The amounts of N and P accumulated in farmland soils of 50 cm depth were equivalent to the amount of chemical fertilizer supplied for 50-70 years. The values of N/P of surface soils in farmlands were 1.0-4.3, lower than expected. The median diameter of soil particles in run-off waters was generally less than 10 microm. The mean values of particulate fractions over 1 microm and over 0.22 microm were 19% for N, 27% for P, and 39% for N, 64% for P respectively. Fine particles of soil containing concentrated phosphorus should be carefully monitored as potential sources related to eutrophication.
: Water contamination 血 drainage Clitches due to soii puddling has been identified as a 皿 」 皿 portant problem a皿 d this stUdy investigated the fiitration of the resulting tuエbid waters . Bamboo coal was used as a filte 血 g material by absorbing the soil particles and other suspended materials from the tUrbid waters . In this research , effectiveness of different arrangement of barn [ boo coal in a modeled charmel was investigated . It was found out that tUrbid water filtration us 血 g 血 e net , commonly used for mandarin orange bags, was the most effective 皿 ethod . It is most probably because both the bamboo coal and the net adsorb the soil particles and the spaces betWeen them beeome se − dimentation traps. The arrangement of the bamboo coal hl the drainage area to allow space fbr sedimentation was also fbund important . K 砂 脚 rds ' 伽 r 鋸 } vaterspuriJficati ・ n ;Bam ゐ・ … al ∫ Filtering material Japan Rainwater Catohment Systems Assooiation ( JRCSA }
Abstract: This research was done to study the relationship the ef 驚 ct of method f ヒrtilization and rainfall intensity to the losses of nutrients in sulface off The results of this experiment showed that nutrients concentration in runoff of the parameters analyses that were significantly higher than that of original water , Ratios of contents of the most nu £rients ( T
This study used bamboo coal like fi 且 ter fbr clarificatien of turbidity in water and ca エried out with two laboratory experiments and one in sitU experiment . Objectives ofthe first laboratory experiment were (1) to assess the capabiliW of small , middle and big − sized bamb 。 o coal , and (2) to assess 血 e relationship be榊 e ¢ n inflow volume and turbidity of outflow . The results showed that , the smaU −sized gave the most decrease of turbidity values ;the next were the medium − and big − sized ones . With inflow volume of2L 〆 min , the tu エbidity was the least decreased followed by 6, 10and 14L/ min . The secQnd experiment used only smal 歪 一 sized and assessed the relationsllip between different volume of filter and turbidity of outflow . The results showed that high volume Qf filter can reduce turbidity more effectively than low volume . / n sittt experiment showed that turbidity in outfiow measure indicated the decrease Df30-90% and depended on concentration of turbidity in inflow and measure time . This study pointed out that bamboo coal can reduce the tUrbidity ofrunoffwater ,
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