Efeito de doses crescentes de nitrogênio, fósforo e potássio sôbre a produção de mandioca em solos de baixa e alta fertilidade

Silva, Jairo Ribeiro da; Freire, E. S.

doi:10.1590/s0006-87051968000200011

Cited by 5 publications

References 5 publications

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Leaf area development and yield of cassava in response to pruning of shoots and the late supply of nitrogen and potassium

et al. 2020

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This study evaluated leaf area development, leaf nutritional content, and yield of pruned/unpruned cassava supplied with nitrogen (N) and potassium (K) during its second vegetative cycle. Two field experiments were conducted in a randomized complete-block design with split-plots and four replications. The treatments consisted of four management approaches that combined pruning/not pruning with or without K as the main plot and four N application rates (0, 50, 100, and 200 kg ha −1 N) as the subplots. The results revealed that an evaluation of the nutritional status of cassava during its second vegetative cycle should be considered if shoot pruning has been conducted because pruned plants had higher concentrations of N, P, and K in their leaves, and unpruned plants exhibited leaves with higher Ca, Fe, and Mn concentrations. Pruning of cassava shoots during the autumn/winter resting phase did not negatively affect root yield and may represent a recommended management practice for cassava cultivation. In soils with a medium level of K availability, K provision during the second cassava growth cycle is unnecessary because the application of K did not increase leaf reconstitution or yield components in either pruned or unpruned plants. The late application of N improved the nutritional status of cassava plants and increased their leaf area during the second growth cycle. Cassava root, starch, and flour yields increased in a linear fashion in response to the late application of N.

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Leaf area development and yield of cassava in response to pruning of shoots and the late supply of nitrogen and potassium

et al. 2020

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P nutrition of cassava, including mycorrhizal effects on P, K, S, Zn and Ca uptake

Zaag

Fox

Peña

et al. 1979

Field Crops Research

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Potassium management effects on yield and quality of cassava varieties in tropical sandy soils

Gazola

Fernandes

Hellmeister

et al. 2022

Crop & Pasture Science

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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.

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Efeito de doses crescentes de nitrogênio, fósforo e potássio sôbre a produção de mandioca em solos de baixa e alta fertilidade

Cited by 5 publications

References 5 publications

Leaf area development and yield of cassava in response to pruning of shoots and the late supply of nitrogen and potassium

Leaf area development and yield of cassava in response to pruning of shoots and the late supply of nitrogen and potassium

P nutrition of cassava, including mycorrhizal effects on P, K, S, Zn and Ca uptake

Potassium management effects on yield and quality of cassava varieties in tropical sandy soils

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