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    Effect of combination fertilizer on growth and yield of Cassava cv. Rayong9 in Thailand
    (2025-01-01)
    Srifa, T.
    ;
    Somwang, T.
    ;
    Panitnok, K.
    ;
    Yusuk, P.
    ;
    Sarutayophat, T.
    The effects of combination fertilizer applications on cassava growth, yield, and starch content (cv. Rayong 9) were investigated. Plant heights were highest in chemical fertilizer only (T3) and combined chemical fertilizer with biofertilizer (T4) treatments. Stem diameter and SPAD chlorophyll readings were significantly higher in T4 at a key growth stage. After six months of harvesting, T4 yielded the highest fresh leaves (258.75 kg ha<sup>-1</sup>) and rhizome yields (1184.75 kg ha<sup>-1</sup>). T3 produced the highest fresh root yield in eight months of 15,937.50 kg ha<sup>-1</sup>, while T4 outperformed all treatments at ten months (17,787.50 kg ha<sup>-1</sup>). However, reducing the NPK fertilizer rate to half (12.5 kg ha<sup>-1</sup>) combined with PGPR (T5) significantly enhanced cassava root yield at both the 6 and 10-month when harvested as compared to the full NPK fertilizer rate (T3, 437.5 kg ha<sup>-1</sup>) only. Moreover, T5 showed the highest starch content at six months of growth (27.14%) and harvesting at ten months (19.67%). These findings indicated that integrating biofertilizers with reduced chemical fertilizer applications is a promising approach for promoting sustainable cassava production.
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    Genetic characterization of cassava (Manihot esculenta Crantz) cultivars using ISSR molecular marker
    (2024-05-01)
    Poeaim, S.
    ;
    Sansanee, S.
    ;
    Chantaraprasit, T.
    ;
    Chareonsap, P. P.
    ;
    Tangthirasunun, N.
    The genetic diversity of 22 cassava varieties using the inter-simple sequence repeat (ISSR) molecular marker was investigated. Genetic similarity was derived from the matrix of simple similarity coefficients using the unweighted pair group method with arithmetic average (UPGMA). The genetic similarity coefficient ranged from 0.73 to 0.94. The similarity coefficient at 0.73, cluster analysis was clustered to be 22 cassava varieties into two significant groups. The first group was the sweet variety of cassava used for consumption, consisting of Rayong2, Hana-tee and variegated leaves used for decoration. Another group, the bitter variety of cassava used for industry, consisted of Rayong1, Rayong3, Rayong5, Rayong7, Rayong9, Rayong11, Rayong15, Rayong60, Rayong72, Rayong86-13, Rayong90, Kasetsart50, Kasetsart72, Huay Bong60, Huay Bong80, Huay Bong90, Pirun1, Pirun2 and unknown. The sweet and bitter variety contained different levels of cyanide content. So, the ISSR marker might be able characterize two major cassava varieties.
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    Effects of interaction between nitrogen and potassium on the growth and yield of cassava
    (2018-12-01)
    Thummanatsakun, V.
    ;
    Yampracha, S.
    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.
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    Investigation of tannin crude extract from cassava leaves for mealy bug control
    (2013-12-01)
    Arirob, Wallop
    ;
    Insung, Ammorn
    ;
    Pumnuan, Jarongsak
    ;
    Won-In, Krit
    ;
    Dararutana, Pisutti
    Different concentrations of tannin crude extract from cassava leaves were used for direct spraying, dipping, choice and no-choice repellent test for controlling cassava mealy bug (Pseudococcus jackbeardsleyi Gimpel and Miller). By direct spray method, it was showed that tannin crude extract could not kill cassava mealy bug as insecticide but remarkably repelled mealy bug. Dipping method at 1,500 mg/l tannin concentration could only kill the mealy bug of 7.4% and seemed to decrease plant damage of 32.52% when compared with control. Field experiment revealed that spraying with 1,000 mg/l tannin extract concentration could keep cassava clean, less damaging of mealy bug as well as cassava could promote new apical bud, axially growth and straight trunk. It was wondering that extract from cassava leaves could be used as cassava mealy bug repellant. © 2013 American Scientific Publishers.