Yampracha, Sukunya

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Yampracha, Sukunya
Alternative Name
Yampracha, S.
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Email
sukunya.ya@kmitl.ac.th

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    Effects of different organic fertilizers on residual nutrients, rice growth and yield
    (2020-01-01)
    Surin, P.
    ;
    Chomngam, K.
    ;
    Yampracha, S.
    Different organic fertilizers has affteted on the residual nutrients for rice growth and yield in the next cropping. Effects of different organic fertilizers on residual nutrients, rice growth and yield were studied. Results indicated that application of cow manure in the previous crop resulted in significant difference in exchangeable potassium (K). Other essential nutrients in soil after application of cow manure and compost residue were at high levels and sufficient for rice growth except for nitrogen (N). Residual cow manure with and without split application gave significantly highest rice tiller number and grain fresh and dry weight compared to the other treatments. Nitrogen uptake in grain and K uptake in straw from the cow manure residue was significantly different from the composted residue. Phosphorus (P) uptake in straw and grain yield of all treatments was not significantly different, relating to high amounts of soil available P. Total zinc (Zn) uptake from residual cow manure soil was also highest. Soil pH after harvesting decreased slightly and total and available P in the control (no organic fertilizer application) were lower than residual organic fertilizer treatments. Exchangeable K and extractable sodium (Na) of residual cow manure were highest in soil after harvesting. Residual cow manure gave high level of K which increased rice growth and yield but also increased accumulation of non-essential elements such as sodium (Na). Results suggested that organic fertilizers produced higher residual nutrients, except N, which were sufficient for rice growth and yield in the next cropping. Residual cow manure gave higher exchangeable K which had a positive effect on rice growth but increased Na accumulation in the soil.
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    Release of various elements from organic fertilizers incubated in organic and non-organic paddy soils at various time periods
    (2019-01-01)
    Surin, Patcharin
    ;
    Supsuan, Phasini
    ;
    Yampracha, Sukunya
    Organic fertilizers often contain numerous elements beside nitrogen (N) such as phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sodium (Na). In general, the application rates of organic fertilizer are based on N requirement which could result in extra amount of other elements i. e. P and Na which could negatively impact on environment. This study aimed to investigate the release of P, K, Ca, Mg, and Na using a batch technique from three organic fertilizers (e. g. cow manure, compost and sunn hemp) incubated in two paddy soils at various time periods (e.g. 0, 3, 5, 7, 14, 21, 28, 42, 56, 70, 98 and 120 days). A 2×4 factorial in completely randomized experimental design with three replications was employed. A factor A was type of paddy field (an organic paddy field (SO), and non-organic paddy field (SC)) and a factor B was four different organic fertilizers application type (control, cow manure compost and sunn hemp). Soil samples were collected to analyze soil pH, electrical conductivity, available P (Bray II), exchangeable K, Ca, and Mg and extractable Na at the end of each incubation time period. Results showed that the incubation time period did not play a role on the release of P, K, Ca, Mg and Na in soils. Release of P, K, Ca, Mg, and Na in SC was higher than SO. Release of P, K, and Na were highest in cow manure, while compost gave higher release of Ca and Mg. Electrical conductivity did not exceed safety levels with all treatments less than 0.50 mS/cm.