Publication Date:
2022-05-25
Description:
Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here by for personal use, not for redistribution. The definitive version was published in Scientia Horticulturae 195 (2015): 67-83, doi:10.1016/j.scienta.2015.08.041.
Description:
Organic vegetable cultivation under plastic greenhouse conditions is expanding rapidly in the
suburb of big cities in China due to the increasing demand for organic, out-of-season green
vegetables and the sustainable development of agriculture. Phosphorus (P) is not only an important
plant nutrient, but also a major contaminant in the water environment. However, information on the
accumulation and distribution of P in organic vegetable soils under plastic greenhouse conditions is
limited, relative to the open cultivation systems. Therefore, twenty-six plastic greenhouse vegetable
soils (PGVS) were selected randomly from four representative organic vegetable cultivation sites
located in the suburb of Nanjing, China. For comparison, 15 open vegetable soils (OVS) near the
PGVS with similar soil and cultivation practices were selected. Soil pH, organic matter (OM) and
the various P accumulation characteristics were investigated. We found that soil pH in PGVS were
significantly decreased by 0.57~1.17 unit with obvious signs of acidification, compared with that in
OVS. Soil OM was different for different sampling locations, but in general it was higher in PGVS
than OVS. Soil total P (TP), inorganic P (Pi) and Olsen-P of PGVS were higher than those in the
OVS. Olsen-P of all soil samples were far above the recommended optimum value of 20 mg kg-1 for
field crops, and over 60% soil samples were considered excessive (〉150 mg kg-1 ) in the PGVS and
OVS. There were significant correlations between total P, available P and soil pH in those vegetable
soils. Al-P/Fe-P ratio was also significantly correlated with vegetable soil pH (YpH = 7.44 - 1.32
XAl-P/Fe-P, r = - 0.705, p 〈 0.01). Soil total Pi was negatively correlated with soil pH in vegetable
soils (r = -0.328, p 〈 0.05), but the interactive effect of soil various Pi and soil pH need to be further
investigated through a series of controlled tests. Our results suggest that the rapid P accumulation
and acidification make the current plastic greenhouse vegetable production in the study area
unsustainable and better organic manure management practices need to be implemented to sustain
crop yields while minimizing the impact of vegetable production on the environment.
Description:
This work was supported by the National Natural Science Foundation, China (grant no.
41571286; 51479055); Open Research Fund Program of State Key Laboratory of Soil and
Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008,
China (grant no.Y412201419); and the Fund of Jiangsu Overseas Research ＆ Training Program
for University Prominent Young ＆ Middle-aged Teachers and Presidents.
Keywords:
Phosphorus accumulation
;
Soil acidification
;
Organic farming
;
Vegetable soils
;
Plastic greenhouse
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
Format:
application/pdf
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