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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (6): 1070-1076.doi: 10.19802/j.issn.1007-9084.2020270

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Effect of density and nitrogen fertilizer on SPAD, plant and pod yield characteristics under single seed planting in peanut

Kang CHEN()   

  1. Yantai Agricultural Technology Extension Center, Yantai 264001, China
  • Received:2020-09-11 Online:2021-12-22 Published:2021-12-23

Abstract:

Suitable density and nitrogen fertilizer were studied for efficient peanut physiological characteristics, plant and pod yield characteristic under single seed planting. The field experiment was conducted in the Zhaoyuan, Yantai City, Shandong Province. The field experiment was carried out in the year 2018 and 2019, with a export big-pod variety of peanut Huayu22 as tested material. Three plant densities of 120 000, 200 000 and 280 000 plant/hm2(named as D1, D2 and D3), and four nitrogen application rates of 0, 50, 115 and 180 kg/hm2 were designed (named as N0, N50, N115, N180, respectively).The SPAD, plant and pod yield characteristic of peanut were investigated in different bear periods. Both the plant density and nitrogen application rate had significant effected SPAD value, dry matter quality, plant and pod yield characteristic of peanut, and the interaction between them was significant as well. Compared to low plant density (120 000 plant/hm2) and high plant density (280 000 plant/hm2), the pod yields under plant density of 200 000 plant/hm2 were significantly increased by 24.31%-45.04% and 10.57%-15.13%, respectively. The SPAD value of maturation period were significantly increased by 3.70%-27.82% and 6.10%-18.94%, dry matter quality of maturation period were significantly increased by 7.31%-32.34% and 10.65%-34.59%. Under the plant density of 200 000 plant/hm2,when the nitrogen application rate was increased from 50 to 180 kg/hm2, the pod yield, SPAD value and dry matter quality of peanut were significantly increased and all were significantly higher than that of the N0 treatment, and were in order of N115 > N180> N50>N0, and the pod yield reached the highest in N 115, which was 6.83% and 3.90% higher than those in N50 and N180 treatments. Synergistic improvement of the SPAD value, dry matter quality, plant characteristic were caused. Under this experimental field condition, comprehensively considering the physiological characteristics and pod yield characteristic, the characteristics were increased with the nitrogen application rates in the plant density of 120 000 plant/hm2, the appropriate plant density of single seed planting in peanut is 200 000 plant/hm2 and the nitrogen application rate is 115 kg/hm2.

Key words: spring peanut, density, nitrogen fertilizer, single seed planting, SPAD, plant characteristic, pod yield characteristic

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