Growing sugarcane (interspecific hybrids of Saccharum spp.) under flooded conditions is an important management tool for decreasing soil organic matter loss in Histosols. But flooding often reduces crop yield. An experiment was conducted for 10 months in 38-L plastic pots to determine sugarcane yields and the rhizosphere properties in an organic soil under varying water-table levels and to relate soil rhizosphere properties with sugar production. Five sugarcane genotypes (representing a wide range in genetic characteristics) were grown under three water-table levels (0, 15 and 30 (drained) cm from the soil surface). Stalk dry matter and sugar yields were reduced when pots were flooded. Averaged across water- table treatments, genotypes had as high as a 60 % difference in rhizosphere soluble organic carbon (SOC), which indicates differential leakage of carbohydrates. Correlation analysis showed a negative relationship between sugar yield and SOC (r=-0.73, P

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There are differences between the EPA Method 365 and the APHA-AWWA-WEF’s Standard Method 4500 with respect to the post-digestion treatment procedures of the persulfate-digested water. The effects on total phosphorus analysis of different post-digestion treatment procedures, such as neutralization and reacidification, and shaking/settling, were investigated in this study using the total phosphorus measurements of water samples from the Everglades Round Robin (ERR) study and comparing the results with the ERR study. The effects of the insoluble particles or phosphorus adsorption/precipitation on/with Al and Fe hydroxides in different post-digestion treatment procedures adequately accounted for the differences between the most probable value and the higher or lower total phosphorus measurements reported in the ERR study. Based on the results of this investigation we recommend that a clearly defined set of digestion and post-digestion treatment procedures be adopted as the standard for total phosphorus analysis using the ascorbic acid method.
The effects of post-persulfate-digestion procedures on total phosphorus analysis in water |

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Modern water quality monitoring programs often include some field measurements that are measured at the time and location of water sample collection. Field measurement, as opposed to laboratory measurement, may be used if the analyte is unstable once removed from the water body or simply because such measurements are more cost effective or convenient to determine in the field. Typical field-measured water quality parameters include pH, specific conductivity, dissolved oxygen (DO), redox potential, and temperature, which may be assayed using individual or multiparameter portable instruments. Depending on the goals of a specific water quality monitoring program, other measurements (for which field test kits are available) may also be performed. Test kits covering a wide range of water quality parameters are commercially available. However, these are generally less sensitive with less rigorous quality control than those commonly performed in an analytical laboratory. With the advent of powerful microcomputers, novel software, data loggers, wireless communication networks, and new robust sensor designs, devices for autonomous realtime or near real-time field measurements have also been developed. These systems can be placed near or into a given water body and are programmed to conduct water quality tests automatically on a prescribed schedule or when triggered remotely. After connection to a wireless network, real-time measurements are instantly relayed to a central location for immediate operational decisions in response to water quality changes.

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