The linear range of the OTA sensor was from 0.19 to 15.63 nM, and the limit of detection (LOD) was 0.19 nM; the linear equation was F = 7174.24 − 65.42COTA(nM), with a linear correlation coefficient of 0.987. The linear range of the K+sensor was from 0.24 to 15.63 µM, and ...
As nutrient availability depends on soil pH, farmers who grow crops on tropical acid soils resort to excessive fertilisation to replenish K+. However, the excessive use of chemical fertilisers will not benefit the agricultural sector, because this practice degrades the soil quality with time. More...