|Table of Contents|

Effects of NO3--N/NH4+-N Ratio on Enzyme Activity in Nitrogen Assimilation and Nitrogen Efficiency of Tomato Cultivated in Organic Substrate(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2017年24
Page:
7-16
Research Field:
Publishing date:

Info

Title:
Effects of NO3--N/NH4+-N Ratio on Enzyme Activity in Nitrogen Assimilation and Nitrogen Efficiency of Tomato Cultivated in Organic Substrate
Author(s):
GONG Huarui; LUO Hongyi; QI Yanyan; PANG Xiaoyan
College of Resources and Environment,Shandong Agricultural University,Tai′an,Shandong 271000
Keywords:
tomato; substrate cultivation; NO3--N; NH4+-N; N assimilation; N efficiency
PACS:
-
DOI:
10.11937/bfyy.20172008
Abstract:
In the present research,winter-crossing greenhouse tomato was taken as experimental plants by pot containing substrate,the effects of different NH4+-N/NO3--N ratios related to N assimilation and uptake,efficiency of tomato were studied.By the equivalent N supply,compared to CK(0% NH4+-N),at T1(5% NH4+-N),T2(10% NH4+-N),T3(15% NH4+-N),T4(20% NH4+-N) the NR activity and NO3--N contents of tomato plants decreased with the increased proportion of NH4+-N within total N,the GS activity of tomato increased with the increased proportion of NH4+-N in nutrient solution.The enzyme activity responsible for N assimilation was regulated effectively by moderately increased proportion of NH4+-N,and the absorption and efficiency of N by tomato plants was promoted as well.When the NH4+-N proportion raised at T4,the field and N efficiency decreased significantly,and at T3 NH4+-N proportion,the field and N efficiency were better than the other treatments.Thus,based on the experimental results,it was suggested that the NH4+-N proportion of treatment T3 would be the optimal one.

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Last Update: 2017-12-28