Estimating the effect of urease inhibitor on rice yield based on NDVI at key growth stages

doi:10.15302/J-FASE-2014028

Front. Agr. Sci. Eng.

2014, Vol. 1

Issue (2) : 150-157 https://doi.org/10.15302/J-FASE-2014028

RESEARCH ARTICLE

Estimating the effect of urease inhibitor on rice yield based on NDVI at key growth stages

Kailou LIU,Yazhen LI(

),Huiwen HU

National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Institute of Red Soil, Jinxian 331717, China

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Abstract

The effect of the urease inhibitor, N-(n-butyl) thiophosphoric triamide (NBPT) at a range of application rates on rice production was examined in a field experiment at Jinxian County, Jiangxi Province, China. The normalized difference vegetation index (NDVI) was measured at key growth stages in both early and late rice. The results showed that the grain yield increased significantly when urea was applied with NBPT, with the highest yield observed at 1.00% NBPT (wt/wt). NDVI differed with the growth stage of rice; it remained steady from the heading to the filling stage. Rice yield could be predicted from the NDVI taken at key rice growing stages, with R² ranging from 0.34 to 0.69 in early rice and 0.49 to 0.70 in late rice. The validation test showed that RMSE (t·hm^-2) values were 0.77 and 0.87 in early and late rice, respectively. Therefore, it was feasible to estimate rice yield for different amounts of urease inhibitor using NDVI.

Keywords normalized difference vegetation index (NDVI) N-(n-butyl) thiophosphoric triamide (NBPT) rice grain yield

Corresponding Author(s): Yazhen LI

Just Accepted Date: 15 July 2014 Online First Date: 11 August 2014 Issue Date: 10 October 2014

Cite this article:

Kailou LIU,Yazhen LI,Huiwen HU. Estimating the effect of urease inhibitor on rice yield based on NDVI at key growth stages[J]. Front. Agr. Sci. Eng. , 2014, 1(2): 150-157.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2014028
https://academic.hep.com.cn/fase/EN/Y2014/V1/I2/150

Fig.1 Grain yield of rice over a range of concentrations of the urease inhibitor NBPT in conjunction with urea application. Data with different letters for both early and late rice differ significantly among all treatments at P<0.05 (with LSD test). Control was no NBPT or urea; 0.00% NBPT, 0.50% NBPT, 0.75% NBPT, 1.00% NBPT, 1.25% NBPT and 1.50% NBPT indicates that NBPT was applied at a rate of 0.00%, 0.50%, 0.75%, 1.00%, 1.25% and 1.50% on a urea basis (135 kg N·hm^-²).

Tab.1 Yield components of rice treated with different concentrations of the urease inhibitor NBPT in conjunction with urea application

Tab.2 The exponential regression of NDVI at key growth stages against grain yield of rice

Fig.2 The trend in NDVI at key growth stages of rice over a range of concentrations of the urease inhibitor NBPT in conjunction with urea application. The meaning of abbreviations for each treatment is indicated in the text: Control was no NBPT or urea; 0.00%NBPT, 0.50%NBPT, 0.75%NBPT, 1.00%NBPT, 1.25%NBPT and 1.50%NBPT indicate that NBPT was applied at rate of 0.00%, 0.50%, 0.75%, 1.00%, 1.25% and 1.50% on a urea basis (135 kg N·hm^-²).

Tab.3 Analysis of the differences between grain yield in rice predicted from NDVI and actual yield in the validation experiment

Fig.3 The relationship between NDVI and grain yield of early rice at key growth stages

Fig.4 The relationship between NDVI and grain yield of late rice at key growth stages

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