Changes in nitrate content of bamboo shoots responsive to nitrogen fertilizer rate
浙江省自然科学基金资助项目(300209)
- Received Date: 2003-08-20
- Rev Recd Date: 2003-10-15
- Publish Date: 2004-03-20
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Key words:
- vegetables gardening /
- Phyllostachys praecox /
- bamboo shoot /
- nitrate /
- fertilizing
Abstract: Phyllostachys praecox which can produce delicious bamboo shoots have been planted in large scope .The practice of surplus fertilizing and winter mulching has been carried out in the near decade to get earlier bamboo shoots and then a high economic profit .A field investigation was undertaken to nuderstand the nitrate pollution situation of bamboo shoots in Ph .praecox cropping area , a fertilizer trial with 6 treatments [ 3 nitrogen levels : 598 , 897 , 1 196 kghm-2 (N)and different allocation of 4 kinds of fertilizer :urea , compound fertilizer , pig manure , oil-cake] was conducted to examine the effects of large amount of nitrogen fertilizing on nitrate pollution in bamboo shoots .It was found that nitrate concentration in bamboo shoots of investigated plots was on average of 745.24 358.11 mg kg-1 with a variation coefficient 48.05 % (n =70), among the 70 samples , nitrate concentration of 48 samples exceed the WHO/FAO standard .There are still 11.43 % bamboo shoots contain more nitrate than standard after the bamboo shoots being cooked .The results from the trial informed us that nitrate concentration in bamboo shoots boosted with rate of fertilizer .The mixture of chemical and organic fertilizer could significantly reduced nitrate concentration compared on the base of the same level of nitrogen .Considering the factors of both bamboo yield and nitrate pollution , the treatment with urea 487.5 kg hm-2 a-1 , compound fertilizer 750.0 kghm-2a-1 and pig manure 56.25 thm-2a-1 was an ideal rate of fertilizer .The practice of winter mulching enhanced nitrate concentration by 33.48 % compared to non-mulching plots according to the mean value of 6 treatments .[ Ch , 6 tab .14 ref .]
Citation: | JIANG Pei-kun, XU Qiu-fang. Changes in nitrate content of bamboo shoots responsive to nitrogen fertilizer rate[J]. Journal of Zhejiang A&F University, 2004, 21(1): 10-14. |