Effect of Partial Replacement of Nitrate in Solution by Amino Acid and Urea on Accumulation of Nitrate in Non-heading Chinese Cabbage and Lettuce

doi:10.7668/hbnxb.2008.06.047

Abstract

Abstract: Under liquidculture conditions,different mixture of glycine(Gly),isoleucine(Iso)and proline(Pro)and urea used as partial(20 %)replacement of nitrate in solution reduced content of nitrate of nonheading Chinese cabbage(Brassica campestris ssp.chinensis(L.)Makino cv.huawang)and lettuce(Lactuca sativa L.cv.boli)12 d before harvest,however,top yields were not affected.Gly had the best reducing results,while the mixture of Gly,Iso and Pro in the next place,the number of partial replacement times of nitrate by amino acid in lettuce and nonheading Chinese cabbage was 1 and 2,respectively,vegetables were harvested 3 d after treatment,total-N in leaves increased significantly(p<0.05).Capacity of assimilation of urea was higher in nonheading Chinese cabbage than in lettuce,The effects showed that reducing nitrate effects of amino acid and urea in nonheading Chinese cabbage were almost the same,but using amino acid was more effective than using urea in lettuce,amino acid has much more effective than urea in lettuce.

Key words: Nonheading Chinese cabbage, Lettuce, Amino acid, Urea, Nitrate

CLC Number:

S143.1

GAO Xiu-rui, CHEN Feng-min, DIAO Chun-ying, PAN Xiu-qing, WU Yan-rong, LI Bing, CHEN Gui-lin. Effect of Partial Replacement of Nitrate in Solution by Amino Acid and Urea on Accumulation of Nitrate in Non-heading Chinese Cabbage and Lettuce[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2008, 23(6): 208-211. doi: 10.7668/hbnxb.2008.06.047.

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