Abstract:

In order to screen effective and low-cost cultivation measures for cadmium reduction, five treatments were set, including blank (A0), waterflooding (A1), zinc fertilizer + waterflooding (A2), lime + waterflooding (A3), and zinc fertilizer + lime + waterflooding (A4), using two sub-varieties of rice (V1, V2) with low cadmium as experimental materials. The effects of various measures on the agronomic traits and cadmium content of milled rice were analyzed. The results showed that except for excessive cadmium levels in V2 late rice A1 and A2 treatments, other cadmium reduction treatments had qualified cadmium content. The V1 material late rice A3 treatment had negative effects on the milled rice rate, effective panicle number, and yield. The V2 material late rice A3 treatment had negative effects on the aspect ratio and protein content. The A4 treatment had a negative effect on the chalky grain rate and chalkiness, while the negative effects of other treatments were not significant. Overall, when V1, V2 early rice and V1 late rice were treated with A1, V2 late rice was treated with A3, the cost was relatively low, and the cadmium content in polished rice did not exceed the standard. The impact on yield and rice quality indicators was relatively small, resulting in the best overall effect. After approval, V1 and V2 can be combined with supporting cadmium reduction cultivation techniques to promote and apply in moderately cadmium polluted rice fields in Guangxi.

Key words: Rice, Low accumulation of cadmium, Cadmium reduction measures, Cd content in milled rice, Agronomic traits