Arid Zone Research ›› 2024, Vol. 41 ›› Issue (1): 71-79.doi: 10.13866/j.azr.2024.01.07

• Land and Water Resources • Previous Articles     Next Articles

Effects of different nitrogen levels on the apparent soil nutrient balance and tuber yield of Cyperus esculentus farmland

CAO Ziqi1(),LU Zhanyuan1(),REN Yongfeng1,ZHAO Xiaoqing1,WANG Jianguo1,HOU Zhihui1,HAN Yunfei1,WANG Dengyun2,SHANG Xueyan2,DUAN Rui2   

  1. 1. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010018, Inner Mongolia, China
    2. Agricultural and Animal Husbandry Technology Promotion Center of Dengkou County, Bayannur 015200, Inner Mongolia, China
  • Received:2023-08-11 Revised:2023-10-10 Online:2024-01-15 Published:2024-01-24

Abstract:

This study aimed to investigate the apparent soil nitrogen balance and tuber yield of Cyperus esculentus in sandy farmland under different levels of nitrogen application and provide a theoretical basis for increasing the yield of Cyperus esculentus in sandy farmland. Four nitrogen fertilizer treatments, 0 kg·hm-2 (N0), 75 kg·hm-2 (N1), 150 kg·hm-2 (N2), and 225 kg·hm-2 (N3), were applied to Cyperus esculentus in 2021 at the experimental site in Dengkou County, Bayannur City, Inner Mongolia, and Toketo County, Inner Mongolia Academy of Agricultural Sciences, Hohhot, China. The effects of the four different N application levels on agronomic traits, tuber yield, and clear soil nutrient balance of Cyperus esculentus were analyzed. The number of tillers, plant height, and single leaf area of C. esculentus increased alongside increasing N application, but excessive N application caused above-ground growth of C. esculentus, resulting in lower yield. At the application rate of 150 kg·hm-2 (N2), Cyperus esculentus exhibited superior agronomic traits, including maximum root length and root volume, the highest whole plant dry weight and tuber yield, and a fresh tuber yield of 9298.87 kg·hm-2. The apparent nitrogen surplus rates in the two locations were negative at the levels of 0 kg·hm-2 (N0) and 75 kg·hm-2 (N1) and positive at the levels of 150 kg·hm-2 (N2) and 225 kg·hm-2 (N3). This pattern indicates that nitrogen reached a balanced state at the N2 level in both locations, signifying an optimal nitrogen application rate of 150 kg·hm-2. RDA analysis showed that tiller number, plant height, single leaf area, maximum root length, root volume, and nitrogen uptake were the main factors driving the formation of dry matter and tuber yield in C. esculentus. Therefore, in northern sandy soil conditions, the application of N at 150 kg·hm-2 can promote the absorption of nutrients by Cyperus esculentus and maintain the apparent nutrient balance of soil, which is conducive to the growth, development, and yield formation of Cyperus esculentus.

Key words: Cyperus esculentus, nitrogen application levels, agronomic traits, tuber yield, soil apparent nutrient balance