Potassium (K) fertilisation at planting time may not be sufficient to achieve high cassava yields. Experiments were conducted over two growing periods using sweet cassava (SC) variety IAC 576-70 and bitter cassava (BC) variety IAC 13 aiming to evaluate the effects of K fertilisation rate (0–150 kg K/ha) and timing of application (one, two, or three) on leaf K concentration, yield components, and storage-root and starch yields. The SC and BC varieties were grown in a randomized block design in a 3 × 4 + 1 factorial scheme with four replications during growing periods of 10 and 20 months respectively. For SC, split application of K at planting plus 3 months after planting (MP) or at planting plus 1.5 and 3 MP was more effective at increasing the marketable root yield, with greater rainfall at the beginning of the growing period. Split application of K at planting plus 3 MP also reduced the cooking time and cooked root firmness. For BC, split application of K at planting plus 12 MP more effectively increased the storage-root and starch yields; however, root yield response to K fertilisation in the second growing period, with greater rain intensity during the initial crop stages, was greater than in the first growing period. In K-deficient soils, the optimal K application rate for SC marketable root yield varied from 79 to 111 kg/ha when K was applied after 1.5 MP, and linear responses to K application rate occurred when K was applied earlier. For BC, the optimal K application rate varied from 75 to 92 kg K/ha. Our data suggest that K application times should be different for cassava varieties with short and long growing periods.
Retenção da água em Latossolo cultivado sob plantio direto por longo período / Gabriela Hellmeister. --Piracicaba, 2020. p.Dissertação (Mestrado) --USP / Escola Superior de Agricultura "Luiz de Queiroz". 1. Curva de retenção 2. Distribuição de poros 3. Manejo do solo I. Título (Xicória), Larissa (Fetixe), e ainda aos meus amigos de Bauru, Thais Michelão, Victor Solci e Marcos Scarpim, enfim, todos que tive a felicidade dos encontros e dos reencontros ao longo desses dois anos, afinal, esses momentos são tão importantes quanto os de estudo.Agradeço ao meu namorado Xavier Le Gallic por todo apoio, companheirismo e cumplicidade, e mesmo com a distância, sempre se fez presente através de seu carinho e dedicação.Agradeço também a todos os professores e pesquisadores com os quais tive a satisfação de trabalhar anteriormente e que me influenciaram a escolher a área acadêmica, pelo incentivo à pesquisa e desenvolvimento de projetos anteriores, aos professores da UNESP Botucatu: Kléber Lanças, professor Paulinho Arbex, Ciro Rosolém, e ao professor e pesquisador da EMBRAPA instrumentação Silvio Crestana.Agradeço, finalmente, ao CNPq pela bolsa concedida para a realização deste projeto.
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