Índice espectrais de vegetação no monitoramento de parâmetros fisiológicos do milho(Zea Mays L.) submetidos à bioestimulantes e sua correlação com a produtividade

Abstract

Corn is a crop of great national interest, being one of the main grains in Brazil. In order to obtain even greater yields in the corn crop, several works are carried out, year after year, in order to increase productivity and product quality. In this sense, in recent decades, research has deepened the use of biostimulants, which promise to bring agronomic yields to the crop, both in quality and in productivity. Furthermore, advances in monitoring and characterizing vast areas of corn planting are in constant development, with the use of Vant's using cameras that allow remote assessment of the state of the crop in the field. This work aimed to analyze the interaction of vegetation indices with corn crop subjected to biostimulants. The experiment was carried out in the city of Areia-PB, the corn hybrid used was AG1051. The biostimulants were the pyroligneous extract, algae extract (A. nodosum), and the stimulate®, applied in three different doses, in three stages of the culture: seed, V3, V8, resulting in a 3x4x3+1 factorial (control). The images obtained were taken using a DJI drone with an attached RGB camera, which were later processed, the plant indices (NGRDI, SAVI, TGI, EXG) were calculated and extracted. The results obtained were that there was a significant difference between the indices and days after planting, as well as between the indices and treatments. The indices were able to identify the treatments. The best treatment in terms of total chlorophyll content was the 8g/L of the pyroligneous extract and the 4 g/L dose of Kinetin; Gibberellic Acid; indole butyric acid applied to the seed. The best productivity was related to the Kinetin; Gibberellic Acid; indole butyric acid treatment at a dose of 6 g/L applied in the V8 phase of the plant. There was a correlation between the NGRDI and SAVI index and the total chlorophyll content. There was a correlation, however low, between the indexes and productivity.