Effects of reduced nitrogen application on nitrogen uptake and utilization efficiency in maize-soybean relay strip intercropping system

SUMMARYSix intercropping systems and four levels of nitrogen were compared at the Indian Agricultural Research Institute, New Delhi, in the summer rainy seasons (July-October) of 1978 and 1979. The maximum increase in sorghum yield was obtained when it was associated with fodder cowpea, followed by association with grain cowpea and greengram. The application of 40, 80 and 120 kg N ha−1 increased sorghum yield by 8.6, 16.1 and 18.2% in 1978 and by 2.9, 8.1 and 14.1% in 1979, respectively, compared with unfertilized sorghum. The nitrogen uptake by sorghum, and by the total system, was greater in sorghum-legume intercropping systems than in sole sorghum. Nitrogen application also increased the nitrogen uptake by sorghum and by the whole system.

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Genotypic Differences and Valuation in Nitrogen Uptake and Utilization Efficiency in Rice

Chinese Journal of Plant Ecology ◽

10.17521/cjpe.2003.0067 ◽

2003 ◽

Vol 27 (4) ◽

pp. 466-471

Author(s):

JIANG Li-Geng ◽

DAI Ting-Bo ◽

WEI Shan-Qing ◽

GAN Xiu-Qin ◽

XU Jian-Yun ◽

...

Keyword(s):

Nitrogen Uptake ◽

Utilization Efficiency ◽

Genotypic Differences

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Nitrogen uptake and transfer in broad bean and garlic strip intercropping systems

Journal of Integrative Agriculture ◽

10.1016/s2095-3119(17)61772-6 ◽

2018 ◽

Vol 17 (1) ◽

pp. 220-230 ◽

Cited By ~ 5

Author(s):

Qiu-xiang TANG ◽

Haile Tewolde ◽

Hong-bin LIU ◽

Tian-zhi REN ◽

Ping-an JIANG ◽

...

Keyword(s):

Nitrogen Uptake ◽

Broad Bean ◽

Strip Intercropping

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Depression of Groundwater Table and Reduced Nitrogen Application Jointly Regulate the Bacterial Composition of nirS-Type and nirK-Type Genes in Agricultural Soil

Water ◽

10.3390/w12123459 ◽

2020 ◽

Vol 12 (12) ◽

pp. 3459

Author(s):

Fangfang Bai ◽

Xuebin Qi ◽

Ping Li ◽

Dongmei Qiao ◽

Jianming Wang ◽

...

Keyword(s):

Species Composition ◽

Nitrogen Fertilization ◽

Bacterial Communities ◽

Agricultural Soil ◽

Soil Microbial Communities ◽

Groundwater Table ◽

Nitrogen Application ◽

Bacterial Composition ◽

Reduced Nitrogen ◽

The Impact

Despite the known influence of nitrogen fertilization and groundwater conditions on soil microbial communities, the effects of their interactions on bacterial composition of denitrifier communities have been rarely quantified. Therefore, a large lysimeter experiment was conducted to examine how and to what extent groundwater table changes and reduced nitrogen application would influence the bacterial composition of nirK-type and nirS-type genes. The bacterial composition of nirK-type and nirS-type genes were compared at two levels of N input and three groundwater table levels. Our results demonstrated that depression of groundwater table, reduced nitrogen application and their interactions would lead to drastic shifts in the bacterial composition of nirS-type and nirK-type genes. Structural equation models (SEMs) indicated that depression of groundwater table and reduced nitrogen application not only directly altered the species composition of denitrifier bacterial communities, but also indirectly influenced them through regulating soil nutrient and salinity. Furthermore, the variation in soil NO3−–N and electrical conductivity caused by depression of groundwater table and reduced nitrogen application played the most important role in altering the community composition of denitrifier bacterial communities. Together, our findings provide first-hand evidence that depression of groundwater table and reduced nitrogen application jointly regulate the species composition of denitrifier bacterial communities in agricultural soil. We highlight that local environmental conditions such as groundwater table and soil attributes should be taken into account to enrich our knowledge of the impact of nitrogen fertilization on soil denitrifier bacterial communities, or even biogeochemical cycles.

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