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

Huiwen Hu,Kailou Liu,Yazhen Li

doi:10.15302/j-fase-2014028

Huiwen Hu, Kailou Liu + Show 1 more

Open Access

https://doi.org/10.15302/j-fase-2014028

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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 afield 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 R 2 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,

Highlights

Nitrogen fertilizer is an essential input on most farms during crop production
The application of urea increased the grain yield significantly under all NBPT application rates for both early and late rice compared with the control (Fig. 1)
NBPT application had no effect on plant height, panicle number, panicle length, spikelets/panicle, proportion of filled grain and 1000-grain weight

Summary

Introduction

Nitrogen fertilizer is an essential input on most farms during crop production. Urea is the most widely used N fertilizer in the world because of its solubility, high N concentration and ease of handling, and accounts for over 50% of all N applied [1]. It is more susceptible to loss as ammonia gas when left on the soil surface. After applying urea to soil, it is rapidly hydrolyzed by urease enzymes to form ammonia. The excess emission of ammonia results in a significant economic loss for farmers and has a negative effect on air quality, crop productivity, and human health [1,2]. N-(n-butyl) thiophosphoric triamide (NBPT) is a urease

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