Yampracha, Sukunya

Preferred name

Yampracha, Sukunya

Alternative Name

Yampracha, S.

Main Affiliation

School of Agricultural Technology

sukunya.ya@kmitl.ac.th

Now showing 1 - 10 of 14

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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
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Supsuan, Phasini
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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.
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Nitrogen requirements of cassava in selected soils of Thailand
(2013-08-20)
Kaweewong, Jakchaiwat
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Kongkeawa, Thanuchai
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Tawornprek, Saowanuch
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Yampracha, Sukunya
;
Yost, Russell
Cassava (Manihot esculenta) is one of the most important export crops in Thailand, yet the nitrogen requirement is unknown and not considered by growers and producers. Cassava requirements for N were determined in field experiments during a period of four years and four sites on the Satuk (Suk), Don Chedi (Dc), Pak Chong (Pc), and Ban Beung (BBg) soil series in Lopburi, Supanburi, Nakhon Ratchasima, and Chonburi sites, respectively. The fertilizer treatment structure comprised 0, 62.5, 125, 187.5, 250 and 312.5 kgNha -1 as urea. At each site cassava was harvested at nine months and yield parameters and the minimum datasets were taken. The fertilizer rate which resulted in maximum yield ranged from 187.5 kgNha -1 in Supanburi and Chonburi (fresh weight yield of 47,500 and 30,000 kg ha-1 respectively) to 250 kgNha-1 in Lopburi and Nakhon Ratchasima (fresh weight yield of 64,100 and 46,700 kg ha-1 respectively). Yield appeared to decrease at the higher, 312 kg ha -1, at Supanburi and Lopburi, and 250 kg ha-1 (Chonburi) fertilizer N rates. Net revenue was 70.4 and 72.9% higher than where no N was applied at Lopburi and Nakhon Ratchasima sites. Net revenue at the Supanburi and Chonburi sites were 53.8 and 211.0% higher than that where no N was applied. This study suggests that at all sites improved cassava production and net revenue could be obtained with the judicious application of higher quantities of N. The results provide needed guidance to nitrogen fertilization of the important industrial crop cassava in Thailand.
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Limiting rice and sugarcane residue burning in Thailand: Current status, challenges and strategies
(2020-12-15)
Kumar, Ipsita
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Bandaru, Varaprasad
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Yampracha, Sukunya
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Sun, Laixiang
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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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Effects of organic fertilizer application on the transformation of nitrogen in paddy soil
(2018-12-01)
Supsuan, P.
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Surin, P.
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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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Effects of interaction between nitrogen and potassium on the growth and yield of cassava
(2018-12-01)
Thummanatsakun, V.
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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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Application of Geo-CropSim framework for rainfed sugarcane yield assessment in Thailand
(2022-03-28)
Bandaru, Varaprasad
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Chirumamilla, Pallavi
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Skakun, Sergii
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Lasko, Kristofer
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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.
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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.
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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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Cassava nitrogen requirements in thailand and crop simulation model predictions
(2013-05-01)
Kaweewong, Jakchaiwat
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Tawornpruek, Saowanuch
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Yampracha, Sukunya
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Yost, Russell
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Kongton, Sahaschai
While cassava is an important crop in diverse regions of Thailand, little information is available to compare sites, select planting dates, and determine nitrogen (N) requirements. In recent years, the Decision Support System for Agrotechnology Transfer (DSSAT) has been used to develop this information. In order to use DSSAT, the cassava model, namely, CSM-CSCRP-Cassava, needs to be calibrated and validated. A cassava response to nitrogen study was conducted in Thailand during the 2011-2012 growing season. The data were also utilized to calibrate the DSSAT cassava model on cultivar Kasetsart 50. The model could be calibrated to predict the first branching date at 116 days, when it actually occurred at 117 days after planting. The overall average top dry weight and dry root yield were 7.39 and 15.69 t [BULLET OPERATOR] ha, which were predicted with a root mean square error of 0.496 and 0.702, respectively. Maximum leaf area index, leaf N (%), and harvested root N (%) were also adequately simulated. Validation experiments were conducted at the diverse Lopburi, Supanburi, and Chonburi sites. Top dry weight and dry root yield were predicted with indexes of agreement of 0.86 and 0.95 in Lopburi, 0.82 and 0.95 in Supanburi, and 0.83 and 0.55 in Chonburi. Nitrogen requirements for maximum yield were overpredicted by the model, indicating additional work is needed to account for negative effects of excessive N. Effects of regional weather conditions and soil types appeared to be adequately predicted by the calibrated model. Improved planting dates were suggested with the calibrated model. Copyright © 2013 by Lippincott Williams & Wilkins.
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Effects of different organic fertilizers on residual nutrients, rice growth and yield
(2020-01-01)
Surin, P.
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Chomngam, K.
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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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Yampracha, Sukunya

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