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[Effects of DMPP-compound fertilizer on greenhouse celery growth and nutritional quality]
Shao-fu Wu1, Liang-huan Wu, Yi-meng Yin
1Key Laboratory of Environmental Remediation and Ecosystem Health of Education Ministry, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China. sf_wu@163.com
Abstract:
A field study with greenhouse celery (Apium graveolens L. ) showed that compared with basal application of ordinary compound fertilizer, one-time basal application of DMPP-compound fertilizer ( ENTEC , 12-12-17) at the rates of 67. 5 kg N x hm(-2) and 54. 0 kg N x hm(-2) increased the yield by 5. 78% and 10. 14% , respectively. The application of ENTEC also improved the nutritional quality of edible parts, e. g. , the Vc, amino acid, soluble sugar, N and P contents increased, while nitrate content decreased. Compared with basal plus side dressing applications, appropriately reducing the application rate and times of ENTEChad more beneficial effects on celery yield and quality, and reduced the production costs. ENTEC could suppress the transformation of soil NH4+ -N to NO3 - -N effectively, and thus, its application could retain soil residual N more in NH4+ -N than in NO3- -N form after celery harvested, resulting in a reduction of nitrate leaching.
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