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- W2556802675 abstract "The goal of the present work was to evaluate the correlation between vegeta- tion indices and nitrogen (N) Leaf content values, and also with dry matter production in Brachiaria decumbens forage at different periods after fertilization. The treatments con- sisted of five nitrogen rates (0, 50, 100, 150 e 200 kg ha -1 ), with six replications, evalu- ate in a completely randomized design. A system composed of two digital cameras, ca- bles, framegrabber and microcomputer was used, with a metal framework of three me- ters above ground for camera positioning. The system acquired images in two spectral bands, simultaneously, in two phases. In the first phase, accomplished during the period of February to March 2006, the images were acquired at 15, 21 and 32 days after fertili- zation. In the second phase, accomplished during the period March-May 2006, the im- ages were acquired at 28, 36, 45 and 53 days after the reapplication of the same nitro- gen rates. From the original images were determined different vegetation indices, which were submitted to correlation analyses. The correlation values between vegetation indi- ces and N leaf content obtained in laboratory ranged from 0.63 to 0.83 in the first stud- ied phase and from 0.64 to 0.75 in the second phase. The correlation values between vegetation indices and values of dry matter production in the first phase ranged from 0.62 to 0.66 and those in the second study phase from 0.72 to 0.75. The correlation values between all vegetation indices and the tested variables tended to decrease with the days after fertilization. The best index was GNDVI." @default.
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- W2556802675 date "2006-01-01" @default.
- W2556802675 modified "2023-09-24" @default.
- W2556802675 title "Correlation between vegetation indices and nitrogen leaf content and dry matter production in Brachiaria decumbens" @default.
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