Study on Yield and Nitrogen Absorption and Utilization Characteristics of Different Switchgrass Varieties in Saline-alkali Land

doi:10.7668/hbnxb.20190390

Abstract

Abstract: In order to find a variety of switchgrass varieties suitable for planting in the Yinbei saline-alkali area of Ningxia, this study analyzed and compared the biomass yield and nitrogen uptake and utilization of 11 different species of switch grass varieties through field experiments. The results showed that among the 11 switchgrass varieties, the yield of Alamo was the highest, which was 20.47 t/ha, which was significantly higher than that of other varieties (P <0.05). The nitrogen uptake efficiency decreased firstly during the whole growth period. The general trend of rising and then decreasing, and the absorption efficiency of Cave-in-Rock nitrogen was higher in the flowering and filling stages, which was significantly higher than that in other varieties (P <0.05). Black Well nitrogen utilization efficiency was the highest. Up to 69.26 kg/kg, it can be known from the clustering results that it is divided into four categories. Among them, the Alamo variety of switchgrass in the second category had the highest biological yield, and the nitrogen use efficiency was second only to Black Well, which was 67.66 kg/kg. There was no significant difference between the two (P >0.05). The comprehensive analysis showed that planting Alamo variety switchgrass in this area can not only obtain higher biological yield, but also avoid a series of environmental pollution problems caused by excessive application of nitrogen fertilizer, and provide a theoretical basis for its cultivation and management in saline-alkali soil.

Key words: Saline-alkali land, Switchgrass, Nitrogen uptake and utilization, Biomass yield, Cluster analysis

CLC Number:

S153

HE Haifeng, WU Na, LIU Jili, CHANG Wenwen, ZHANG Yongqian, CAI Ming, CHEN Juan, YANG Yaya. Study on Yield and Nitrogen Absorption and Utilization Characteristics of Different Switchgrass Varieties in Saline-alkali Land[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(S1): 273-280. doi: 10.7668/hbnxb.20190390.

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