Fig. 7
Relationship between brown rice yield and silicic acid absorption by rice plants in the paddy field experiments conducted in 2018 (y = 6.97x − 51.50, R2 = 0.94, P < 0.001) and 2019 (y = 6.58x − 64.58, R2 = 0.87, P < 0.001). Closed diamonds indicate experimental paddies with low available phosphate in post-experiment paddy soils (< 0.15 g kg−1) and open diamonds indicate those with high soil-available phosphate (≥ 0.15 g kg−1)