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Open AccessArticle

Reducing Phosphorus Fertilizer Input in High Phosphorus Soils for Sustainable Agriculture in the Mekong Delta, Vietnam

1
School of Agriculture and Aquaculture, Tra Vinh University, Tra Vinh Province, 126, Nguyen Thien Thanh, Tra Vinh City 87000, Tra Vinh Province, Vietnam
2
College of Agriculture, Cantho University, Campus II, 3/2 Street, Ninh Kieu District, Can Tho 94000, Vietnam
3
School of Environment and Natural Resources, The Ohio State University, Wooster, OH 44691-4096, USA
*
Author to whom correspondence should be addressed.
Agriculture 2020, 10(3), 87; https://doi.org/10.3390/agriculture10030087
Received: 20 February 2020 / Revised: 10 March 2020 / Accepted: 13 March 2020 / Published: 23 March 2020
(This article belongs to the Section Agricultural Soils)
High rates of phosphorus (P) currently being applied to soils for the production of vegetables in the Mekong Delta, Vietnam, has led to concern regarding negative effects on the economy and the environment. This research presents a comprehensive study on the determination of P supplying capacity in this region of Vietnam to examine the possibility of reducing P fertilizer input. In total, 120 soil samples were collected to evaluate total P and Bray 1 available P in the soils. Phosphorus maximum sorption, degree of P saturation, P release, and the effect of P fertilizer on corn (Zea mays L.) yield in greenhouses and fields were also determined. Total P concentrations in 57% of the soil samples evaluated yielded high P concentrations (>560 mg P/kg), while 74% of the samples had high Bray 1 available P concentrations (>20 mg P/kg soil). Maximum P sorption ranged from 149 to 555 mg P/kg soil, respectively, and had negative correlation with available P (r = −0.63*). The percentages of P saturation ranged from 0.63% to 5.5% and correlated with available P (r = 0.98**). Maximum P release ranged from 1.2 to 62 mg P/kg soil, respectively, and correlated with available P (r = 0.96**). Corn grown in soils with available P concentrations >15 mg P/kg did not respond to P fertilizer in greenhouse or field experiments. We conclude that many farmers in this region can reduce P fertilizer input, thus increasing their profits and reducing negative environmental impacts associated with excess soil P for sustainable agriculture. View Full-Text
Keywords: total P; Bray 1 available P; P sorption; P saturation; P release; P fertilizer input; corn yield total P; Bray 1 available P; P sorption; P saturation; P release; P fertilizer input; corn yield
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Thuy, P.T.P.; Hoa, N.M.; Dick, W.A. Reducing Phosphorus Fertilizer Input in High Phosphorus Soils for Sustainable Agriculture in the Mekong Delta, Vietnam. Agriculture 2020, 10, 87.

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