INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY

Volume 14, No. 07, Month DECEMBER, Year 2018, Pages 2137 - 2150

Effects of interaction between nitrogen and potassium on the growth and yield of cassava

Thummanatsakun, V. and Yampracha, S.

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Nitrogen and potassium are necessary nutrients for cassava and are generally deficient in soil, particularly nitrogen. High nitrogen fertilizer applications may induce greater a potassium requirement. The results showed that increasing nitrogen rates significantly increased plant height, SPAD value of the upper and lower leaf, the fresh and dry weight of leaf blade, stem+petiole, tuber and total weight. Increasing potassium rates was decreased the SPAD value of lower leaves. Nitrogen uptake in OSC and tuber was significantly affected by interaction between N and K, but N uptake in the leaf blade and the total N uptake were affected by increasing N rates. Potassium uptake in tuber and total K uptake were significantly affected by interaction between N and K but K uptake in stem+petiole and OSC affected by increasing K rates. Furthermore, the total uptake of N and K gave a high positive correlation with the fresh and dry weight of all plant parts except OSC. The correlation coefficient between uptake N and K in the leaf blade, stem+petiole, OSC, and tuber were 0.85**, 0.83**, 0.35* and 0.87**, respectively.

Keywords

cassava, nitrogen, potassium, interaction

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