plants also Ca in the roots, stems and leaves. Na content of roots, bulbs, stem and leaves were smallest comparing with K, Ca and Mg.
While there have been many studies on radiation hormesis, it is a concern that the dosage rate is an important factor. In this test, we examined and observed dosage rates. Under the condition of 100 kV voltage and 1.8 mA current, we irradiated and observed white radish sprouts at low-level radiation of 0 mGy/day (control), 50 mGy/day for 10 days (total dosage 500 mGy), and 100 mGy/day for 5 days (total dosage 500 mGy) . Two weeks later, we measured plant growth, and it was statistically evident that the object of 100 mGy/day irradiation has grown longer compared with the other two groups that were examined (p<0.001) .