Evaluation of Agricultural Resources in the Red River Delta

在越南河内的越南农业科学研究所的试验田进行了为期3年的一系列试验，以构建水稻可获得产量的估算模型。将洪涝灾害对红河三角洲3个主要水稻品种的影响量化，并纳入模型。此外，模型中还考虑了移植物休克的影响。利用农户田间数据对模型进行了初步验证，结果表明该模型在产量估算中的适用性。为弄清Doi Moi后土地利用、农业技术和资源投入的变化以及农产品的流动情况，对南下1号灌区的218个合作社进行了19个主体、近1000个项目的问卷调查。收集的数据量巨大，充分的分析尚未完成，但结果表明，该地区的合作社土地利用多样化，S…更明显的系统。通过对Coc Thanh合作社种植制度效果的分析表明，该合作社的耕作制度有了明显的集约化，针对该合作社的水土资源利用效率评价，对南哈一号灌溉方案进行了水分和养分循环分析。灌排水中氮、磷含量在雨季均有增加的趋势。氮素的数量远远低于预期。在Coc Thanh合作社，灌溉和排水的磷浓度存在明显的差异，Coc Thanh合作社种植地的土壤分析表明，部分排水磷似乎来自菜地，综合以上结果，红河三角洲的农业生产系统具有集约化和多样化的特点，表明农业资源得到了高效利用。营养物质外流到外部环境的水平较低，表明系统本身是健全的。较少

A series of experiments were carried out at experimental fields of Vietnam Agricultural Science Institute (Hanoi, Vietnam) for 3 years, in order to construct a model to estimate rice attainable yield. The effect of flooding on 3 main rice varieties in the Red River Delta was quantified and incorporated into the model. In addition, the effects of transplanting shock was also incorporated into the model. The results of preliminary validation of the model using data obtained at farmers' fields suggest the applicability of the model for the yield estimation.To clarify the changes of land use, agricultural technologies and resource input, and the movement of agricultural product after Doi Moi, questioner survey with 19 main subjects and nearly 1,000 items was carried out on all the 218 cooperatives in Nam Ha 1 Irrigation Scheme. Amount of collected data were enormous and the full analysis was not completed yet, but the results showed that cooperatives in the area have diversified land use s … More ystems pronouncedly. The analysis of the results of cropping systems in the Coc Thanh Cooperative suggested that cultivation systems in that cooperative is remarkably intensified.Aiming at the evaluation of the utilization efficiency of water and soil resources, water and nutrient cycle of Nam Ha 1 Irrigation scheme was analyzed. In both irrigation and drainage water, the contents of nitrogen and phosphorus had a tendency to increase during the rainy season. The amount of nitrogen was much lower than expected. At the Coc Thanh Cooperative, clear differences of phosphorus concentration water were observed between irrigation and drainage, and the soil analysis of planting fields of Coc Thanh Cooperative suggested that some portions of drained phosphorus seemed to be from vegetable fields.Considering the above results, the agricultural production systems in the Red River Delta is characterized by the intensification and diversification and it is shown that the agricultural resources are utilized efficiently. The outflow of nutrient to outer environment was at low level, suggesting the soundness of the system itself. Less