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Acta Agronomica Sinica ›› 2018, Vol. 44 ›› Issue (12): 1858-1866.doi: 10.3724/SP.J.1006.2018.01858

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Split Application of Nitrogen Fertilizer on Yield, Quality and Nitrogen Use Efficiency of Sweet Potato

Jian-Gang AN,Fu JING,Yi DING,Yi XIAO,Hao-Hao SHANG,Hong-Li LI,Xiao-Lu YANG,Dao-Bin TANG,Ji-Chun WANG()   

  1. College of Agronomy and Biotechnology, Southwest University, Chongqing 400716, China
  • Received:2018-03-04 Accepted:2018-07-20 Online:2018-12-12 Published:2018-07-20
  • Contact: Ji-Chun WANG E-mail:wchun1963@163.com
  • Supported by:
    This study was supported by the “13th Five-Year” Potato Theme Project of Chongqing(CSTC2015shms-ztzx80002);This study was supported by the “13th Five-Year” Potato Theme Project of Chongqing(CSTC2015shms-ztzx80003);This study was supported by the “13th Five-Year” Potato Theme Project of Chongqing(CSTC2015shms-ztzx80004)

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Abstract:

To explore the optimal split nitrogen fertilizer application methods for high yield and quality sweet potato production in intercropping, we conducted a field experiment using two sweet potato cultivars Yuzi 7 and Wanshu 10 with single N application, 2-split and 3-split N application, and measured the yield, quality, and nitrogen use efficiency in monocropping and interplanting in 2015-2016. The yield, single storage root weight, soluble protein content, soluble sugar content of storage root, apparent nitrogen use efficiency and partial nitrogen productivity were significantly increased in the two tested cultivars under 2-split and 3-split N application in monocropping and interplanting. Under interplanting, commodity rate was not significantly different in the two cultivars among the three N application treatments, however, the highest commodity rate was obtained under 3-split N application in monocropping. The highest content of β-carotene in the storage root was obtained when 3-split N application was used in Wanshu 10, and the highest content of anthocyanin in the storage root was obtained when 2-split N application was used in Yuzi 7, but the highest starch content of storage root was obtained when non-split N application was used in the two cultivars. All of the quality traits except soluble protein content of storage root, and yield and nitrogen use efficiency reduced in intercropping, but these traits were equal or better in 2 or 3-split N application when compared to those in monocropping. In conclusion, non-split N application could be used to increase the starch content of storage root, and 2 or 3-split N application could be used to increase other quality traits, yield and nitrogen efficiency of sweet potato.

Key words: sweet potato-maize interplanting, split application of nitrogen fertilizer, yield, quality, nitrogen use efficiency

Table 1

Chemical composition of the soil before transplanting in two years"

年份
Year		 有机质
Organic matter
(g kg-1)		 全N
Total N
(g kg-1)		 碱解氮
Available nitrogen
(mg kg-1)		 有效磷
Available phosphorus
(mg kg-1)		 速效钾
Available potassium
(mg kg-1)
2015 11.356 0.427 54.17 54.84 204.83
2016 10.442 0.546 81.99 19.24 175.60

Table 1

Yield trait and nitrogen use efficiency of sweet potato"

Fig. 1

β-carotene content of Wanshu 10 A: sweet potato monocropping; B: sweet potato-maize interplanting; NOA: single N application, NSA: 2-split N application, NTA: 3-split N application N. Bars superscripted by different letters are significantly different between treatments at the 0.05 probability leave."

Fig. 2

Anthocyanin content of Yuzi 7 Bars superscripted by different letters are significantly different between treatments at the 0.05 probability leave. Abbreviations are the same as those given in Fig. 1."

Fig. 3

Soluble protein content of sweet potato storage root Bars superscripted by different letters are significantly different between treatments at the 0.05 probability leave. Abbreviations are the same as those given in Fig. 1."

Fig. 4

Starch content of sweet potato storage root Bars superscripted by different letters are significantly different between treatments at the 0.05 probability leave. Abbreviations are the same as those given in Fig. 1."

Fig. 5

Soluble sugar content of sweet potato storage root Bars superscripted by different letters are significantly different between treatments at the 0.05 probability leave. Abbreviations are the same as those given in Fig. 1."

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