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Author: search.filters.author.Surin, P.

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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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    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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