Modelling corn production in China using AVHRR-based vegetation health indices
Authors: Kogan, Felix; Yang, Bangjie; Wei, Guo; Zhiyuan, Pei; Xianfeng, Jiao
Source: International Journal of Remote Sensing, Volume 26, Number 11, 2005 , pp. 2325-2336(12)
Publisher: Taylor and Francis Ltd
Abstract:Weather-related crop losses have always been a concern for farmers, governments, traders and policy makers for the purpose of balanced food supplies, demands, trade, and distribution of aid to nations in need. Therefore, early crop loss assessment in response to weather fluctuations is an important issue. This paper discusses the utility of Advanced Very High Resolution Radiometer (AVHRR)-based vegetation health indices as a proxy for modelling corn yield and for early warning of drought-related losses of agricultural production in China. The indices were tested in Jilin province on corn yield during 19822001 using correlation and regression analysis. A strong correlation between corn yield and the vegetation health indices were found during the critical period of corn growth, which starts 23 weeks before and 23 weeks after corn tassel. Following the results of correlation analysis, several regression equations were constructed where vegetation health indices were used as independent variables. The estimates of corn yield can be carried out well in advance of harvest and the errors of the estimates are 710%. The errors become smaller when the estimations are related to losses in corn yield due to drought.
Document Type: Research article
Publication date: 2005-06-01