摘要
通过田间试验,研究沼液浇灌量对茭白植株不同生育期氮、磷、钾养分吸收累积以及利用效率的影响。结果表明,当沼液浇灌量为2.0倍(2.0N)和2.7倍(2.7N)对照化肥氮时,茭白植株成熟期磷和钾累积量均受到明显抑制,其中,磷积累量分别下降8.73%和42.0%,钾积累量分别下降16.4%和34.1%;氮累积量仅在2.7N处理时受到明显抑制。2.0N和2.7N处理使茭白植株不同生育期茎秆和叶片氮磷含量整体呈增加趋势,其中2.7N时尤为明显,然而钾含量反而下降。茭白氮含量随沼液浇灌量增加而增加,钾含量呈先增后降趋势,磷含量变化较为稳定。沼液浇灌处理均抑制了茎秆磷转运,但却促进了茎秆和叶片钾转运。另外,2.0N和2.7N处理明显抑制了叶片氮转运。因此,沼液浇灌能够影响茭白植株对氮、磷、钾养分的吸收累积特性,改变利用效率。适量浇灌有利于提高茭白养分利用效率。
A filed experiment was conducted to study the effect of biogas slurry application on N,P and K accumulation at different growth stages and utilization rate of Zizania latifolia. It was shown that P and K accumulation at maturity stage were suppressed obviously under treatments of 2. 0N and 2. 7N,in which the application rate of biogas slurry were 2. 0 and 2. 7 times the application rate of chemical nitrogen in control（ CK） treatment. Compared to CK,P and K accumulation was decreased by 8. 73% and 42. 0%,and 16. 4% and 34. 1%,respectively,under these two treatments. N accumulation at maturity stage was decreased significantly only under 2. 7N treatment. N and P concentrations in stems and leaves of Zizania latifolia during whole growth stage showed a rising trend generally under2. 0N and 2. 7N treatments,especially for 2. 7N,which were contrary to K. N concentrations in edible parts of Zizania latifolia were increased with the increase of biogas slurry application rates. K concentrations were increased firstly and then decreased. However,P concentrations kept relatively stable. Biogas slurry application could restrain P translocation in stems,but promote K translocation in both stems and leaves. In addition,2. 0N and 2. 7N treatments significantly reduced N translocation in leaves. In conclusion,biogas slurry application could affect N,P and K uptake and accumulation in Zizania latifolia and alter nutrient utilization efficiency. Reasonable application rate shall be beneficial to increase nutrient utilization efficiency.
出处
《浙江农业学报》
CSCD
北大核心
2016年第3期474-481,共8页
Acta Agriculturae Zhejiangensis
基金
嘉兴市科技计划项目(2014AZ21005)
嘉兴市科技局重点项目(市2011AZ1018)
关键词
茭白
沼液
氮
磷
钾
Zizania latifolia
biogas slurry
N
P
K
