水稻施氮模型辨识及应用

Model for Applying Fertilizer in Rice Planting

中文摘要

      本文采用递推最小二乘辨识方法，建立高产水稻施氮数学模型，通过实践证明，按这模型制成的水稻施氮计算器指导水稻种植，在中产地力使用，亩产能稳产千斤左右，比习惯经验施肥法，增产10~15%，节省化肥25~35%，减少病虫害30~40%，降低成本约30%。

英文摘要

      This paper proposed a model for applying fertilizer in rice planting. In this model the quantity of fertilizer required to be applied to a unit area of paddy field is linearly related with the reproduction period, the A/B value and the seeding density. The associate parameters were estimated by using the least squares method based on 1000 sample data. By entering to a specially designed hand-held calculator the observed data of reproduction period, the A/B value and the seedling density in a unit area of a specific field, the quantity of fertilizer required to be applied to that area of field can be determined readily. Reports from many places in the country indicated that when applying fertilizer in accordance with the model, the rice production in a crop can be kept around 1000 jin per mu on a moderately rich land. In comparing with the cultivation by old experience, the production was raised by 10-15% and the consumption of fertilizer was reduced by 25%, along with a substantial decrease of plant disease of plant disease and insect pests. The total cost was brought down about 30%.