Yampracha, Sukunya

Preferred name

Yampracha, Sukunya

Alternative Name

Yampracha, S.

Main Affiliation

School of Agricultural Technology

sukunya.ya@kmitl.ac.th

Now showing 1 - 7 of 7

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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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Mitigation of soil salinity by addition of different rice straw biochar doses in salt-affected acid soil
(2024-09-01)
Shwe, Kyi Kyi
;
Chaopayao, Nantanat
;
Yampracha, Sukunya
The current study was carried out to evaluate the effect of rice straw biochar amendment and to identify the appropriate dose of biochar application to reduce soil acidity, salinity, toxicity, and sodicity in salt-affected acid soils. The rice straw biochar at 4 different rates of 0%, (control) 1%, 3%, and 5% (w/w) was mixed with 6 salt-affected acid soils: S1 (non-saline), S2 and S3 (low saline), and S4, S5, and S6 (moderate saline). The mixture was continuously shaken in distilled water for 7 days. The biochar application significantly increased soil pH and saturated electrical conductivity (ECe) with an increasing biochar application rate compared with the control. Significant decreases in sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP) values below the critical level of sodicity were observed above the biochar application rate of 1%. Soluble chloride (Cl-) and soluble and exchangeable sodium (Na+) were significantly reduced above the biochar application rate of 1%. The biochar application (≥ 1%) led to a significant increase in soluble and exchangeable potassium (K+) and declines in soluble and exchangeable calcium (Ca2+) and magnesium (Mg2+). This study concluded that the biochar application rate of 1% was suitable for reducing soil acidity to a safe level for rice plants. The rice straw biochar application improved soil toxicity and sodicity by reducing soluble Cl- and soluble and exchangeable Na+, decreasing SAR and ESP. The biochar application also increased available K+, essential for rice plant growth and development in salt-affected soils.
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Limiting rice and sugarcane residue burning in Thailand: Current status, challenges and strategies
(2020-12-15)
Kumar, Ipsita
;
Bandaru, Varaprasad
;
Yampracha, Sukunya
;
Sun, Laixiang
;
Fungtammasan, Bundit
As population and consumption grow, so does crop production and its residue. Crop residue is traditionally burned in developing countries, which impacts environment, economy, society and health. Thailand faces similar challenges as it is among the largest producers of rice paddy and sugarcane in the world with 83% of its total burnt residue coming from these crops. To address this problem, the Government of Thailand has implemented some policies (e.g. Alternative Energy Development Plan (AEDP) and zero burning policy for sugarcane) targeting both, the use of residue, and the practice of burning. While these policies appear to control residue burning to some extent, there are still challenges, especially for poorer farmers, who rely on manual harvesting practices. The paper looks into the current status of rice and sugarcane residue burning, its impacts on the environment, existing policies, current challenges, and future solutions through sustainable management practices. To achieve reduction in residue burning, the best possible solution is to use residue for alternative purposes. Some sustainable management practices include use of residue for energy production, green harvesting to improve soil nutrients, biochar production and composting. Thailand can also learn from solutions implemented in other countries, to reduce some of the impacts of crop residue burning.
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Application of Geo-CropSim framework for rainfed sugarcane yield assessment in Thailand
(2022-03-28)
Bandaru, Varaprasad
;
Chirumamilla, Pallavi
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Skakun, Sergii
;
Lasko, Kristofer
;
Yampracha, Sukunya
The adoption of hybrid approaches that use remote sensing datasets in crop simulation models for yield assessment at spatial scale has been constrained by lack of crop type maps and high-resolution remote sensing datasets. To address that, Geo-CropSim, a geospatial crop simulation modeling framework, was developed to produce high quality remote sensing products and use them in Environmental Policy Integrated Climate (EPIC) model to estimate crop yields at various spatial scales. In this study, Geo-CropSim was implemented within the Chaiyaphum province, Thailand to estimate sugarcane yields under rainfed conditions for the 2018 at 500-m resolution. Results showed that the use of Harmonized Landsat Sentinel (HLS) data along with sentinel-1 SAR data allowed to produce a land cover map with an overall accuracy of 96%. Similarly, utilization of HLS data helped to estimate emergence dates and seasonal leaf area index capturing spatial differences driven by differences in climatic conditions. Geo-CropSim yield estimates ranged from 55-98 Mg/ha and showed a typical north-south gradient of decreased yields reflecting lower rainfall and soil quality in the south. Simulated yields showed good a correlation with district and field observed yields with RMSE values of 11.7 Mg/ha and 15.75 Mg/ha, respectively. Overall, simulated yields had uncertainty indicated by mean absolute percentage error (MAPE), less than 20% which is considered as acceptable accuracy for regional yield assessment. Even though it is required to test the framework's performance for long-term consistency over multiple regions, this study demonstrated Geo-CropSim's potential to produce sugarcane yields under rainfed conditions with reasonable accuracy.
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Changes in soil properties of Bangkok soil series from rice stubble burning
(2022-03-01)
Preesong, J.
;
Yampracha, S.
Rice stubble burning, a very improper crop residue management, causes air pollution and soil degradation. Nevertheless, it is typically practiced by today's Thai farmers. The results indicated that the soils in the four plots were all clayey soil, which was an established characteristic of Bangkok soil series. The results showed higher content of soil organic carbon, higher contents of total nitrogen and total sulfur, as well as higher cation exchange capacity of the soil managed with no rice stubble burning at the depth of 0-15 cm. These differences were verified to be the effect of stubble burning on the topsoil because there were no differences detected in the subsoil, not any other factors. Nevertheless, the soil pH and exchangeable Ca of the soil managed by rice stubble burning were higher. Since the level of soil organic carbon was the strongest indicator of soil fertility, it would be communicated to the farmers that managing crop residue by stubble burning would make the soil less fertile than no stubble burning.
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Comparative study of nitrogen release from compound fertilizers in silty loam and sandy loam soils
(2025-11-01)
Preesong, J.
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Phromnak, P.
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Paenklang, F.
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Thammanatsakun, V.
;
Yampracha, S.
Most Thai farmers cultivate field crops on coarse-textured soils that are inherently low in fertility and highly susceptible to nutrient leaching, resulting in low nitrogen use efficiency. The results indicated that the Hin Kong (Hk) soil series exhibited greater ammonium-N and urea-N release than the Chanthuk (Cu) soil series, reaching 624 and 54.4 mg N kg-1, respectively. In contrast, the Cu soil series showed higher nitrate-N release, with 364 mg N kg-1. Among the fertilizer formulations, 15-7-18 produced the highest ammonium-N, urea-N, and available nitrogen release, although these values were not significantly different from those of the 15-5-20 formulation. Conversely, the 15-5-20 formulation generated the highest nitrate-N release (536 mg N kg-1), but its ammonium-N and available N release remained statistically comparable to the 15-7-18 formulation. The 15-7-18 fertilizer consistently promoted early-stage ammonium accumulation, reflecting its relatively ammonium-based composition, whereas the 15-5-20 formulation favoured rapid nitrate build-up in the Cu soil. The 16-8-8 formulation exhibited a more gradual release pattern in both soils, maintaining available N at later stages and suggesting slower transformation and solubilization rates compared with the other formulations. These findings indicate that nitrogen release dynamics are jointly governed by fertilizer formulation and soil properties—including not only soil texture but also organic matter content, cation exchange capacity, and soil acidity. Temporal patterns further revealed an initial rapid nitrogen release followed by stabilization, reflecting the combined effects of soil physical structure, chemical characteristics, microbial activity, and fertilizer traits. Selecting an appropriate fertilizer formulation is therefore essential for improving nitrogen use efficiency in coarse-textured soils.
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Assessment of water quality variation for agriculture in Bang Pakong River of Thailand
(2022-09-01)
Shwe, K. K.
;
Huaihongthong, S.
;
Yampracha, S.
The quality of water from the river was carried out from November, 2021 to April, 2022. The water samples were collected from 13 sampling points and analyzed pH, electricity conductivity (EC), salinity, calcium (Ca2+), magnesium (Mg2+), sodium (Na+), chloride (Cl-), sulphate (SO<inf>4</inf>2-) and sodium adsorption ratio (SAR). The seawater mixing ratio was calculated using chloride concentration from the river and sea. The maximum pH value (7.56) was observed in February and the minimum value (6.53) was occurred in December among the collection months. The EC and salinity were the highest in February. The highest concentration of cation in water sample was Na+and the lowest value of cation was Ca2+. The concentration of Mg2+was higher than that of Ca2+from February to April. The sequence of major anions in water were Cl -> SO<inf>4</inf>2-. All parameters were higher in February compared to other collection months. Additionally, the highest seawater mixing ratio was observed in February (25.40%) followed by March (3.87%) and April (1.27%). The acceptable limits of irrigation water were EC (<0.7 mS cm-1), SAR (< 10) and Cl-(<10 meq L-1). The EC (13.90 mS cm-1), SAR (22.81) and Cl-(117.00 meq L-1) values were high in the river water was unsuitable for irrigation in February, which caused many problems to soil and plants. Therefore, it was concluded that the properties of water in Bang Pakong River were changed in every month depend on precipitation and freshwater flow in this region. Besides, presence of high salinity and sodicity of irrigation water other than rainwater could deteriorate the soil properties of valuable agricultural land as well as damaged the crop production. The results provided that the river water was suitable for irrigation in agricultural fields in specific month in order to increase agricultural production in this area.

Yampracha, Sukunya

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