红小豆主要增产因素正交试验结果

按L16(4~5)正交裹设计,对影响红小豆产量的主要因素——密度、氮肥、磷肥、播期进行了研究。结果表明,播期、磷肥的增产效果达极显著水平,密度、氮肥达显著水平。最佳播期6月15～25日,最佳密度亩保苗7～8千株。在中等肥力土壤上磷素(P_2O_5)亩用量不宜超过6.6kg,氮素不宜超过3kg。天津地区1988～1990年示范推广面积6万多亩,增产幅度30～50％。

The Results of Orthogonal Experiment on Main Yield-increasing Factors for Red Bean

The main yield-influencing factors for red bean, such as density, N fertilizer, P fertilizer, and sowing time, were studied on the Ll6 (45) orthogonal table design. Results showed that the yield-increasing effects of sowing time and P fertilizer appl cation were highly significant, while those of density and N fertilizer application were significant. The optimum sowing time ranged from the 15th to 25th of June and the optimum density was 7 000 -8 000 seedlings per mu. The amount of P fertilizer application should not exceed 6.6 kg per mu while the N application should not exceed 3 kg per mu, In Tianjin suburbs, from 1988 to 1990, demonstration and extension of the above results benefited a total of 60 000 mu of land and yield was increased by 30-50%.