Evaluation of Agricultural Resources in the Red River Delta

在越南农业科学研究所（河内，越南）的试验田进行了为期3年的一系列试验，以建立水稻可得产量估算模型。定量分析了洪涝灾害对红河三角洲3个主要水稻品种的影响，并将其纳入模型。此外，移植休克的影响也被纳入模型。利用农民田间实测数据对模型进行了初步验证，结果表明该模型对产量估算具有一定的适用性。为了解“Doi Moi”后土地利用、农业技术和资源投入以及农产品流动的变化，对南河1号灌溉计划218个合作社进行了19个主要主题、近1000个项目的问卷调查。虽然收集的数据量很大，但尚未完成全面的分析，但结果表明，该地区合作社的土地利用已明显多样化。对Coc Thanh合作社种植制度结果的分析表明，该合作社的种植制度得到了显著加强。为评价水土资源利用效率，对南河1号灌溉方案的水养分循环进行了分析。灌排水中氮、磷含量在雨季均有增加的趋势。氮的含量远低于预期。在Coc Thanh合作社，灌溉和排水之间的磷浓度差异明显，Coc Thanh合作社种植地的土壤分析表明，排水磷的一部分似乎来自菜地。综合以上结果，红河三角洲农业生产系统呈现集约化和多样化特征，农业资源得到了有效利用。营养物质向外部环境的流出量较低，说明系统本身是健全的。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