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Acta Agronomica Sinica ›› 2020, Vol. 46 ›› Issue (6): 950-959.doi: 10.3724/SP.J.1006.2020.94121

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

Effect of variety and growth period on NDVI estimation of nitrogen concentration in potato plants

YANG Hai-Bo,ZHANG Jia-Kang,YANG Liu,JIA Yu-Ze, ,LI Fei()   

  1. Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource / College of Grassland, Resources and Environment, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
  • Received:2019-08-17 Accepted:2019-12-26 Online:2020-06-12 Published:2020-01-14
  • Contact: Fei LI E-mail:feili72@163.com
  • Supported by:
    “Youth Science and Technology Talents Support Program” (NJYT-18-A08) of Colleges and Universities of Inner Mongolia Autonomous Region in 2018(NJYT-18-A08);National Natural Science Foundation of China(41361079)

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Abstract:

The normalized difference vegetation index (NDVI) is an important parameter to reflect relative chlorophyll content and nitrogen level of crops, but NDVI’s ability to estimate nitrogen nutrition is affected by varieties and growth period. The field experiments using several varieties were conducted in the main potato producing areas at the north foot of Yinshan mountain, Inner Mongolia. From early July to mid-august in 2014 to 2016, the canopy spectral index NDVI was measured by using the pocket active crop sensor GreenSeeker during potato critical growth period. The effects of cultivars and growth stages on NDVI estimation of nitrogen concentration in potato plants were compared. The linear correlation between NDVI and plant nitrogen concentration (PNC) was poor in tuber initiation, but increased in process of growth period. The combination of tuber bulking period and starch accumulation period significantly improved the linear modeling effect of NDVI and PNC. Variety combination reduced the sensitivity of NDVI and increased the discreteness of data, which could be offset by NDVI time series normalization (TNDVI), especially the fitting coefficient of determination (R 2) of TNDVI and PNC increased from 0.13 to 0.47 in the tuber bulking period. The R 2of linear estimation model of TNDVI for the combination of tuber initiation, tuber bulking and starch accumulation period was 0.76, which was significantly higher than that of NDVI. Plant-expanded varieties had a more linear fitting trend during tuber bulking and starch accumulation. The growth period and potato varieties had significant effects on NDVI estimation of PNC, and growth period had a greater effect. The established TNDVI spectral index overcame the data differentiation and saturation phenomenon during tuber bulking and starch accumulation caused by variety difference, which provides a theoretical basis and method for the application of NDVI in the diagnosis of nitrogen concentration in potato plants.

Key words: potato, varieties, growth stage, active crop sensor, NDVI, PNC

Fig. 1

Location of test site and distribution of test plot T1-T7 represents the treatment of nitrogen fertilizer from low to high; a, b, c, and d are four replicated. "

Table 1

Correlation between NDVI and nitrogen concentration in potato plants (R2) "

时间
Year		 品种
Species		 函数类型
Function types		 块茎形成期
Tuber
initiation (A)		 块茎膨大期
Tuber
bulking (B)		 淀粉积累期
Starch
accumulation (C)		 A+B B+C A+B+C
2014 克新1号
Kexin 1		 线性函数 LF 0.04 0.83** 0.44** 0.38** 0.52** 0.52**
二次函数 QF 0.09 0.87** 0.44** 0.48** 0.52** 0.59**
幂函数 PF 0.04 0.85** 0.44** 0.45** 0.52** 0.55**
指数函数 EF 0.04 0.83** 0.44** 0.38** 0.52** 0.52**
2015 夏坡蒂Xiapodi 线性函数 LF 0.04 0.37** 0.36** 0.04 0.85** 0.52**
二次函数 QF 0.05 0.48** 0.40** 0.10 0.85** 0.67**
幂函数 PF 0.04 0.41** 0.35** 0.03 0.83** 0.58**
指数函数 EF 0.04 0.38** 0.35** 0.04 0.85** 0.53**
2016 荷兰14号
Holland 14		 线性函数 LF 0.07 0.44** 0.52** 0.01 0.72** 0.52**
二次函数 QF 0.08 0.56** 0.64** 0.15 0.76** 0.74**
幂函数 PF 0.07 0.45** 0.55** 0.01 0.74** 0.58**
指数函数 EF 0.08 0.44** 0.52** 0.01 0.72** 0.52**
全部All 线性函数 LF 0.03 0.07* 0.50** 0 0.48** 0.28**
二次函数 QF 0.06 0.13* 0.57** 0 0.58** 0.42**
幂函数 PF 0.03 0.08* 0.52** 0 0.50** 0.32**
指数函数 EF 0.03 0.07* 0.49** 0 0.48** 0.28**

Fig. 2

Estimation model of NDVI and plant nitrogen concentration during potato tuber initiation stage, tuber bulking stage and starch accumulation stage"

Fig. 3

Estimation model of NDVI and plant nitrogen concentration during combined growth stages of potato A, B, and C represent potato tuber initiation stage, tuber bulking stage and starch accumulation stage respectively. "

Fig. 4

Estimation model of NDVI and plant nitrogen concentration under potato variety combination A, B, and C represent potato tuber initiation stage, tuber bulking stage and starch accumulation stage respectively. "

Fig. 5

Estimation model of TNDVI and plant nitrogen concentration under potato variety combination during tuber bulking stage and starch accumulation stage"

Fig. 6

Estimation model of TNDVI and plant nitrogen concentration under potato variety combination during combined growth stage"

Fig. 7

Noise equivalent of pant nitrogen concentration estimation by NDVI and TNDVI A, B, and C represent potato tuber initiation stage, tuber bulking stage and starch accumulation stage, respectively. "

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