Developing an agriculture system with built-in water purifying mechanism in urban peripheries of Southeast Asian large cities

本研究的目的是从农业经济学和社会科学的角度定量地阐明农业活动对环境负荷的实际状况，并通过确定氮/磷肥的动态，为在热带亚洲大都市区的城市周边建设可持续农业收集基础数据。我们进行了初步的调查，以选择样本领域，为这项研究在纳贡柴西盆地覆盖区Nontabri，纳贡柴西，和Suphanburi，并选择了邦兰县和松皮农县作为候选地区。2003年和2004年，对样地农户进行了耕作记录，并开始每月和每半年进行一次土壤和水样采样，并对样地的土壤和水样进行了分析。 ...更多信息 不同深度的早期土壤样本。这些调查表明，几乎所有作物和种植模式的经济回报都很高。研究还发现，农民根据以前种植的作物以及作物是否被淹没来调整肥料和堆肥的数量。对于所有作物和所有作物季节，杀虫剂的成本高于杀菌剂的成本。雇用劳工从事诸如整地、播种、间伐、收割和包装等农业活动。8月和3月的土壤数据显示，无机物含量高，几乎所有领域和河流的底泥。特别是，8月份的样本比3月份的样本具有更高的值。4月至8月期间蔬菜种植的集约化管理被理解为获得这种结果的原因。研究还表明，研究区农民为保持农田土壤状况良好而采取的蔬菜种植淹没措施导致了河流和运河水中离子含量的高水平，本研究成功地确定了导致高环境负荷的农业活动。提出了一些应对这种情况的措施，但仍有许多余地供进一步研究。少

This study aims to collect basic data for building sustainable agriculture in urban peripheries of large metropolitan areas in Tropical Asia through clarifying quantitatively the actual status of environment load due to agricultural activities from the agronomic as well as social scientific points of view, and through identifying the dynamics of nitrogen/phosphorus fertilizers.In August 2002, we conducted preliminary surveys to select sample fields for this study in the basin of the Nakonchaisy covering the Districts of Nontabri, Nakonchaisy, and Suphanburi, and selected the county of Banglaen and Songpinon as the candidate areas. Also decided were four cultivation patterns to be studied ; (1)rice cultivation in paddy, (2)vegetable cultivation in polder, (3)water convolvulus cultivation in paddy and (4)water convolvulus cultivation in river.In 2003 and 2004, for the sample fields, farmers kept farming records, and sampling was commenced for monthly soil and water samples and for half-y … More early soil samples from different depth. These surveys indicated that the economic returns were high for almost all crops and cultivation patterns. It was also found that farmers adjust the quantity of fertilizers and compost according to which crop was previously grown and whether or not crops were inundated. For all crops and all crop seasons, the cost of insecticides was more than the cost of fungicides. Hired labor was employed for such farming activities as land preparation, seeding, thinning, harvesting and packing. Soil data in August and March revealed that inorganic contents were high for nearly all fields and bottom sludge of the river. In particular, August samples had higher values than March samples. The intensive management of vegetable cultivation between April and August was understood as the reason why such results were obtained. Our study also made it clear that the inundation practice in vegetable cultivation, which farmers in the study area adopted to maintain the soil condition of their fields in good conditions, resulted in the high contents of ion in the water of rivers and canals.This study succeeded to identify farming activities that result in high environment load. Some measures to counteract against such situations were proposed, but much room was left for further research. Less