Runoff water quality characteristics in a small agriculture watershed

Nakasone, Hideo

doi:10.1007/s10333-003-0030-3

Cited by 12 publications

(7 citation statements)

References 3 publications

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“…The mean concentrations of TN and TP in irrigation return flow were 2.5 and 0.17 mg L À1 , respectively, for a 7.4-ha rice paddy watershed in Japan (Feng et al, 2004). The mean concentrations of NO 3 -N and TP in streamwater during irrigation periods were reported to be 1.5 and 0.20 mg L À1 , respectively, for a 205-ha mixed land use watershed composed of 25% paddies in Japan (Nakasone, 2003). TN concentrations in streamwater in a mixed land use watershed that contained paddies in China seldom exceeded 2.0 mg L À1 from early July to late October (rice full growing season; Gao et al, 2004).…”

Section: Resultsmentioning

confidence: 94%

Nutrient runoff from a Korean rice paddy watershed during multiple storm events in the growing season

Kim

2006

Journal of Hydrology

110

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Section: Resultsmentioning

confidence: 94%

Nutrient runoff from a Korean rice paddy watershed during multiple storm events in the growing season

Kim

2006

Journal of Hydrology

110

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“…It also threatens sustainable agriculture (Karlen and Sharpley 1994). The problem of over-application is present in Japan (Nakasone et al 2002Nakasone 2003). Farmers apply large amounts of nitrogen fertilizer to vegetables such as lettuce, cabbage and celery.…”

Section: Introductionmentioning

confidence: 99%

Effect on water quality in irrigation reservoir due to application reduction of nitrogen fertilizer

Nakasone

2009

Paddy Water Environ

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Until 1997, tea farmers in the Makinohara district of Shizuoka Prefecture, Japan, applied around 1.2 ton/ha of nitrogen fertilizer per year to their tea fields. In general, uptake amount of nitrogen by tea plants is around 300-350 kg/ha. Then some part of the remainder of nitrogen fertilizer leach into ground water and flow out into the river. The other part of remainder of nitrogen fertilizer is accumulated in the soil layer. Following a recommendation by the local government, this amount was then gradually decreased to 660 kg/ha in 1999 and 540 kg/ha in 2000. Although nitrate nitrogen concentrations in local ground and river water have decreased, they remain high today. The river water runs off from a watershed in the Makinohara area and enters a small irrigation reservoir called Tanno Reservoir, where it has caused deterioration of the water quality, that is, acidification of the reservoir. In Japan, environmental standard for nitrate nitrogen is 10 mg/L in public water body and ground water. Here, the author developed the Water Quality Tank Model, and applied this model to investigate the nitrate nitrogen concentrations in the rivers and an irrigation reservoir called Tanno. The author applies these findings to demonstrate that nitrogen concentrations continue to remain high due to nitrogen accumulation in the soil layer, and that the amount accumulated would be reduced by a reduction in application. The simulation results demonstrate a small decrease in accumulation in the soil layer, and thus that the present high nitrate nitrogen concentrations will continue in ground, river and reservoir water will decrease only gradually.

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“…In juvenile grass carp (Ctenopharyngodon idella), elevated densities are associated with slowed growth, reduced immunity, and decreased antioxidant capacities [7]. Additionally, high density adversely impacts the growth and digestive enzyme activity of juvenile crayfish (Procambarus clarkii), eliciting notable alteration in the content of proteins, fats, glucose, and urea nitrogen in response to the escalated farming density [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Stocking Densities on the Growth, Antioxidant Status, and Intestinal Bacterial Communities of Carp in the Rice–Fish Co-Culture System

Diao,

Jia,

Hou

et al. 2024

Fishes

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Common carp (Cyprinus carpio) is a freshwater fish commonly farmed in rice fields, yet there were few studies on the intestinal functions and microbial community structure of common carp in the rice–carp co-culture system. Therefore, this study aimed to explore the effects of different stocking densities on the growth, antioxidant status, and intestinal bacterial composition of common carp in this system. This study was divided into three different stocking densities, including low density (LD, 10 fish, 52.9 g/m2), medium density (MD, 20 fish, 105.8 g/m2), and high density (HD, 30 fish, 158.7 g/m2), with a culturing period of 60 days. The results indicated that HD treatment inhibited the growth of common carp, as evidenced by the reduced final weight, WG, and SGR. In serum, the TG content in the HD group and the Cor content in the MD group were significantly increased. Meanwhile, HD treatment induced oxidative stress, manifesting specifically as increased SOD and CAT activities in the intestine or serum while reducing Gpx, GSH, and T-AOC in the serum. The 16S rDNA analysis indicated that the Simpson and Shannon indices of intestinal microbiota in the HD group were significantly higher than those in the LD group. At the phylum level, Proteobacteria, Cyanobacteria, and Firmicutes were dominant microbial communities in two groups. In addition, there was a significant difference between the two groups in the abundances of Actinobacterota and Bifidobacterium. Based on growth performances, biochemical indicators, and microbial diversity in rice–carp co-culture, low density (52.9 g/m2) may be more suitable in the rice–carp co-culture systems. In summary, this study contributes to a better understanding of common carp response to different stocking densities in the rice–carp co-culture system.

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Runoff water quality characteristics in a small agriculture watershed

Cited by 12 publications

References 3 publications

Nutrient runoff from a Korean rice paddy watershed during multiple storm events in the growing season

Nutrient runoff from a Korean rice paddy watershed during multiple storm events in the growing season

Effect on water quality in irrigation reservoir due to application reduction of nitrogen fertilizer

Effects of Different Stocking Densities on the Growth, Antioxidant Status, and Intestinal Bacterial Communities of Carp in the Rice–Fish Co-Culture System

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