The effects on soil properties were studied following sugarcane burning during harvesting based on the analysis of soil properties and the number of microorganisms. The soil bacterial community structure was observed using metagenomics. It was found that burned sugarcane harvesting reduced the soil moisture and total nitrogen contents and decreased the numbers of bacterial fungi and actinomycetes. Furthermore, there were decreased numbers of nitrogen-fixing and phosphate-solubilizing bacteria beneficial to plants. The Firmicutes phylum (46.79) was found abundantly in the soil after burned sugarcane harvest. Paenibacillus (34.20) and Bacillus (9.19) were dominant at the genus level. On the other hand, in the soil after unburned sugarcane harvest, the diversity index was higher than that after burned sugarcane harvest. Actinobacteria (25.92) dominated at the phylum level, and Candidatus koribacter, Gaiella, Pseudolabrys, and Sphingomonas dominated at the genus level in the unburned plots. Changing the bacterial community resulted in a change in correlation with soil properties. Therefore, the impacts from burned sugarcane harvesting should be realized, specifically that soil physiochemical and biological properties are degraded (except for some groups of bacteria) along with their functions in the soil.

Information to aid the selection of suitable cultivated areas remains meager for mung bean, despite it being a socio-economically important legume crop in Thailand. Hence, a user-friendly soil assessment tool is required to help properly choose planting areas. We aimed to provide a decision support system for mung bean cultivation in central Thailand. Soil suitability classes were performed using relevant factors and data essential for mung bean cultivation in 22 provinces in central Thailand. A decision support system was developed as soil map and mobile phone application using data based on soil suitability classes. Information of mung bean growth and yield grown in experimental fields with different soil suitability classes was used for preliminary validation. The main areas were very suitable (S1) and moderately suitable (S3) for mung bean plantation, accounting for 1,319,841 and 1,327,804 ha, respectively. The number of pods per plant and yield per plant of mung bean were higher in S1 areas (12.83–16.65 pods per plant and 8.35–12.43 g/plant, respectively) than in S3 areas. The mung bean yield was also greater in S1 areas (1613.8–2158.7 kg/ha) than in S3 areas (735.8–1138.6 kg/ha). The findings suggest the possibility of using developed decision support system.

This study contributed to the understanding of the effect of sea level rise on soil properties in the agricultural area during the dry season and the providing of more detailed information needed to improve agricultural practices in the area. Five study sites, which located in Nonthaburi province, were selected according to the disparate distance from Chao Phraya River, comprising tropical fruit orchard (location 1 to 4) and paddy field (location 5). Soil morphology was recorded by the genetic horizon and soil samples were collected at depth of 0-15, 15-30, 30-60, 60-90 and 90-120 cm in March 2018 to analyze soil properties involving to salt affected soils, including Electrical Conductivity (EC_e), Sodium Adsorption Ratio (SAR), and soil moisture. Moreover, the correlation between their soil properties was also examined by using SPSS Statistics version 22.0 at p-value < 0.05. The result divulged that all soils are deep, poorly drained, and low development. Soil textures are clayey. EC_e and SAR of these soils ranged from 0.27-4.38 dS m⁻¹ and 8.54-37.23, accordingly. The trend of soil moisture from 0-90 cm usually increased as the following depth except location 5. The relationship between EC_e and SAR of these soils at 0-15, 15-30, 30-60, 60-90 and 90-120 cm revealed highly significant correlation, namely, the correlation coefficient (r) was 0.93, 0.94, 0.72, 0.77 and 0.86, respectively. These results suggest that sea level rise in the dry season influences on some properties of soil.

Monitoring the Effects of Sea Level Rise on some Soil Properties Related to Salt Affected Soils in Agricultural Areas of Lower Central Plain, Thailand

Land use practices are a key driver of soil nitrogen (N) dynamics, yet their influence on N accumulation within distinct soil organic matter (SOM) fractions remains insufficiently understood. This study aimed to elucidate the responses of N accrual in different SOM fractions to contrasting land uses. To achieve this purpose, soil samples were collected from seven representative land uses: forest, pasture, corn plantation, sugarcane plantation, cassava plantation, orchard, and abandoned land. Subsequently, soil samples were fractionated into free particulate SOM (fSOM), occluded light SOM (oSOM), weakly bound form SOM (wSOM), and strongly bound form SOM (sSOM) fractions, and N contents were quantified for each fraction. The results showed pronounced land use effects on both the magnitude and distribution of N among SOM fractions. The forest land use consistently promoted greater N accumulation in fSOM (0.15 g N kg⁻¹ soil), oSOM (0.14 g N kg⁻¹ soil), and wSOM fractions (0.29 g N kg⁻¹ soil), reflecting high organic inputs and low disturbance intensity. The pasture land use exhibited the highest N accumulation in the sSOM fraction (1.01 g N kg⁻¹ soil), indicating enhanced stabilization of N through strong organo-mineral associations. Intensively managed croplands and abandoned land generally displayed lower N storage across SOM fractions. Overall, these findings highlight the critical role of land use in regulating N partitioning and stabilization within SOM fractions and underscore the importance of low-disturbance, perennial vegetation systems for improving long-term soil N retention.

Evaluating Genetic Coefficients of KUML4 Mung Bean Variety for a Crop Simulation Model