Soil characteristics of rice fields in several regions in Indonesia

The soil of rice fields in Grobogan Regency, Cntral Java Province comprised a clay texture (80%) and was slightly alkaline (pH 7.64). Both P and K nutrients extracted with 25% HCl were relatively high, base cations were dominated by Ca, while Mg, K, and Na levels ranged from moderate to low. The saturation of the Ca nutrient in the soil was 65.75%, while Mg, K, and Na reached 2.92%, 0.32%, and 0.56% respectively. The CEC of the soil was high, and the base saturation was extremely high. Similarly, the soil rice fields found in Pandeglang Regency, West Java was neutral (pH 6.4) with a clay texture (51%). In neutral to alkaline soil conditions, some nutrients were available at higher levels, such as basic cations including K, Ca, and Mg. The C-organic and total N content were found at low levels of 1.69 and 0.12%, respectively. The cation content in the soil detected at quite high levels was Mg, while K was low and Ca was high. Additionally, the soil samples had high CEC and extremely high base saturation. The soil of rice fields in the Sukadana, Lampung Province location appeared slightly acidic (pH 4.63) and comprised a sandy clay loam texture, leading to a lower content of K, Ca, Mg, C-organic, and total N, along with high potential P and available P nutrient. Meanwhile, potential K and exchangeable K were low, along with low levels of soil CEC and base saturation.

爪哇省中部格罗博根摄政区（Grobogan Regency）的稻田土壤以黏粒质地为主（占比80%），呈微碱性（pH值7.64）。采用25%盐酸提取的磷（P）与钾（K）养分含量均相对较高，盐基阳离子以钙（Ca）为绝对优势组分，镁（Mg）、钾（K）及钠（Na）含量处于中低水平。土壤钙养分饱和度为65.75%，镁、钾、钠的养分饱和度分别为2.92%、0.32%与0.56%。该土壤阳离子交换量（CEC）较高，盐基饱和度极高。西爪哇省庞岸达兰摄政区（Pandeglang Regency）的稻田土壤呈中性（pH值6.4），黏粒质地占比51%。在中性至碱性土壤环境中，部分养分含量处于较高水平，包括钾、钙、镁等盐基阳离子。土壤有机碳（C-organic）与全氮（total N）含量较低，分别为1.69%和0.12%。该土壤中阳离子含量较高的组分为镁，钾含量偏低，钙含量较高。此外，该土壤同样具备较高的阳离子交换量（CEC）与极高的盐基饱和度。楠榜省苏卡达纳（Sukadana, Lampung Province）的稻田土壤呈微酸性（pH值4.63），质地为砂质黏壤土，其钾（K）、钙（Ca）、镁（Mg）、有机碳及全氮含量均较低，但潜在态磷（potential P）与有效磷（available P）养分含量较高。同时，该区域土壤的潜在态钾（potential K）与交换性钾（exchangeable K）含量偏低，阳离子交换量（CEC）与盐基饱和度均处于较低水平。