Yampracha, Sukunya

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Preferred name
Yampracha, Sukunya
Alternative Name
Yampracha, S.
Main Affiliation
Email
sukunya.ya@kmitl.ac.th

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    Item type:Publication,
    Effects of organic fertilizer application on the transformation of nitrogen in paddy soil
    (2018-12-01)
    Supsuan, P.
    ;
    Surin, P.
    ;
    Yampracha, S.
    The effect of different types of organic fertilizer on the availability of nitrogen in paddy soil was determined. The soil samples were collected from an organic rice field in Nongchok District, Bangkok. The results showed that the soil pH of all treatments increased from 5.3 to 6.9 and 7.2. The cumulative N mineralization of sunn hemp was the highest (121.33 mg N/kg), but no significant difference was compared to for other organic fertilizers. The change of AHN was increased at the start of incubation and decreased after 70 days of incubation. It indicated that the AHN changed to ammonium. The potential N mineralization of control, cow manure, compost and sunn hemp were 95.34, 109.90, 107.23 and 114.53 mg N/kg, respectively. The K values indicated the mineralization rate of control, cow manure, compost and sunn hemp which were 0.2095, 0.2075, 0.2053 and 0.1992 mg N/kg, respectively.
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    Item type:Publication,
    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.