An effect of a fortified fertilizer by γ-PGA on the yield and quality of potted Brassica chinensis was studied by XU Zongqi etc.．
The results showed that the contents of chlorophyll，above ground fresh weight，nitrate，vitamin C and ammonium nitrogen with γ-PGA treatment had remarkable differences compared with the control． Under normal fertilization，the treatment with 50 mg /kg of γ-PGA led to significant increasing of chlorophyll under ground fresh weight compared with the control．
In particular，the production of above ground fresh weight was increased by 8. 8% ． The efficiency of ammonium nitrogen
and nitrogen was improved by 10. 6% ． The nitrate content decreased by 44. 8% and the content of Vc increased by 18. 1%，by using 100 mg /kg of γ-PGA ．
When nitrogen fertilizer reduced by 15% ，the treatment of 20 mg /kg of γ-PGA improved the nitrogen use efficiency by 10. 2% － 11. 6% ．
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