论文信息 - A hand-held red-infrared radiometer for measuring radiation interception by crop canopies

A hand-held red-infrared radiometer for measuring radiation interception by crop canopies

A simple and portable two-band radiometer to measure simultaneously, reflectance of red (r) and near infrared (ir) radiation from canopies of peanut (Arachis hypogaea L.) is described. A strong linear relationship (r2 = 0.94) was observed between the normalised reflectance ratio (NR) calculated from r and ir reflected, and the fraction of incident photosynthetically active radiation (PAR) intercepted by peanut canopies up to a leaf area index of 3.0. The importance of and scope for measurements on radiation interception in crop improvement programs is discussed.

[1] Jonathan H. Williams,et al. The Physiological Basis for Yield Differences between Four Genotypes of Groundnut (Arachis Hypogaea) in Response to Drought. I. Dry Matter Production and Water Use , 1988, Experimental Agriculture.

[2] F. Hall,et al. Global Crop Forecasting , 1980, Science.

[3] C J Tucker,et al. A three-band hand-held radiometer for field use. , 1981, Science.

[4] Marvin E. Bauer,et al. Spectral estimates of solar radiation intercepted by corn canopies. , 1983 .

[5] C. Wiegand,et al. Use of spectral vegetation indices to infer leaf area, evapotranspiration and yield. I. Rationale. , 1990 .

[6] A. Jensen. SEASONAL CHANGES IN NEAR INFRARED REFLECTANCE RATIO AND SANDING CROP BIOMASS IN A SALT MARSH COMMUNITY DOMINATED BY HALIMIONE PORTULACOIDES (L.) AELLEN , 1980 .

[7] G. Asrar,et al. Estimating Absorbed Photosynthetic Radiation and Leaf Area Index from Spectral Reflectance in Wheat1 , 1984 .

[8] M. Steven,et al. Estimation of sugar beet productivity from reflection in the red and infrared spectral bands , 1983 .

[9] M. Burns,et al. An inexpensive and simple spectrophotometer for measuring grass biomass in the field , 1984 .

[10] J. Monteith. Climate and the efficiency of crop production in Britain , 1977 .