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| Remediation Effect of Crop Straw on Continuous Cultivated Organic
Substrate in Solar Greenhouse |
| SONG Wei-jiao，LI Yan-su，YAN Yan，YU Xian-chang，HE Chao-xing * |
| Institute of Vegetables and Flowers， Chinese Academy of Agricultural Sciences， Beijing 100081， China |
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Abstract The soil fertility of organic substrate is severely declined by continuous cultivation in
facilities．In order to maintain the sustainable cultivation and utilization of organic substrate, rotten
straw is added to continuous cultivated organic substrate in solar greenhouse．This paper studied the
remediation effect of adding straw on continuous cultivated organic substrate．The results show that the
bulk density of organic substrate added with composed straw decreased by 25.0%-30.4%，compared to
continuous cultivated organic substrate，the total porosity is increased，and the substrate organic matter
contents are increased，which will increase along with the increase of straw application quantity．The
available N，P，K contents in substrate are all increased by adding straw．The total N，P contents and
available N，P of organic substrate∶maize stalk=1V∶2V is the highest．By adding straw the substrate
temperature in the morning of spring is 0.80-1.50 ℃ higher than that of continuous cultivated organic
substrate．Whereas the oxygen concentration is declined remarkably，and organic substrate∶wheat
straw = 1V∶2V is the lowest．By adding straw to continuous cultivated organic substrate，the plant
growth，chlorophyll contents and root system vigor of cultivated cucumber are remarkably improved，its
yield is increased and fruit quality is also improved．The cucumber yield in the treatment with organic
substrate∶wheat straw= 1V∶1V is the highest，which is increased by 20.87% than that of the continuous
cultivated organic substrate．Therefore，adding straw to continuous cultivated organic substrate can
significantly improve the physicochemical characteristics of organic substrate，and increase the yield of
cucumber．The comprehensive result of treatment organic substrat e∶wheat straw = 1V∶1V is the best.
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Received: 12 May 2013
Published: 20 August 2013
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