Boron leaf application at different growth stages of peanutBoron leaf application to the peanut crop can be a viable strategy for supplying this element to the plant, however, knowledge os lacking on rate, time and dose split. The aim of this study was to evaluate the production and the leaf mineral composition at different rates, application times and split of boron fertilization. The experiment was conducted in the summer harvest 2010/2011 in an Oxisol in Rubiácea (SP). Leaf applications of boron rates of 0, 0.5, 1.0, 1.5 and 2.0 kg ha -1 were tested using boric acid as source. The effects of boron fertilization were tested in single doses at the V1 and R5 growth stages, in addition to splitting the rate of 1 kg ha -1 (0.5 kg ha -1 at V1 and R5), 1.5 (0.75 kg ha -1 at V1 and R5; 0.5 kg ha -1 at V1, R1 and R5) and 2.0 kg ha -1 (1.0 kg ha -1 at V1 and R5; 0.5 kg ha -1 at V1, R1, R3 and R5). The increase in peanut yield occured only at the rate of 1.5 kg ha -1 split in three applications of 0.5 kg ha -1 at V1, R1 and R5. The leaf application of 2.0 kg ha -1 of B to peanut cause a depressing effect on yield and number of pods per plant. A adubação boratada foliar, na cultura do amendoim, pode ser uma estratégia viável para fornecimento desse elemento à planta; porém, são poucos os conhecimentos sobre dosagens, épocas e efeitos de parcelamento das doses. O objetivo deste trabalho foi avaliar as características de produção e a composição mineral foliar em diferentes doses, épocas de aplicação e parcelamentos da adubação boratada. O experimento foi conduzido na safra de verão 2010/2011, em Latossolo Vermelho distroférrico, em Rubiácea (SP). Foram estudadas as doses de zero; 0,5; 1,0; 1,5 e 2,0 kg ha -1 de boro (B), aplicadas por via foliar, utilizando-se como fonte o ácido bórico. Os efeitos da adubação boratada foram testados em doses únicas nos estádios V1 ou R5, além do parcelamento da dose de 1,0 kg ha -1 (0,5 kg ha -1 em V1 e R5), de 1,5 (0,75 kg ha -1 em V1 e R5; 0,5 kg ha -1 em V1, R1 e R5) e de 2,0 kg ha -1 (1,0 kg ha -1 em V1 e R5; 0,5 kg ha -1 em V1, R1, R3 e R5). O aumento na produtividade de amendoim em casca ocorreu apenas com a dose de 1,5 kg ha -1 , parcelada em três aplicações de 0,5 kg ha -1 em V1, R1 e R5. A utilização de 2,0 kg ha -1 de B foliar no amendoim causou efeito depressivo na produtividade, rendimento e número de vagens por planta. Palavras-chave:Arachis hypogaea, ácido bórico, adubação foliar.
The present work aims to relate the positive effects of irrigation and mineral nutrition on coffee productivity, considering that the various existing methods and techniques involve a wide variation of dosage and nutrient splitting, due to the interaction between soil, water, climate, plant and area where the crop is located. Thus, through the methodology of literature review, a survey of research and theoretical notes of issues related to the benefits of irrigation and mineral nutrition was carried out, culminating in the focus of the fertigation technique. The study took into account aspects related to the rational use of water, the prevention of soil desertification and the Sustainable Development Goals of the UN 2030 Agenda. The analysis of the works and authors consulted made it possible to bring to the academic-scientific scope approaches that highlighted the fundamental role of fertigation in coffee farming.
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